Health tools

Calculate body mass index from weight and height. BMI is a screening number, not a diagnosis, and it does not account for muscle, age or body shape.

Estimate basal metabolic rate for men using the Mifflin-St Jeor equation. BMR is the energy your body uses at rest, shown here in calories per day.

Estimate basal metabolic rate for women using the Mifflin-St Jeor equation. BMR is the energy your body uses at rest, shown here in calories per day.

Get a rough daily water target from body weight using a common rule of thumb of 35 mL per kilogram. Needs rise with heat, exercise and illness.

Estimate a baseline protein intake from body weight using 0.8 grams per kilogram. Athletes, older adults and some conditions need more, so ask a…

Estimate maximum heart rate with the common 220 minus age formula and see training zones as percentages. It is an average and individual rates vary.

Estimate an ideal body weight for men with the Devine formula, which adds weight for each inch of height above five feet. Treat it as a rough guide…

Estimate an ideal body weight for women with the Devine formula, which adds weight for each inch of height above five feet. Treat it as a rough…

Calculate waist-to-hip ratio from two tape measurements. It is one indicator of where body fat is carried and is best read alongside other health…

Estimate the heaviest weight you could lift once from a lighter set, using two common formulas. Enter weight lifted and repetitions to see epley…

Estimate how many days and weeks a weight loss goal takes at a steady daily calorie deficit, using 7,700 kcal per kilogram. Enter weight to lose and…

Estimate total daily energy expenditure for men by multiplying Mifflin-St Jeor BMR by an activity factor. Enter weight, height, age and activity…

Estimate total daily energy expenditure for women by multiplying Mifflin-St Jeor BMR by an activity factor. Enter weight, height, age and activity…

Turn a daily calorie target and a macro split into grams of carbohydrate, protein and fat. Enter daily calories, carbs, protein and fat to see…

Estimate body surface area from height and weight using the Mosteller formula, used in some medical dosing. Enter weight and height to see bsa…

Estimate lean body mass for men with the Boer formula, and the fat share of total weight that implies. Enter weight and height to see lean body mass…

Estimate lean body mass for women with the Boer formula, and the fat share of total weight that implies. Enter weight and height to see lean body…

Calculate waist-to-height ratio, a simple screening measure that compares waist size with height. It is a general guide only and not a diagnosis.…

Estimate body fat percentage for men from waist, neck and height tape measurements using the US Navy method. Enter waist, neck and height to see…

Estimate body fat percentage for women from waist, hip, neck and height tape measurements using the US Navy method. Enter waist, hip, neck and…

Find a training heart rate at a chosen intensity using heart rate reserve, which allows for your resting pulse. Enter age, resting heart rate and…

Estimate calories burned in an activity from body weight, the activity's MET value and the time spent. Enter weight, met value of the activity and…

Convert a step count into kilometres and miles using your average stride length. Enter steps and stride length to see distance and distance in miles…

Work out the pace you need to finish a 800 m run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see pace…

Work out the pace you need to finish a 1500 m run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see pace…

Work out the pace you need to finish a 1 mile run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see pace…

Work out the pace you need to finish a 3 km run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see pace per…

Work out the pace you need to finish a 5 km run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see pace per…

Work out the pace you need to finish a 10 km run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see pace…

Work out the pace you need to finish a 15 km run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see pace…

Work out the pace you need to finish a 10 mile run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see pace…

Work out the pace you need to finish a Half Marathon run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see…

Work out the pace you need to finish a Marathon run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see pace…

Work out the pace you need to finish a 50 km run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see pace…

Work out the pace you need to finish a 100 km run in a target time. Enter your finish time in minutes (7.5 means 7 minutes 30 seconds) to see pace…

Predict your 800 m finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see the…

Predict your 1500 m finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see the…

Predict your 1 mile finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see the…

Predict your 3 km finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see the…

Predict your 5 km finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see the…

Predict your 10 km finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see the…

Predict your 15 km finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see the…

Predict your 10 mile finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see the…

Predict your Half Marathon finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see…

Predict your Marathon finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see the…

Predict your 50 km finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see the…

Predict your 100 km finish time from the pace you can hold. Enter your pace per kilometre in minutes (5.5 means 5 minutes 30 seconds) to see the…