BMI Calculator — BHF-style Heart-Health Check
The British Heart Foundation BMI calculator helps you check if your weight puts strain on your heart. Ours uses the identical NHS-standard formula and adds heart-disease risk context, NICE ethnicity bands, and reverse BMI to set a target.
Independent BMI tool. Not affiliated with BHF — we use the identical WHO/NHS standard formula and add features they don't offer.
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What you get here that BHF doesn't
Same NHS-standard formula. More tools. No sign-up wall.
Same WHO / NHS / BHF formula
Identical calculation and identical healthy-weight band (18.5–24.9) — your number will match the BHF tool exactly.
Heart-disease risk context
We include an entire heart-health guide and articles linking BMI to cardiovascular risk, blood pressure, and cholesterol — based on BHF, NHS, and peer-reviewed sources.
NICE ethnicity-adjusted thresholds
Lower BMI thresholds (23 / 27.5) for South Asian, Chinese, and Black adults — built right into the result panel, not buried in footnotes.
Reverse BMI to set a target
Pick a target BMI inside the BHF/NHS healthy range and instantly see the exact weight you need — in kg, lbs, or stones.
Free heart-health glossary
Plain-English definitions for BMI, visceral fat, cardiometabolic risk, CVD, blood pressure, and 100+ other terms.
No charity sign-up wall
BHF often asks for an email signup. Our tool is free, instant, and no email required.
Side-by-side comparison
| Feature | BMI Health Checker | BHF |
|---|---|---|
| NHS / WHO standard formula | ||
| Metric and imperial units | ||
| Stones and pounds (UK) | ||
| Heart-disease risk context | Linked to NHS+BHF | |
| NICE ethnicity-adjusted thresholds | Article only | |
| Reverse BMI (target weight) | — | |
| Child & teen BMI | — | |
| Pregnancy BMI | — | |
| Body fat percentage tool | — | |
| Calorie / TDEE calculator | — | |
| Heart-health guide | ||
| Save BMI history | — | |
| Email signup required | No | Often prompted |
| Cost | £0 | £0 |
Comparison based on publicly available information at time of publication. Features may change.
BHF BMI — Common Questions
Quick answers to the most common questions
Yes — the British Heart Foundation BMI calculator uses the same WHO/NHS-standard formula and the same healthy-weight range (BMI 18.5–24.9). The BHF adds heart-disease risk context. Our calculator uses the same formula too, so the BMI number you get here will match both the BHF and NHS tools.
A BMI above 25 increases the risk of high blood pressure, high cholesterol, type 2 diabetes, and coronary heart disease — all major risk factors for heart attack and stroke. The BHF identifies excess weight, especially around the waist, as one of the top six modifiable risk factors. Reducing BMI from the obese into the overweight range can meaningfully cut heart-disease risk over 5–10 years.
BMI 25–29.9 (overweight) moderately raises heart-disease risk. BMI 30 or above (obese) substantially raises risk, and BMI 35 or above (Class II obesity) is high risk for cardiovascular events. The BHF and NHS both recommend speaking to a GP about a weight-management plan at BMI 30+, especially if combined with high blood pressure, high cholesterol, or family history.
Yes. South Asian, Chinese, and Black adults develop heart disease and type 2 diabetes at lower BMIs than the standard WHO thresholds suggest. NICE recommends lower cut-offs of BMI 23 for increased risk and 27.5 for high risk in these groups. Our calculator includes these thresholds; the BHF tool covers them in supporting articles.
A high BMI is one factor among many. Other key signs are high blood pressure (over 140/90), high LDL cholesterol, smoking, a sedentary lifestyle, family history, and a large waist circumference (over 94 cm for men, 80 cm for women). Speak to your GP for a full cardiovascular risk assessment — the NHS uses tools like QRISK3 that combine BMI with these factors.
It's a useful screening tool but cardiac rehab patients should always follow their care team's guidance, which is individualised. After a heart event, weight goals are usually set in conjunction with blood pressure, cholesterol, medication adherence, and exercise tolerance — not BMI alone.
Yes — our articles cover waist measurement in detail. The BHF rule of thumb is: waist circumference over 94 cm for men or 80 cm for women indicates increased cardiovascular risk; over 102 cm for men or 88 cm for women is high risk. Combining BMI with waist gives a far better risk picture than BMI alone.
No — we're an independent UK health-tools site, not affiliated with the BHF. We use the same NHS-standard BMI formula because it's the universally accepted clinical standard, and we cite BHF and NHS sources in our heart-health articles.
Have another question? Browse our full article library or try a free calculator.