- Estimated resting energy
- 1,648.75 kcal/day
- Resting energy in kilojoules
- 6,898.37 kJ/day
How it works
Separate prediction from changing inputs
In the Mifflin equation, increasing entered age by one year lowers the estimate by 5 kcal/day when other inputs stay fixed. That small formula adjustment is not a measurement of your metabolism changing overnight.
Resting energy versus daily energy needs
For a 30-year-old using the male coefficient, weighing 70 kg and measuring 175 cm, the displayed equation gives 10 × 70 + 6.25 × 175 − 5 × 30 + 5 = 1,648.75 kcal/day. This is estimated resting energy expenditure. For an activity-adjusted estimate of total daily expenditure, use the TDEE Calculator. Neither number measures metabolism directly or sets a personal eating target. Enter height in the requested unit; substituting 1.75 meters where centimeters are expected produces a substantial error.
Resting energy: formula and assumptions
Mifflin–St Jeor: BMR = 10w + 6.25h − 5a + s; s = 5 for male and −161 for female. TDEE = BMR × activity factor.
Weight is in kilograms, height in centimeters, and age in years. This is a population estimate, not a measured metabolic rate.
Food energy conversion: formula and assumptions
1 kilocalorie = 4.184 kilojoules.
A food Calorie with a capital C is one kilocalorie.
Calories, kilocalories & joules: formula and assumptions
1 thermochemical cal = 4.184 J; 1 food Calorie = 1 kcal = 1,000 cal.
Capital-C dietary Calories represent kilocalories. The converter keeps small calories, food Calories and joules clearly distinguished.
Worked example
Using the Resting energy example:
- Sex used by the equation
- Male
- Age (years)
- 30
- Measurement system
- Metric (kg, cm)
- Weight (kg)
- 70
- Height (cm)
- 175
- Energy equation
- Mifflin–St Jeor
Mifflin–St Jeor: BMR = 10w + 6.25h − 5a + s; s = 5 for male and −161 for female. TDEE = BMR × activity factor.
Example result
Estimated resting energy: 1,648.75 kcal/day
Resting energy in kilojoules: 6,898.37 kJ/day
These are illustrative inputs. Change the values to explore a different scenario.
What to keep in mind
Adult estimates do not apply to pregnancy, breastfeeding, growing children, or individualized medical nutrition care.
Formula references
- Mifflin et al.: resting energy expenditure (opens in a new tab)
- NIST SP 811 Appendix B.8 conversion factors (opens in a new tab)
References explain the underlying methods; they do not imply endorsement or individual professional review of Finflo.
Common questions
How is resting energy different from daily maintenance energy?
Resting energy estimates basic energy expenditure. The activity multiplier produces a broader daily estimate that includes activity assumptions.
Is the equation a measured metabolic rate?
No. It is a population estimate from body measurements and age, not a direct test of an individual's metabolism.
Prepared by Finflo. See our methodology and editorial policy. Read the relevant professional-advice limitations.