Army Body Fat Calculator
Estimate body fat percentage using the U.S. Army body fat method based on circumference measurements.
51 free calculators
Health and lifestyle calculators based on science
BMI, calories, macros, pregnancy, and more - accurate formulas, plain English results.
Baby Growth Percentile Calculator
Estimate baby weight, length, and head circumference screening centiles.
BAC Calculator
Estimate blood alcohol concentration from drinks, body weight, sex, and time elapsed.
BMI Calculator
Calculate your body mass index using height and weight, with BMI category interpretation.
BMR Calculator
Calculate your basal metabolic rate using age, sex, height, and weight.
Body Fat Percentage Calculator
Estimate body fat percentage using the US Navy body fat formula.
Body Surface Area Calculator
Calculate body surface area from height and weight using common BSA formulas.
Body Type Calculator
Estimate body type from simple body measurements and explain common somatotype categories.
Calorie Calculator
Estimate daily calorie needs for maintenance, weight loss, and weight gain using BMR and activity level.
Calorie Deficit Calculator
Calculate a daily calorie deficit, target calories, and estimated time to reach a weight goal.
Calorie Needs Calculator
Calculate daily calorie targets for weight loss, maintenance, or weight gain.
Calories Burned Calculator
Estimate calories burned during exercise using activity type, body weight, and duration.
Calories Burned Cycling Calculator
Estimate calories burned cycling for road, mountain, hybrid, and indoor rides.
Calories Burned Running Calculator
Estimate calories burned running from weight, distance, pace, and MET intensity.
Calories Burned Walking Calculator
Calculate calories burned walking from weight, distance, speed, time, and approximate steps.
Carbohydrate Calculator
Calculate daily carbohydrate targets based on calories, protein, fat, and fitness goal.
Child BMI Calculator
Calculate BMI for children and estimate an age-adjusted screening centile.
Conception Calculator
Estimate fertile window and possible conception dates from last period, cycle length, or due date.
Conception Date Calculator
Estimate an approximate conception date and likely conception window from due date or last period.
Due Date Calculator
Estimate pregnancy due date from last period, conception date, IVF date, or ultrasound date.
Fat Intake Calculator
Calculate daily fat intake in grams based on calories and dietary fat percentage.
Food Calorie Calculator
Build a meal from common UK foods and estimate total calories, protein, carbs, and fat.
GFR Calculator
Estimate glomerular filtration rate using serum creatinine, age, and sex with the CKD-EPI 2021 equation.
Healthy Weight Calculator
Calculate a healthy weight range for your height using the standard healthy BMI range.
Ideal Body Weight Calculator
Compare ideal body weight estimates using Devine, Robinson, Miller, and BMI methods.
Ideal Weight Calculator
Estimate ideal body weight using height and sex with the Devine formula.
Keto Calculator
Estimate ketogenic diet calories, fat, protein, and net carb macro targets.
Lean Body Mass Calculator
Calculate lean body mass from body weight and body fat percentage.
Macro Calculator
Calculate daily protein, carbohydrate, and fat targets based on calories, body weight, and goal.
Net Carb Calculator
Calculate net carbohydrates from total carbs, fibre, and sugar alcohols.
One Rep Max Calculator
Estimate your one rep max using weight lifted and reps performed.
Ovulation Calculator
Estimate ovulation date and fertile window from last period date and cycle length.
Pace Calculator
Calculate running, walking, or cycling pace from distance and time.
Period Calculator
Estimate next period date, cycle dates, ovulation date, and fertile window.
Pregnancy Calculator
Estimate due date, gestational age, trimester, conception date, and days remaining in pregnancy.
Pregnancy Conception Calculator
Estimate possible conception date from due date, last period, or ultrasound dating.
Pregnancy Weight Gain Calculator
Estimate recommended pregnancy weight gain range based on pre-pregnancy BMI and pregnancy type.
Protein Calculator
Calculate daily protein intake based on body weight, activity level, and fitness goal.
Protein Intake Calculator
Estimate daily protein intake based on weight, age, activity, and nutrition goal.
Rowing Calorie Calculator
Estimate calories burned on a rowing machine using body weight, workout duration, and intensity.
Running Pace Calculator
Calculate running pace, speed, and race finish times from distance and time.
Sleep Calculator
Find suggested bedtimes or wake times using 90-minute sleep cycle estimates.
Steps to Miles Calculator
Convert steps to miles, kilometres, stride length, and estimated calories burned.
Swimming Calorie Calculator
Estimate calories burned swimming by body weight, duration, stroke, and distance.
Target Heart Rate Calculator
Calculate target heart rate zones for exercise using age and resting heart rate.
TDEE Calculator
Estimate your total daily energy expenditure from BMR and activity level
Vitamin D Calculator
Estimate vitamin D from UK sunlight exposure and compare against NHS supplement guidance.
Waist to Height Ratio Calculator
Calculate waist to height ratio and check whether waist is less than half height.
Waist to Hip Ratio Calculator
Calculate waist to hip ratio and compare against common adult risk categories.
Water Intake Calculator
Estimate daily water intake based on body weight and activity level.
Weight Loss Calculator
Estimate daily calories, calorie deficit, and time to reach a target weight.
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Browse Health calculators and resources
Use these links to move quickly between the most useful calculators, topic groups, guides, and official resources for this category.
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Useful resources
- NHS healthy weight advice
NHS guidance on weight, food, activity, and healthy changes.
- NHS pregnancy guide
Official NHS pregnancy information and week-by-week guidance.
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Calories Burned
Fitness Tools
- Baby Growth Percentile Calculator
- Child BMI Calculator
- Ideal Body Weight Calculator
- Lean Body Mass Calculator
- One Rep Max Calculator
- Running Pace Calculator
Nutrition Tools
Fitness
- Army Body Fat Calculator
- BMI Calculator
- BMR Calculator
- Body Fat Percentage Calculator
- Body Surface Area Calculator
- Body Type Calculator
Nutrition
Medical
Pregnancy
- Conception Calculator
- Conception Date Calculator
- Due Date Calculator
- Ovulation Calculator
- Period Calculator
- Pregnancy Calculator