Health Calculators
BMI, calorie, macro and body metric calculators built on trusted formulas used by clinicians and coaches.
BMI CalculatorCalculate your Body Mass Index with age and sex for a clearer, more personal reading of your weight.BMR CalculatorEstimate your Basal Metabolic Rate — the calories your body burns at complete rest.TDEE CalculatorFind your Total Daily Energy Expenditure — the calories you burn each day including activity.Calorie CalculatorWork out how many calories you should eat per day to lose, maintain or gain weight.Macro CalculatorSplit a daily calorie target into protein, carbohydrate and fat grams.Water Intake CalculatorEstimate how much water you should drink each day based on your weight and activity.Ideal Weight CalculatorEstimate your ideal body weight using the Devine, Robinson, Miller and Hamwi formulas.Body Fat Percentage CalculatorCalculate your body fat percentage, fat mass, and lean mass using the U.S. Navy method.Lean Body Mass CalculatorEstimate your lean muscle mass using the Boer, James, and Hume formulas.One Rep Max CalculatorCalculate your maximum 1RM bench press, squat, or deadlift and rep percentages.Pace CalculatorCalculate running, walking, or cycling pace per kilometer and per mile.Running Pace CalculatorPredict 5k, 10k, Half Marathon, and Marathon finish times and target running paces.Heart Rate Zone CalculatorCalculate your max heart rate and 5 target training zones using the Karvonen formula.Pregnancy Due Date CalculatorCalculate your estimated due date, current gestational week, and trimester timeline.Ovulation CalculatorEstimate your ovulation day, fertile window, and upcoming period dates.Protein Intake CalculatorCalculate your daily protein intake requirement in grams for muscle gain, cutting, or endurance.Creatinine Clearance CalculatorEstimate creatinine clearance (CrCl) and eGFR using Cockcroft-Gault equation.
Answers
Health calculator FAQs
What health calculators are available here?
You can check your BMI, estimate daily calories with the calorie calculator and TDEE calculator, set nutrition targets with the macro calculator, and find your daily water intake.
How do I calculate my BMI?
BMI is your weight in kilograms divided by your height in metres squared (kg ÷ m²). The BMI calculator works in metric or imperial units and tells you which category you fall into.
How many calories should I eat per day?
Your daily need equals your total daily energy expenditure (TDEE). Find it with the TDEE calculator, then set a target for losing, maintaining or gaining weight using the calorie calculator.
Are these health calculators a substitute for medical advice?
No. These tools give general estimates using well-established formulas for information only. They are not medical advice — always consult a qualified healthcare professional before making health decisions.
How much water should I drink each day?
Daily water needs depend on your body weight, activity level and climate, but a common guide is around 2–3 litres. The water intake calculator gives you a personalised target.
All health calculators
BMI, calorie, macro and body metric calculators built on trusted formulas used by clinicians and coaches.
- BMI Calculator — Calculate your Body Mass Index with age and sex for a clearer, more personal reading of your weight.
- BMR Calculator — Estimate your Basal Metabolic Rate — the calories your body burns at complete rest.
- TDEE Calculator — Find your Total Daily Energy Expenditure — the calories you burn each day including activity.
- Calorie Calculator — Work out how many calories you should eat per day to lose, maintain or gain weight.
- Macro Calculator — Split a daily calorie target into protein, carbohydrate and fat grams.
- Water Intake Calculator — Estimate how much water you should drink each day based on your weight and activity.
- Ideal Weight Calculator — Estimate your ideal body weight using the Devine, Robinson, Miller and Hamwi formulas.
- Body Fat Percentage Calculator — Calculate your body fat percentage, fat mass, and lean mass using the U.S. Navy method.
- Lean Body Mass Calculator — Estimate your lean muscle mass using the Boer, James, and Hume formulas.
- One Rep Max Calculator (1RM) — Calculate your maximum 1RM bench press, squat, or deadlift and rep percentages.
- Pace Calculator — Calculate running, walking, or cycling pace per kilometer and per mile.
- Running Pace Calculator — Predict 5k, 10k, Half Marathon, and Marathon finish times and target running paces.
- Heart Rate Zone Calculator — Calculate your max heart rate and 5 target training zones using the Karvonen formula.
- Pregnancy Due Date Calculator — Calculate your estimated due date, current gestational week, and trimester timeline.
- Ovulation Calculator — Estimate your ovulation day, fertile window, and upcoming period dates.
- Protein Intake Calculator — Calculate your daily protein intake requirement in grams for muscle gain, cutting, or endurance.
- Creatinine Clearance Calculator — Estimate creatinine clearance (CrCl) and eGFR using Cockcroft-Gault equation.