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Project 401(k)-style savings, salary-based deferrals and tiered employer matching, with optional frozen 2026 caps and withdrawal estimates.

Estimate the future value of an initial balance and equal recurring contributions under a constant-return annuity model.

Estimate a fixed withdrawal from savings or how long a balance lasts under a constant return and monthly drawdown scenario.

Explore IRA growth and withdrawals, compare traditional and Roth savings from equal pretax resources, or estimate a 2026 contribution ceiling.

Compare pension present values, lump sums and single-life or joint-survivor payment streams using explicit timing and lifetime assumptions.

Model retirement savings, salary-based contributions and inflation-linked spending, with a year-by-year withdrawal scenario.

Estimate owner RMDs with distribution-year rules, applicable lifetime tables and return-based projections, within the stated account scope.

Compare Roth, traditional and taxable scenarios using qualified-distribution assumptions, equal pretax resources and a separate 2026 ceiling.

Compare Social Security claiming ages, full-retirement-age cohorts and two benefit streams under shared COLA and discount assumptions.

Build a loan amortization schedule and compare monthly, annual or dated extra payments against an unchanged-payment baseline.

Estimate a loan's fee-inclusive borrowing rate by comparing net proceeds with scheduled payments and selected payment frequencies.

Estimate Canadian mortgage payments using nominal semiannual compounding, with ownership costs and optional extra principal payments.

Calculate debt-to-income ratio from gross income and debt payments entered as monthly totals or mixed annual and monthly lines.

Calculate down-payment cash, a purchase-price budget or a savings timeline while allowing for entered closing costs.

Estimate standard FHA fees, mortgage-insurance schedules and extra-payment payoff, or enter rates in a manual premium worksheet.

Estimate HELOC draw-period interest, later repayment payments and home-equity borrowing capacity under a constant-rate scenario.

Estimate a home-equity loan payment and available borrowing capacity from property value, existing debt and a chosen combined LTV limit.

Estimate a home-price budget from income and debt limits, or from an entered monthly housing payment allowance.

See how mortgage payments divide between principal and interest, and how extra payments change the balance and payoff schedule.

Estimate US fixed-rate mortgage payments and ownership costs, and compare monthly, annual or dated extra principal payments.

Compare UK repayment and interest-only mortgage estimates in pounds, including entered ownership costs and extra repayments.

Estimate mortgage payoff and interest, infer a remaining balance from loan history, or compare an accelerated biweekly scenario.

Explore mortgage, affordability, refinancing, and property investment calculators.

Compare refinancing payments, interest and simple break-even, or evaluate payments and remaining debt over the same holding period.

Estimate a monthly rent budget from gross income, a chosen spending percentage and the utilities you expect to pay.

Compare renting and buying through housing cash flows, refundable deposits, mortgage equity and a common investment-return assumption.

Estimate rental cash flow and returns, or model a holding period with growing expenses, mortgage payoff and sale proceeds.

Estimate VA purchase or refinance funding fees and payments, using the selected fee tier, financing choice and verified exemption assumptions.

Estimate a vehicle lease payment from cost, residual value and money factor, or work backward from a monthly payment budget.

Calculate auto-loan payments and price budgets with trade debt, rebates, fees and scoped US state tax treatment.

Compare a vehicle rebate with promotional financing, recalculating taxes, financed costs and total cash for each offer.

Compare arithmetic and geometric period returns, or estimate annual money-weighted return from dated deposits and receipts.

Calculate regular-coupon bond price or yield, including dated settlement, accrued interest and selectable day-count conventions.

Estimate CD-style deposit growth under a fixed rate, compounding schedule and optional tax assumptions, with a projected ending balance.

Project compound interest with regular deposits, compounding frequency, tax and inflation assumptions. Compare equivalent interest rates.

Solve time-value-of-money problems for present value, future value, payment, rate or periods, with explicit cash-flow conventions.

Estimate the future value of savings and recurring deposits, including separate monthly and annual contributions and assumed purchasing power.

Project compound interest with regular deposits, optional monthly and annual contribution streams, and entered tax and inflation assumptions.

Find the implied fixed annual loan rate from a principal balance, monthly payment and repayment term, excluding financing fees.

Explore investment targets, required contributions and assumed returns, including signed TVM and separate monthly and annual deposit scenarios.

Estimate periodic or dated internal rates of return, including recurring cash-flow scenarios and detected multiple solutions.

Project fund contributions and growth, compare entry loads and annual expenses, or estimate a single-lot redemption charge.

Calculate assets minus liabilities and track dated net-worth snapshots in your browser. See liquid assets, debt totals, and changes over time.

Estimate simple or discounted payback from entered periodic cash flows or an annual return stream with assumed growth.

Discount a future lump sum and regular payments to today's value, with payment-frequency and beginning-or-end timing options.

Calculate ROI and annualized return from a holding period or exact dates, or use dated cash flows for money-weighted return.

Estimate savings growth from an opening balance and regular deposits, including contribution timing, tax and inflation scenarios.

Calculate simple interest and total balance, or solve for missing principal, annual rate or time without compounding.

Estimate fixed monthly boat-loan payments, interest and payoff timing, including optional extra payments toward principal.

Calculate break-even units and sales revenue, target-profit volume, and your margin of safety using fixed costs, unit price, and variable costs.

Build a monthly budget from take-home totals or mixed-period gross-income lines, with pretax savings, assumed tax and debt payments.

Compare business-loan payment schedules and compounding frequencies, with optional extra principal and modeled upfront financing fees.

Forecast monthly business cash balances and runway with revenue growth, operating expenses, one-time movements, and a minimum cash buffer.

Project college costs and a chosen funded share, then estimate monthly savings with optional annual tax on investment interest.

Calculate flat or tiered sales commission, total compensation, or the sales and rate needed for a target commission.

Estimate payoff time or a target payment for a credit-card balance using a fixed rate and no new purchases.

Plan payoff across multiple credit cards using avalanche or snowball ordering, entered minimum payments and a monthly extra-payment budget.

Convert currencies using an entered rate, dated ECB reference rates, or broader reference and spot snapshots with source attribution.

Compare current debt obligations with a consolidation loan, including financed fees, the new payment and repayment-term effects.

Compare avalanche and snowball debt repayment schedules, with fixed minimum payments and extra cash rolled into remaining balances.

Compare book-depreciation schedules, including fiscal dates, partial-year conventions and an optional switch to straight-line expense.

Calculate sale price and savings, combine a percentage and fixed reduction, or recover the original price from a known pair.

Plan an emergency fund from essential monthly expenses, chosen coverage months, and existing savings. Calculate your gap and a monthly savings timeline.

Compare US purchasing power with versioned BLS CPI-U data, or explore future price changes using an inflation rate you choose.

Create an invoice or quotation with line items, discounts, tax, and payment terms. Add your branding and download a PDF without an account.

Calculate an asset-financing lease payment or implied rate from asset value, term and residual, with a separate vehicle-lease model.

Compare fixed loan payments, deferred balances and zero-coupon borrowing, with separate payment and compounding frequency options.

Calculate profit margin and markup, solve a target selling price, or explore simplified stock and currency margin requirements.

Find the payment for a fixed-rate loan or estimate payoff time from a monthly payment amount you choose.

Calculate payment fees and net receipts, or find the gross charge needed for a target net amount. Includes custom fees and a US Stripe preset.

Calculate percent-off savings and final prices, or combine two successive percentage discounts without simply adding them.

Estimate personal-loan payments, origination fees, monthly insurance and the resulting borrowing cash-flow cost.

Plan fixed-rate debt repayment by term or payment budget, with a schedule showing the balance, interest and final installment.

Calculate net price, sales tax, gross price or an implied tax rate from a selected pair of known values.

Estimate online selling profit after product costs, shipping, platform fees, processing, advertising, returns, and overhead. Includes a US Etsy example.

Model standard student-loan repayment or annual borrowing during school, with explicit delay-interest and capitalization choices.

Total recurring subscriptions, compare monthly and annual costs, and estimate savings from cancellations or annual-plan offers. Save your plan locally.

Calculate VAT, net or gross amounts, or an implied VAT rate from the values you already know.

Estimate a 2026 federal estate-tax scenario from asset and deduction lines, adjusted gifts, exclusion and entered credit assumptions.

Calculate freelance hourly and day rates, plus project quotes, from your income goal, expenses, tax reserve, time off, and billable hours.

Compare supported 2025 or 2026 federal filing scenarios and separate state/local assumptions, including income, deductions and credits.

Convert gross salary across hourly through annual pay periods, including quarterly pay, and compare unpaid-day adjustments.

Estimate annual take-home cash for 2025 or 2026, or calculate 2026 paycheck withholding with separate tax wage bases.

Estimate 2025 or 2026 US federal tax with combined income, deduction and credit scenarios, plus focused tax worksheets.

Understand adult BMI and why it cannot diagnose anorexia, assess an eating disorder or establish an underweight target.

Compare the 2026 Army waist-to-height threshold using recorded measurements, or explore the historical 2023 body-fat equation.

Calculate adult BMI or CDC BMI-for-age percentiles for ages 2 to under 20, with the screening limits of each method explained.

Estimate adult resting energy expenditure using the available equations, and convert food energy between kilocalories and kilojoules.

Estimate body-fat percentage using historical circumference equations or the age- and sex-adjusted BMI study model.

Estimate adult daily maintenance calories from body measurements and activity assumptions, with food-energy unit conversion.

Estimate activity calories using METs, selected Compendium activities or a distance-and-speed approximation, with gross and net energy shown.

Explore the adult BMI-based reference weight interval for a height, including the exclusive upper boundary and screening limitations.

Compare historical adult reference-weight equations or use CDC child BMI-for-age references without setting a personal target weight.

Compare lean-mass estimates from entered body fat, Boer, James, Hume or the pediatric Peters method, with equation-specific limits.

Estimate a one-repetition maximum from a submaximal lift using Epley, Brzycki and supported Lombardi comparisons.

Explore adult BMI screening categories from height and weight, with clear limits on what the result can say about individual health.

Calculate pace, speed, time and distance, review cumulative splits, or project a finish from the average pace so far.

Compare estimated maximum heart rates and target ranges, or use the talk test to check exercise intensity.

Explore a rough Widmark blood-alcohol estimate from one drink input or multiple beverages, with major safety limitations made explicit.

Estimate body surface area with eight named equations, age-specific branches and metric or US area units.

Explore body proportions and the 2020 revised FFIT fashion descriptors with their measurement limitations.

Estimate carbohydrate grams from a calorie target and percentage, or explore adult energy-based carbohydrate reference ranges.

Convert a selected share of daily calories into fat grams and compare adult energy-based fat-intake reference ranges.

Estimate eGFR with adult race-free CKD-EPI 2021 or pediatric bedside Schwartz equations, using creatinine and model-specific inputs.

Convert a daily energy target into protein, carbohydrate and fat grams, or explore adult reference ranges from body measurements.

Estimate daily protein grams from body weight and a chosen g/kg target, or compare adult energy-based protein reference ranges.

Estimate total daily energy expenditure by combining an adult resting-energy equation with your selected activity factor.

Estimate a possible fertile window from cycle history and explore menstrual, conception, ultrasound or IVF pregnancy-dating methods.

Estimate a due date from the last period, conception date, IVF transfer or ultrasound dating, using the selected method's inputs.

Estimate ovulation timing and a possible fertile window from cycle length and luteal-phase assumptions, without confirming ovulation.

Project a next-period date from menstrual history and assumed cycle length, with associated cycle estimates and their limitations.

Estimate pregnancy dates from menstrual history, conception, ultrasound, IVF transfer or a known due date, with dating assumptions explained.

Estimate conception timing from a known due date or other pregnancy-dating information, while keeping the uncertainty of dates explicit.

Compare pregnancy weight gain with BMI-specific singleton or twin reference guidance, without prescribing an exact week-by-week target.

Calculate areas of common plane shapes, including sectors and triangles from three sides, with independent input-unit options.

Find a circle's radius, diameter, circumference and area from any one of those measurements using consistent length units.

Calculate coordinate distance or spherical great-circle distance from decimal or degree-minute-second latitude and longitude.

Find a right triangle's hypotenuse from two perpendicular legs, or recover one leg from the hypotenuse and the other leg.

Solve a right triangle from supported pairs of known measurements, returning sides, angles, area and possible alternate solutions.

Find slope and a line equation from two points, or determine endpoints from a point, distance and direction.

Calculate total surface areas of common solids, including cap bases and hollow-cylinder surfaces, with the ellipsoid approximation disclosed.

Solve SSS, SAS, ASA or ambiguous SSA triangles, with angles, area and derived measurements such as altitudes, medians and radii.

Find volumes of common solids, including hollow cylinders, frustums and spherical caps, with selectable measurement units.

Calculate the mean of a number list and compare it with the median, range and other measures of the dataset's spread.

Estimate a confidence interval for a mean using Student t or normal z assumptions, sample size and standard deviation.

Find mean, median, mode and range from a dataset and compare what each measure reveals about its center and spread.

Generate arithmetic, geometric and Fibonacci sequences or find a selected term and series sum with explicit index conventions.

Find tail probabilities from z, t, chi-square or F statistics, with required degrees of freedom and normal inverse-probability options.

Count ordered selections and unordered groups of distinct objects without replacement, using permutation and combination formulas.

Explore event unions and intersections, solve independent-event constraints, model repeated trials or calculate normal probabilities.

Estimate a survey proportion's sample size or margin of error, with confidence, expected proportion and finite-population assumptions.

Calculate sample and population standard deviation and variance from a number list, with the different denominators explained.

Summarize a numeric dataset with measures of center, spread and distribution, including sample and population variance.

Standardize a value as a z-score, explore normal tail probabilities or recover a boundary from a known normal probability.

Calculate arithmetic expressions with parentheses and standard operation order, using explicit multiplication and readable results.

Work with exact integer operations, bounded high-precision decimals and mathematical expressions, choosing the mode suited to the numbers.

Perform exact binary integer arithmetic and convert signed integers between base 2 and decimal without floating-point conversion.

List the positive factors shared by all entered whole numbers and identify their greatest common factor.

Raise a real number to a positive, negative or fractional power within the supported real-number domain.

List the positive factors of an integer and its prime decomposition, with inputs capped to keep trial division responsive.

Add, subtract, multiply, divide, simplify and compare fractions, with mixed-number and decimal input support.

Find the greatest common factor of a set of whole numbers using the Euclidean greatest-common-divisor relationship.

Model exponential decay, solve for remaining or initial quantity and elapsed time, or convert half-life and decay constants.

Calculate exact hexadecimal integer operations and convert signed values between base 16 and decimal, using digits 0–9 and A–F.

Find the least common multiple of whole numbers and use it to identify a shared repeating interval or denominator.

Calculate logarithms in a valid positive base, or solve for a missing argument or base from a known logarithm.

Divide integers to find a quotient and remainder, or inspect digit-by-digit long-division steps for supported inputs.

Add, subtract, multiply, scale, transpose and raise matrices to integer powers, or calculate determinants and inverses up to 10 by 10.

Find a percentage, percentage change or difference, adjust a value, and reverse a change to recover the original amount.

Compare an observed value with a nonzero accepted value to calculate absolute percentage error and signed error.

Break a positive integer into prime factors and repeated powers, within the supported one-trillion input limit.

Solve quadratic equations, inspect the discriminant and find real or complex roots, with linear handling when the quadratic term is zero.

Generate random whole numbers or fixed-precision decimals within bounds, with unique-value and sorting options using exact sampling.

Simplify whole-number ratios, solve any missing proportion term, or enlarge and shrink both parts by a scale factor.

Find square roots, cube roots and other integer-index roots, including supported real odd roots of negative numbers.

Round decimal numbers by places or significant figures, or use a chosen increment and explicit halfway-value rule.

Evaluate mathematical expressions with powers, logarithms and trigonometric functions, using an explicit degree or radian setting.

Convert decimal numbers to scientific notation and perform supported arithmetic on coefficients and powers of ten.

Find calendar age in years, months and days, plus elapsed days between a birth date and a selected comparison date.

Add or subtract calendar intervals, compare dates, and count or move through business days using chosen workdays and holidays.

Count elapsed calendar or business days between dates, with an end-date option and custom working-day and holiday controls.

Find a date's weekday, day number within the year and ISO week, using Gregorian calendar and Monday-based ISO conventions.

Calculate work or activity hours between clock times, subtract a break and view decimal hours for same-day or overnight intervals.

Add and subtract durations, evaluate supported time expressions or shift a civil date and time by an entered duration.

Total dated or weekly shifts, unpaid breaks and estimated pay, with configurable overtime and clock-punch rounding.

Measure elapsed civil time between clock times or dated timestamps, with break subtraction and clear overnight assumptions.

Convert dates and times using named-zone daylight-saving rules or explicit fixed UTC offsets, with repeated-time handling.

Convert data units and estimate transfer time, website traffic or average bandwidth with explicit reporting periods and allowance formats.

Encode UTF-8 text as Base64 or decode Base64 locally in the browser, without treating the encoded output as encryption.

Calculate IPv4 or IPv6 subnet ranges from CIDR prefixes, or validate a contiguous IPv4 dotted mask and its address capacity.

Generate passwords locally with cryptographic randomness, chosen character classes and optional unique-character constraints.

Percent-encode or decode a UTF-8 URL component locally, keeping component encoding distinct from encrypting or validating a full URL.

Estimate a US bra starting size from underbust and bust measurements using a direct-underbust convention, with fit limits explained.

Split group expenses with multiple payers, equal or unequal shares, and exact rounded settlements. Find who owes whom for trips and shared bills.

Calculate the final exam score you need from your current grade, target grade, and final exam weight.

Estimate an 18-hole index from adjusted differentials, calculate a course handicap or derive a score differential from entered course data.

Calculate semester and cumulative GPA using course grades, credit hours, and your institution’s grading scale.

Calculate the future GPA needed to reach your cumulative GPA goal and compare scenarios for your remaining credits.

Calculate weighted or points-based grades, exclude ungraded work, and compare what-if scores.

Convert foot length to Mondopoint millimeters and an approximate US adult size using a stated allowance and sizing model.

Plan a bedtime or wake time from a chosen sleep duration, or explore illustrative cycle times with a sleep-onset allowance.

Calculate a tip from a chosen percentage and divide the bill plus tip evenly among a selected number of people.

Estimate room cooling needs, or compare steady heating loss and cooling heat gains using US county temperatures and assembly references.

Estimate concrete for slabs, columns, tubes, solid stairs or curb-and-gutter sections, with mixed units, allowance and volume-based pricing.

Estimate gravel volume, weight and cost for rectangular or circular beds, including bag counts from entered density and bag weight.

Estimate mulch volume and cost from bed dimensions or a known area, with depth and editable bulk-density assumptions.

Estimate roof surface from footprint, pitch or angle, then calculate allowance, area cost or whole material packages from coverage.

Estimate solar electricity savings, financing cash flow, and payback from system cost, generation, self-use, export rates, and your own tariff assumptions.

Calculate floor areas, borders and other supported shapes with mixed measurement units, repeated quantities and area-based costs.

Explore straight-stair geometry, standard or flush mounting and headroom using finished-floor dimensions and explicit layout assumptions.

Estimate tile quantities, boxes and cost using area or layout assumptions, with grout gaps and an allowance for cuts and waste.

Convert length, area, volume, mass, speed, energy, data and temperature units, with US, imperial and binary distinctions made explicit.

Find density from mass and volume, or solve for mass or volume using the labeled SI-unit relationship.

Calculate expenditure-based GDP or reconcile entered income components, capital consumption and statistical discrepancy to a domestic total.

Convert centimeters and feet/inches, or estimate adult height from parental measurements using the same mid-parental reference in either unit system.

Calculate mass from density and volume using the stated units, while distinguishing mass from gravitational weight.

Calculate molarity, solute mass or solution volume, and convert concentration units with explicit density for mass-fraction ppm or ppb.

Calculate molar mass and an element-by-element mass breakdown from a supported chemical formula and versioned atomic-mass data.

Convert integers and standard Roman numerals from 1 to 3,999, or express the components of a validated date in Roman notation.

Calculate speed, distance or travel time, including speed from independently selected distance units and an elapsed-duration input.

Convert mass units or calculate gravitational weight from mass and an entered local acceleration, keeping mass and force distinct.

Estimate dew point, relative humidity or air temperature with the liquid-water Magnus approximation and explicit input ranges.

Estimate NWS apparent heat from air temperature and humidity, or infer humidity from a supplied dew point.

Calculate National Weather Service wind chill for temperatures at or below 50°F and wind speeds above 3 mph.

Roll a selected number of dice with equally likely sides using cryptographic random selection, and view each roll and total.

Try a fictional name-match score for entertainment, with a repeatable result that makes no claim about relationship compatibility.

Estimate appliance energy use and cost from wattage, operating time and tariff, with an optional average-load factor.

Solve voltage, current, resistance and power from two supported known quantities in a DC or purely resistive model.

Find series or parallel resistance, decode supported color bands, or estimate conductor resistance from dimensions and conductivity.

Estimate DC or simplified AC voltage drop from conductor data, or convert AWG and kcmil sizes to nominal wire geometry.

Calculate power from torque and RPM, or explore empirical quarter-mile horsepower estimates from elapsed time or measured trap speed.

Compare EV and petrol ownership costs using purchase price, fuel or charging, mileage, maintenance, insurance, charging losses, and final resale values.

Estimate trip fuel and cost using metric, US or independently selected units for distance, fuel economy and pump price.

Measure observed fuel economy from distance and fuel used, or compare odometer readings and fuel cost with consistent fill-up assumptions.

Calculate power from torque or work, and convert mechanical, metric, electric and boiler horsepower with explicit unit definitions.

Find driving distance and estimated journey time between places or coordinates using OpenStreetMap roads.

Compare nominal tire dimensions and speedometer effects, or estimate the aspect ratio needed for a different rim at the same diameter.