Weight After Pregnancy Calculator

Work out weight after pregnancy instantly with clear inputs, formula shown and shareable results.

About Weight After Pregnancy Calculator

Delivery immediately removes the baby, placenta and amniotic fluid - roughly the birth weight plus 2 kg - and further fluid clears over the following weeks. Gaining 14 kg with a 3.4 kg baby leaves about 8.4 kg retained at delivery, typically declining around 0.4 kg a week thereafter. Retention of a few kilograms at six months is common and normal.

Formulas

Immediate loss

baby weight + about 0.7 kg placenta + about 1.5 kg fluid

Retention

retained = total gain - immediate loss, declining gradually

Worked example

With the default values below, Weight After Pregnancy Calculator returns Estimated Weight Now of 71.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Pre-pregnancy weightminimum 0 kg: 65 kg
Weight at deliveryminimum 0 kg: 79 kg
Baby's birth weightminimum 0 kg: 3.4 kg
Weeks since deliveryminimum 0: 6

Results

Estimated Weight Now: 71.00 kg
Weight Retained After Delivery: 8.40 kg
Retention Still Expected At This Point: 6.00 kg
Total Pregnancy Weight Gain: 14.00 kg

Step by step

1Values used
2Immediate loss
3Retention
4Estimated Weight Now= 71.00 kg
5Weight Retained After Delivery= 8.40 kg
6Retention Still Expected At This Point= 6.00 kg
7Total Pregnancy Weight Gain= 14.00 kg

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
This is a general estimate only and not medical advice. Postpartum weight change varies widely and is affected by breastfeeding, sleep, recovery and any complications. Discuss postpartum weight and nutrition with your midwife, health visitor or doctor rather than working to a calculated target.
This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

This is a general estimate only and not medical advice. Postpartum weight change varies widely and is affected by breastfeeding, sleep, recovery and any complications. Discuss postpartum weight and nutrition with your midwife, health visitor or doctor rather than working to a calculated target.

Frequently Asked Questions

How long does it take to return to pre-pregnancy weight?

Six to twelve months is typical, and many women retain 1-3 kg longer term. Individual variation is very wide.

Does breastfeeding help?

It adds roughly 300-500 kcal a day of energy demand, which helps modestly, though appetite often compensates.