How much weight do you lose after giving birth?

Early loss is often fluid (blood volume, placenta, fluids) — not all fat. This tool compares your entered delivery weight to now. Default: delivery 68 kg → current 62 kg at 6 weeks = down 6 kg (~1 kg/week). US example at 8 weeks: down 15 lb, still 10 lb above pre-pregnancy. At only 2 weeks, a 4 kg drop in 2 weeks (~2 kg/week) is often mostly fluid — pace is unstable that early.

How is average weekly postpartum weight loss calculated?

(Delivery weight − current weight) ÷ weeks since delivery. Default 6 weeks: (68 − 62) ÷ 6 = 1 kg/week. At 12 weeks with current 64 kg instead of 62: 0.3 kg/week (slower average). Enter 0 weeks to see totals only without a weekly rate. Loss faster than ~1 kg/week (~2.2 lb) may warrant a conversation with your clinician, especially while breastfeeding.

What is estimated gestational weight gain in this calculator?

Delivery weight minus pre-pregnancy weight from your entries — not your hospital chart. Default: 68 − 58 = 10 kg estimated gain at delivery. If you lost 6 kg since delivery, that is about 60% of that estimate. Compare to IOM ranges in our pregnancy weight gain calculator for whether total pregnancy gain was in a typical band.

How far am I from my pre-pregnancy weight?

Current − pre-pregnancy. Default: 62 − 58 = +4 kg above pre-pregnancy. Linear extrapolation at 1 kg/week → ~4 more weeks to reach 58 kg if pace stayed identical (it usually does not). At-pre example: current equals pre at 10 weeks — tool shows at/below pre-pregnancy. Many people take months to a year+; returning is not required for health.

What is a normal BMI after pregnancy?

Optional height gives current BMI. Default (165 cm, 62 kg) → BMI 22.8 (Normal weight), pre-pregnancy was ~21.3. BMI does not capture muscle, fluid, or postpartum body composition. Use it as context with your care team, not a pass/fail grade.

Should I try to lose pregnancy weight quickly postpartum?

Usually no — recovery, lactation, sleep, and mood matter more than rapid scale drops. ACOG discusses gradual return to activity when cleared, not crash dieting. While nursing, energy needs are higher (see our breastfeeding calorie calculator). Default pace 1 kg/week is moderate; if you were losing >1 kg/week without supervision, discuss nutrition with OB or lactation support.

Why does my weight go up after delivery in some weeks?

This calculator allows that: delivery 70 kg → current 72 kg at 4 weeks shows weight gained since delivery (example scenario: +2 kg on the scale). Causes can include fluid retention, thyroid shifts, less activity, stress eating, or normal variance — not necessarily fat gain. Track trends over weeks, not single days.

Does breastfeeding change postpartum weight loss?

Breastfeeding burns extra energy but also increases hunger; net effect varies. This tool does not add lactation calories — pair with the breastfeeding calorie calculator for intake context. Some people lose quickly while nursing; others hold weight until weaning. Do not restrict calories aggressively without clinician guidance while exclusively breastfeeding.

When can I start exercising for weight loss postpartum?

Follow your obstetric clinician — timing depends on delivery type, bleeding, healing, and complications. ACOG materials often discuss gradual return when cleared, not day-one intense deficits. Weight on the scale may lag behind fitness gains from walking, strength, and sleep improvements.

What if I do not know my exact delivery-day weight?

Use the closest clinic or hospital weight within 1–2 days of birth. A 2–3 kg error shifts weekly averages: if true delivery was 70 kg not 68 kg, six-week loss looks smaller. Re-run the calculator when you find a better chart value.

How does this relate to the pregnancy weight gain calculator?

Pregnancy tool: recommended total gain by pre-pregnancy BMI. Postpartum tool: backward look from delivery to now. Default estimated gain 10 kg — check whether that matched your IOM band when pregnant. Together they frame the story; neither replaces medical records.

Is this medical advice?

No. Educational math only. Seek urgent care for chest pain, shortness of breath, severe headache, heavy bleeding, fever, or thoughts of self-harm. Discuss weight, mood, and thyroid symptoms with your postpartum care team.

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Maternal recovery · tracking

Postpartum Weight Loss Calculator — Change Since Delivery

Free postpartum weight loss calculator: compare delivery weight to now, see a weekly average, optional BMI, and distance to pre-pregnancy weight. Not medical advice — discuss goals with your care team.

Last updated: May 25, 2026

Default 6 wk: down 6 kg · ~1 kg/week

4 kg above pre-pregnancy · ~60% of est. gain lost

Linear “weeks to pre” estimate ~4 wk (illustrative)

Planning pregnancy gain? Pregnancy weight gain calculator

Postpartum weight change

Delivery weight vs now — optional height for BMI

Weeks since delivery

Use 0 if you only want totals (no weekly average).

Height (optional — for BMI)

Height

Pre-pregnancy weight

Weight around delivery

Current weight

Down 6 kg since delivery over 6 weeks · 4 kg above pre-pregnancy · ~1 kg/week average loss · ~60% of estimated pregnancy gain lost since delivery · linear extrapolation ~4 weeks to pre-pregnancy at same pace (not a guarantee).

Change since delivery

Down 6.0 kg

Compared with your entered delivery weight (fluid and timing affect early readings).

Est. gain (delivery − pre)

10.0 kg

Vs pre-pregnancy

+4.0 kg

Rough share of estimated pregnancy gain lost: 60%

Illustrative only — fluid and timing affect the scale.

Average per week (delivery → now)

Down ~1.0 kg / week

If that pace continued linearly (not realistic long-term), roughly 4 weeks to reach pre-pregnancy weight.

Current BMI (from height)

22.8 — Normal weight

Pre-pregnancy BMI was about 21.3

Still above pre-pregnancy weight. Nutrition and activity should follow your postpartum care team, especially while breastfeeding.

Default snapshot (6 weeks postpartum)

Since delivery

−6 kg

Weekly avg

1 kg/wk

Vs pre-pregnancy

+4 kg

BMI now

22.8 (Normal weight)

Formulas used

Change since delivery = delivery weight − current weight

Vs pre-pregnancy = current − pre-pregnancy

Est. pregnancy gain = delivery − pre-pregnancy

Avg per week = change since delivery ÷ weeks (if weeks > 0)

% gain lost = change since delivery ÷ est. gain (if gain > 0 and you lost weight)

Postpartum timeline context (educational)

Days 0–14Large fluid and blood-volume shifts; scale can drop several lb/kg quickly without fat loss

Weeks 2–6Many people see continued gradual decline; breastfeeding may affect appetite and energy

Weeks 6–12ACOG often discusses return to activity when cleared—pace varies widely

Months 3–12+Pre-pregnancy weight may take many months; linear extrapolation here is illustrative only

Worked scenarios

Default — 6 weeks postpartum

58 → 68 kg delivery → 62 kg now (metric)

Down 6 kg since delivery

~1 kg/week

Vs pre: +4 kg

60% est. gain lost

8 weeks — US units

140 lb pre → 165 lb delivery → 150 lb now

Down 15 lb since delivery

~1.9 lb/week

Vs pre: +10 lb

60% est. gain lost

12 weeks — slower weekly pace

Same delivery weight, less total loss so far

Down 4 kg since delivery

~0.3 kg/week

Vs pre: +6 kg

40% est. gain lost

2 weeks — early postpartum

Mostly fluid shift; pace not stable yet

Down 4 kg since delivery

~2 kg/week

Vs pre: +8 kg

33% est. gain lost

At pre-pregnancy weight

Current equals pre-pregnancy entry

Down 10 kg since delivery

~1 kg/week

Vs pre: +0 kg

100% est. gain lost

Heavier than at delivery

Scale up since birth — still valid math

Down -2 kg since delivery

~-0.5 kg/week

Vs pre: +17 kg

Limitations

Does not model body composition, muscle, or fluid retention—scale weight only
Weekly average assumes steady linear change; real postpartum curves are not straight lines
Breastfeeding, thyroid, sleep, medications, and mental health affect weight—not in this math
“Weeks to pre-pregnancy at current pace” is a thought experiment, not a prediction
Seek obstetric, primary care, or lactation support for individualized goals and red-flag symptoms

References

Not medical advice. Postpartum mood changes, bleeding, pain, or breastfeeding concerns need clinical care — not only a weight spreadsheet.

Frequently Asked Questions

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Maternal recovery · tracking

Postpartum Weight Loss Calculator — Change Since Delivery

Last updated: May 25, 2026

Default 6 wk: down 6 kg · ~1 kg/week

4 kg above pre-pregnancy · ~60% of est. gain lost

Linear “weeks to pre” estimate ~4 wk (illustrative)

Planning pregnancy gain? Pregnancy weight gain calculator

Postpartum weight change

Delivery weight vs now — optional height for BMI

Weeks since delivery

Use 0 if you only want totals (no weekly average).

Height (optional — for BMI)

Height

Pre-pregnancy weight

Weight around delivery

Current weight

Change since delivery

Down 6.0 kg

Compared with your entered delivery weight (fluid and timing affect early readings).

Est. gain (delivery − pre)

10.0 kg

Vs pre-pregnancy

+4.0 kg

Rough share of estimated pregnancy gain lost: 60%

Illustrative only — fluid and timing affect the scale.

Average per week (delivery → now)

Down ~1.0 kg / week

If that pace continued linearly (not realistic long-term), roughly 4 weeks to reach pre-pregnancy weight.

Current BMI (from height)

22.8 — Normal weight

Pre-pregnancy BMI was about 21.3

Still above pre-pregnancy weight. Nutrition and activity should follow your postpartum care team, especially while breastfeeding.

Default snapshot (6 weeks postpartum)

Since delivery

−6 kg

Weekly avg

1 kg/wk

Vs pre-pregnancy

+4 kg

BMI now

22.8 (Normal weight)

Formulas used

Change since delivery = delivery weight − current weight

Vs pre-pregnancy = current − pre-pregnancy

Est. pregnancy gain = delivery − pre-pregnancy

Avg per week = change since delivery ÷ weeks (if weeks > 0)

% gain lost = change since delivery ÷ est. gain (if gain > 0 and you lost weight)

Postpartum timeline context (educational)

Days 0–14Large fluid and blood-volume shifts; scale can drop several lb/kg quickly without fat loss

Weeks 2–6Many people see continued gradual decline; breastfeeding may affect appetite and energy

Weeks 6–12ACOG often discusses return to activity when cleared—pace varies widely

Months 3–12+Pre-pregnancy weight may take many months; linear extrapolation here is illustrative only

Worked scenarios

Default — 6 weeks postpartum

58 → 68 kg delivery → 62 kg now (metric)

Down 6 kg since delivery

~1 kg/week

Vs pre: +4 kg

60% est. gain lost

8 weeks — US units

140 lb pre → 165 lb delivery → 150 lb now

Down 15 lb since delivery

~1.9 lb/week

Vs pre: +10 lb

60% est. gain lost

12 weeks — slower weekly pace

Same delivery weight, less total loss so far

Down 4 kg since delivery

~0.3 kg/week

Vs pre: +6 kg

40% est. gain lost

2 weeks — early postpartum

Mostly fluid shift; pace not stable yet

Down 4 kg since delivery

~2 kg/week

Vs pre: +8 kg

33% est. gain lost

At pre-pregnancy weight

Current equals pre-pregnancy entry

Down 10 kg since delivery

~1 kg/week

Vs pre: +0 kg

100% est. gain lost

Heavier than at delivery

Scale up since birth — still valid math

Down -2 kg since delivery

~-0.5 kg/week

Vs pre: +17 kg

Limitations

Does not model body composition, muscle, or fluid retention—scale weight only
Weekly average assumes steady linear change; real postpartum curves are not straight lines
Breastfeeding, thyroid, sleep, medications, and mental health affect weight—not in this math
“Weeks to pre-pregnancy at current pace” is a thought experiment, not a prediction
Seek obstetric, primary care, or lactation support for individualized goals and red-flag symptoms