Health & Fitness Calculators
Free health and fitness calculators using recognised formulas and NHS guidance: BMI, basal metabolic rate, ideal weight and more.
- Calculators16
- Rules and figuresUK, November 2026
- CostFree, no sign-up
Health & fitness calculators
BMI calculatorAdult BMI with NHS categories and your healthy weight range.Ideal weightHealthy weight range for your height, plus classic formulas.BMR calculatorBasal metabolic rate and daily calories by activity level.Protein calculatorHow much protein you need a day for your weight and goal.Alcohol unitsUnits in your drinks and your weekly total vs the 14-unit guideline.Cholesterol ratioTotal/HDL ratio, non-HDL and NHS healthy levels from your test.QRISK3 heart risk10-year heart attack and stroke risk using the QRISK3 equations.Height percentileChild height centile on UK growth charts, adult height percentile.ACB calculatorTotal anticholinergic burden score for a list of medicines.eGFR calculatoreGFR from creatinine (CKD-EPI) and the CKD stage G1 to G5.TDEE calculatorTotal daily energy expenditure and calories to lose or gain.Macro calculatorDaily protein, carb and fat grams from your calorie target.Sleep calculatorBest bedtime or wake-up time using 90-minute sleep cycles.Calorie deficitDaily calories for safe weight loss and time to reach your goal.Corrected calciumAdjust a total calcium result for a low or high albumin level.Body fat calculatorBody fat % from tape measurements or BMI, with healthy ranges.
What each calculator does
| Calculator | What it works out |
|---|---|
| BMI calculator | Adult BMI with NHS categories and your healthy weight range. |
| Ideal weight | Healthy weight range for your height, plus classic formulas. |
| BMR calculator | Basal metabolic rate and daily calories by activity level. |
| Protein calculator | How much protein you need a day for your weight and goal. |
| Alcohol units | Units in your drinks and your weekly total vs the 14-unit guideline. |
| Cholesterol ratio | Total/HDL ratio, non-HDL and NHS healthy levels from your test. |
| QRISK3 heart risk | 10-year heart attack and stroke risk using the QRISK3 equations. |
| Height percentile | Child height centile on UK growth charts, adult height percentile. |
| ACB calculator | Total anticholinergic burden score for a list of medicines. |
| eGFR calculator | eGFR from creatinine (CKD-EPI) and the CKD stage G1 to G5. |
| TDEE calculator | Total daily energy expenditure and calories to lose or gain. |
| Macro calculator | Daily protein, carb and fat grams from your calorie target. |
| Sleep calculator | Best bedtime or wake-up time using 90-minute sleep cycles. |
| Calorie deficit | Daily calories for safe weight loss and time to reach your goal. |
| Corrected calcium | Adjust a total calcium result for a low or high albumin level. |
| Body fat calculator | Body fat % from tape measurements or BMI, with healthy ranges. |
Using these calculators
These tools are for general information only and are not medical advice. Speak to your GP or a pharmacist about your health.