Pregnancy Weight Gain Calculator

Compare pregnancy weight gain with the ranges used by the selected method. Enter your own values below to see singleton total-pregnancy gain guideline and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Uses IOM adult singleton-pregnancy total-gain ranges by pre-pregnancy BMI; it is not a week-by-week target.

Before you use the result

  • Your maternity clinician may recommend a different range. These ranges do not apply to twin/multiple pregnancies.

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What is Pregnancy Weight Gain Calculator?

Pregnancy Weight Gain Calculator helps you compare pregnancy weight gain with the ranges used by the selected method.

The main result is singleton total-pregnancy gain guideline, with a breakdown of gain so far and pre-pregnancy BMI. The formula, example and assumptions below explain how to interpret it.

How to use Pregnancy Weight Gain Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather pre-pregnancy weight (kg), height (cm) and current weight (kg). Use values from the same situation or reporting period.
  2. Replace the example pre-pregnancy weight with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read singleton total-pregnancy gain guideline with its result breakdown. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter pre-pregnancy weight in kg, at least 20 and at most 300. Decimals are accepted.
  • Enter height in cm, at least 100 and at most 220. Decimals are accepted.
  • Enter current weight in kg, at least 20 and at most 350. Decimals are accepted.

Pregnancy Weight Gain Calculator: a worked example

With the inputs below, the result is 11.5–16 kg (singleton total-pregnancy gain guideline). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Pre-pregnancy weight (kg)60 kg
Height (cm)165 cm
Current weight (kg)65 kg
Singleton total-pregnancy gain guideline11.5–16 kg
Gain so far5 kg
Pre-pregnancy BMI22.038567

Understanding the Pregnancy Weight Gain result

Read singleton total-pregnancy gain guideline alongside gain so far and pre-pregnancy BMI. These describe different parts of the same calculation.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

  • Example Gain so far: 5 kg
  • Example Pre-pregnancy BMI: 22.038567

Pregnancy Weight Gain Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Your maternity clinician may recommend a different range. These ranges do not apply to twin/multiple pregnancies.
  • Health estimates are context-dependent. Age, pregnancy, illness, medication and individual measurements can affect interpretation; these tools do not diagnose a condition.

For wider guidance, visit World Health Organization. The formula and scope of this specific tool are stated on this page.

Pregnancy Weight Gain Calculator FAQs

What does Pregnancy Weight Gain Calculator calculate?

Pregnancy Weight Gain Calculator helps you compare pregnancy weight gain with the ranges used by the selected method. Its main output is singleton total-pregnancy gain guideline in kg.

What inputs do I need for Pregnancy Weight Gain Calculator?

You need pre-pregnancy weight (kg), height (cm) and current weight (kg). Use the field labels and units to match your figures to the formula.

Which formula does Pregnancy Weight Gain Calculator use?

Uses IOM adult singleton-pregnancy total-gain ranges by pre-pregnancy BMI; it is not a week-by-week target.

What is a worked example for Pregnancy Weight Gain Calculator?

Example inputs: Pre-pregnancy weight: 60 kg; Height: 165 cm; Current weight: 65 kg. The result is 11.5–16 kg (singleton total-pregnancy gain guideline).

How should I enter pre-pregnancy weight?

Enter pre-pregnancy weight in kg, at least 20 and at most 300. Decimals are accepted.

How do I choose height?

Enter height in cm, at least 100 and at most 220. Decimals are accepted. The example uses 165 cm; replace it if your circumstances differ.

How should I read singleton total-pregnancy gain guideline?

Read singleton total-pregnancy gain guideline alongside gain so far and pre-pregnancy BMI. These describe different parts of the same calculation.

Why might my Pregnancy Weight Gain Calculator result differ from my records?

Your maternity clinician may recommend a different range. These ranges do not apply to twin/multiple pregnancies. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in Pregnancy Weight Gain Calculator?

Yes. Note your first singleton total-pregnancy gain guideline, change pre-pregnancy weight or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is Pregnancy Weight Gain Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.