- Pre-pregnancy BMI
- 21.22
- Current cumulative gain
- 5 kg
- Total reference gain
- 11.5–16 kg
- Second/third-trimester reference rate
- 0.35–0.5 kg/week
About this result
A single measurement cannot establish whether gain is appropriate. Discuss patterns, fetal growth, and clinical context with your care team.
Published total and weekly ranges are rounded independently. They do not define an exact week-by-week required weight.
How it works
Use the starting pregnancy measurements
The reference group uses pre-pregnancy weight and height, while current weight calculates gain. Replacing starting weight with today’s weight changes both quantities and can make the comparison misleading, even if every number looks plausible.
Reading pregnancy weight-gain references
The calculator compares the entered pregnancy information with the reference framework described on this page. Check the starting measurements and pregnancy timing before interpreting the result. A reference range does not determine what is appropriate for every pregnancy or explain a sudden change in weight. Individual maternity care takes account of information that is not captured by this calculation.
Pregnancy gain reference: formula and assumptions
Pre-pregnancy BMI = kg/m². Current gain = current weight − pre-pregnancy weight. Reference totals and rates come from published BMI-specific guidance.
Full-pregnancy totals are separate from average second- and third-trimester weekly rates. The week selects the relevant context; no exact required weight is predicted for a particular day. Twin ranges are provisional and do not have a universal weekly trajectory.
Worked example
Using the Pregnancy gain reference example:
- Measurement system
- Metric (kg, cm)
- Pre-pregnancy weight (kg)
- 65
- Current weight (kg)
- 70
- Height (cm)
- 175
- Completed pregnancy weeks (weeks)
- 24
- Pregnancy type
- One baby
Pre-pregnancy BMI = kg/m². Current gain = current weight − pre-pregnancy weight. Reference totals and rates come from published BMI-specific guidance.
Example result
Pre-pregnancy BMI: 21.22
Current cumulative gain: 5 kg
Total reference gain: 11.5–16 kg
Second/third-trimester reference rate: 0.35–0.5 kg/week
- A single measurement cannot establish whether gain is appropriate. Discuss patterns, fetal growth, and clinical context with your care team.
- Published total and weekly ranges are rounded independently. They do not define an exact week-by-week required weight.
These are illustrative inputs. Change the values to explore a different scenario.
Formula references
- CDC: weight gain during pregnancy (opens in a new tab)
- National Academies: pregnancy weight-gain guidance, Table 7-3 (opens in a new tab)
References explain the underlying methods; they do not imply endorsement or individual professional review of Finflo.
Common questions
Is the result a required weight for my exact pregnancy week?
No. It separates full-pregnancy reference totals from average later-trimester rates and does not prescribe an exact daily weight.
Are twin-pregnancy ranges the same as singleton ranges?
No. Twin ranges are provisional references and do not have a universal weekly trajectory. Clinical context remains necessary.
Prepared by Finflo. See our methodology and editorial policy. Read the relevant professional-advice limitations.