BMI calculatorYour BMI and healthy weight range for women and men in kg, lb or stone, with a BMI chart and NICE's ethnicity thresholds.TDEE and calorie deficitYour maintenance calories (TDEE), BMR, a safe calorie deficit and a rough timeline to your goal weight.A1c to blood sugarConvert A1c to average blood sugar and between % and mmol/mol, with a full chart and what your number means.Waist-to-height ratioCheck whether your waist is less than half your height, with NICE's risk bands and how to measure.
How our calculators work
- Private. They run entirely in your browser. Nothing you enter is sent to us or stored.
- Sourced. Each one uses a published formula or guideline — NICE, CDC, NGSP and the American Diabetes Association — listed on the page.
- Built for three countries. Metric, US and UK units, and notes on what's free in the US, Canada and UK.
- Safe by design. They estimate and explain; they never diagnose, and we don't publish medicine dosing calculators.
General information, not medical advice — see our medical disclaimer. These results are estimates and can't diagnose anything. In an emergency, call 911 (US, Canada) or 999 (UK).