PCOS BMI & HOMA-IR Calculator: Insulin Resistance, Healthy Weight & IVF BMI Check

Q: What BMI do you need for IVF?

Most clinics prefer a BMI below 35, and some (including many UK NHS services) require below 30. A higher BMI lowers IVF success and raises pregnancy risks, but every clinic sets its own limit.

Q: What is a normal HOMA-IR for PCOS?

A HOMA-IR below 2.0 is generally normal; 2.0–2.9 suggests early insulin resistance and 3.0 or higher indicates significant insulin resistance, which is common in PCOS.

Q: How much weight loss helps PCOS fertility?

Losing just 5–10% of body weight can restore regular ovulation in many women with PCOS and improves the response to letrozole.

Q: Can thin women have PCOS?

Yes. About 1 in 5 women with PCOS have a healthy BMI (“lean PCOS”), and many still have insulin resistance.

Q: Should South Asian women use different BMI cut-offs?

Yes. WHO recommends lower action points for Asian populations: overweight from 23 and obesity from 27.5 kg/m².

🩺 PCOS BMI & Insulin Resistance Calculator

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Weight (kg)

Height unit

Height (cm)

BMI cut-offs

Waist (cm, optional)

Fasting glucose

Fasting insulin (µIU/mL, optional)

Calculator Rotterdam check BMI cut-offs HOMA-IR guide FAQ

PCOS Rotterdam Criteria Self-Check

PCOS is diagnosed in adults when 2 of these 3 features are present and other causes are excluded:

Irregular or absent periods (cycles > 35 days or < 8 periods a year) Excess androgen: acne, excess facial/body hair, scalp hair thinning, or high testosterone on a blood test Polycystic ovaries on ultrasound (≥ 20 follicles per ovary) or a high AMH

BMI Categories: WHO vs. Asian Cut-offs

Category	WHO international	WHO Asian / South Asian
Underweight	< 18.5	< 18.5
Healthy	18.5 – 24.9	18.5 – 22.9
Overweight	25.0 – 29.9	23.0 – 27.4
Obesity	≥ 30	≥ 27.5

People of South Asian heritage develop insulin resistance and diabetes at lower BMI, which is why lower cut-offs are recommended for Bangladesh, India and Pakistan.

HOMA-IR Insulin Resistance Interpretation

HOMA-IR = fasting glucose (mg/dL) × fasting insulin (µIU/mL) ÷ 405 or glucose (mmol/L) × insulin ÷ 22.5

HOMA-IR	Interpretation
< 1.0	Optimal insulin sensitivity
1.0 – 1.9	Normal
2.0 – 2.9	Early insulin resistance
≥ 3.0	Significant insulin resistance

Fast for 8–12 hours before the blood test.
Insulin resistance worsens PCOS symptoms and lowers ovulation rates — exercise and weight loss improve it within weeks.

Frequently Asked Questions

What BMI do you need for IVF?

Most clinics prefer a BMI below 35, and some (including many UK NHS services) require below 30. A higher BMI lowers IVF success and raises pregnancy risks, but every clinic sets its own limit.

What is a normal HOMA-IR for PCOS?

A HOMA-IR below 2.0 is generally normal; 2.0–2.9 suggests early insulin resistance and 3.0 or higher indicates significant insulin resistance, which is common in PCOS.

How much weight loss helps PCOS fertility?

Losing just 5–10% of body weight can restore regular ovulation in many women with PCOS and improves the response to letrozole.

Can thin women have PCOS?

Yes. About 1 in 5 women with PCOS have a healthy BMI (“lean PCOS”), and many still have insulin resistance.

Should South Asian women use different BMI cut-offs?

Yes. WHO recommends lower action points for Asian populations: overweight from 23 and obesity from 27.5 kg/m².

⚠️ Official Medical Disclaimer

This calculator is for informational and educational purposes only. It produces mathematical estimates based on published clinical literature (ACOG, ASRM, ESHRE, NICE, WHO, NEJM) and is not a medical diagnosis, treatment plan, or method of contraception.

Every body and every treatment cycle is different. Always discuss your results with a qualified OB-GYN, reproductive endocrinologist, or fertility specialist before making any medical decision. Seek urgent care for heavy bleeding, severe one-sided pain, fainting, or fever.

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