Stage 1 of 5Trying to get pregnantSee the full journey ↓

BMI before treatment calculator

Is my weight OK for treatment?

Q: Is BMI a fair measure?

It is a crude one. It does not distinguish muscle from fat and performs differently across populations — several bodies use lower thresholds for South Asian populations. It is used because it is simple and reproducible, not because it is precise.

Q: Will a high BMI stop me having treatment?

It depends entirely on the unit. Thresholds are usually set for anaesthetic safety at retrieval rather than as a judgement about outcomes. Ask what the policy is before you plan around it.

Q: Does BMI affect IVF success or just access?

Both, though less than most people assume. The larger effect is practical — medication dosing and anaesthetic safety at retrieval, which is why access thresholds exist. The effect on outcomes is real but modest compared with age.

Body mass index is used by many units when planning treatment, because it affects medication dosing, anaesthetic safety, and some outcomes.

Weight

Height

These are example numbers. Replace them with yours, then press Calculate.

Example answer

23.9kg/m²

18.5–25

Within the standard range used by most units.

This is a guide, not a diagnosis. Share the result with your doctor.

Your result on the scale

The ranges this calculator uses. Yours is highlighted.

Your numbers

Everything worked out from what you entered.

Weight: 65 kg
Height: 165 cm

What each result means

Your result is highlighted. Your own clinic's advice always comes first.

Your result<18.5

Below the standard range. Being significantly underweight can affect ovulation, and some units ask for this to be addressed before starting.

Your result18.5–25

Within the standard range used by most units.

Your result25–30

Above the standard range. Rarely a barrier to treatment on its own, though it can affect medication dosing.

Your result30–35

Some units set access thresholds in this range, and it affects anaesthetic planning for retrieval. Worth asking your unit about its own policy.

Your result35+

Many units have thresholds at or below this point, largely for anaesthetic safety at retrieval. This is a policy question worth raising early rather than close to starting.

Where this fits in your journey

The usual order, from trying to conceive to pregnancy. Not everyone needs every stage. This calculator belongs to stage 1.

Stage 1 · you are here

Trying to get pregnant

Timing and the basics, before any treatment.

This calculator: Is my weight OK for treatment?

Calculators for what comes next

How this is worked out

Exact calculationArithmetic on the numbers you enter. If your inputs are right, this figure is right.

BMI is weight in kilograms divided by height in metres squared. Fertility units use it mainly for medication dosing and anaesthetic safety at egg retrieval; access thresholds vary by unit and some bodies apply lower thresholds for South Asian populations.

About this calculator

?What it tells you

Your BMI and what clinics look for. Body mass index is used by many units when planning treatment, because it affects medication dosing, anaesthetic safety, and some outcomes.

✓When to use it

Before booking, if a unit has mentioned a threshold

iWhat you need

Weight (kg)
Height (cm)

!What it cannot tell you

BMI thresholds for treatment access are set by individual units and vary. Some bodies apply lower thresholds for South Asian populations.

Common questions

Is BMI a fair measure?

It is a crude one. It does not distinguish muscle from fat and performs differently across populations — several bodies use lower thresholds for South Asian populations. It is used because it is simple and reproducible, not because it is precise.

Will a high BMI stop me having treatment?

It depends entirely on the unit. Thresholds are usually set for anaesthetic safety at retrieval rather than as a judgement about outcomes. Ask what the policy is before you plan around it.

Does BMI affect IVF success or just access?

Both, though less than most people assume. The larger effect is practical — medication dosing and anaesthetic safety at retrieval, which is why access thresholds exist. The effect on outcomes is real but modest compared with age.

Sources

Standard WHO BMI categories. Access thresholds are set by individual units and vary considerably.

WHO body mass index classification

In an emergency

If you have any of the warning signs listed here, don't wait for a test result or a calculator. Get help now.

112All emergencies, anywhere in India 108Ambulance

Also call your IVF clinic. Most clinics give an emergency number on your treatment or discharge sheet. Save it in your phone now, before you need it.