Clinical guidance on menstrual dates, ultrasound dating, assisted reproduction, and the uncertainty of an estimated due date.
Health & fitness
Pregnancy weight gain
Enter your values below for a clear, instant result.
Your result
kg gained
Pre-pregnancy standard BMI; singleton total reference 11.5–16 kg
Expected through week 244.4–7.5 kg
Position vs week rangeWithin reference
FormulaPre-pregnancy BMI selects the CDC/IOM singleton total and weekly gain ranges; actual gain = current − pre-pregnancy weight.
- Enter the known values.
- Apply the displayed formula.
- Review the result and supporting values.
Worked example: Recommendations differ for twins and individual medical circumstances.
Estimate notice: This pregnancy weight gain result is an estimate based only on the values and assumptions shown. Verify important decisions with the relevant official source or a qualified professional.
Educational estimate only—not medical advice. Individual health needs vary; consult a qualified clinician when making health decisions.
Understand the result before using it
Pregnancy weight gain uses pre-pregnancy weight, height, current weight, and pregnancy week to calculate its result. It uses a population-based health or fitness equation to produce an educational estimate from your measurements.
Formula, assumptions, and example
Formula
Pre-pregnancy BMI selects the CDC/IOM singleton total and weekly gain ranges; actual gain = current − pre-pregnancy weight.
Assumptions
- The entered pre-pregnancy weight, height, current weight, and pregnancy week are complete, valid, and use the units or format shown beside each field.
- Measurements are accurate and were taken using the method expected by the equation.
- Population averages are an acceptable starting point for this educational calculation.
Worked example
Recommendations differ for twins and individual medical circumstances.
When to use it
Good uses
- Understand a general screening measure or planning range.
- Track a consistent estimate over time while using the same method.
- Prepare an informed discussion with a qualified healthcare professional.
Limitations
Common mistakes to avoid
- Individual biology, pregnancy, age, medication, disability, training status, and clinical history may make the estimate unsuitable.
- The result cannot diagnose a condition or prescribe treatment, diet, exercise, or medication.
- Educational estimate only—not medical advice. Individual health needs vary; consult a qualified clinician when making health decisions.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Explains BMI as a screening measure and describes important limitations.
Questions about this calculation
What does the Pregnancy weight gain calculate?
Pregnancy weight gain uses pre-pregnancy weight, height, current weight, and pregnancy week to calculate its result. It uses a population-based health or fitness equation to produce an educational estimate from your measurements. The formula used is: Pre-pregnancy BMI selects the CDC/IOM singleton total and weekly gain ranges; actual gain = current − pre-pregnancy weight.
Which inputs affect the Pregnancy weight gain result?
The result uses pre-pregnancy weight, height, current weight, and pregnancy week. Changing any of these values can change the output, so enter them using the labels and units shown.
Is the Pregnancy weight gain result exact?
This pregnancy weight gain result is an estimate based only on the values and assumptions shown. Verify important decisions with the relevant official source or a qualified professional.
When should I verify a Pregnancy weight gain result?
Verify it before any financial, health, academic, construction, safety, or engineering decision. Use the primary source or an appropriately qualified professional.
Clear answers, without the guesswork
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2Review the calculation
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