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Health & Fitness Calculators

96 calculators.

1 BMIEstimate body mass index from weight and height, a quick screening number, not a full health picture.2 BMI PrimeExpress BMI as a ratio to the upper healthy limit of 25, so 1.0 marks that boundary.3 BMI Value CalculatorFind BMI from weight and height.4 BMI Height CalculatorFind height in metres from BMI and weight.5 Health BMI Calculator 2Find health BMI from weight and height.6 Health Bmi CalculatorFind health BMI from weight and height.7 Calories Burned RunningEstimate running energy use from weight, time and running intensity.8 Calories Burned WalkingEstimate walking energy use from weight, distance and walking speed.9 Carb Grams From CaloriesConvert a carbohydrate calorie share into grams for meal planning.10 Cycling Calories BurnedEstimate cycling energy use from weight, time and riding effort.11 Daily Calorie NeedsTurn a maintenance estimate into a daily target for losing, maintaining or gaining weight.12 Daily Calories CalculatorEstimate daily calories from weight.13 Walking Calories CalculatorEstimate calories burned walking.14 Calories Burned CalculatorEstimate calories burned from minutes and rate.15 Health Calorie CalculatorFind health calories from meals and calories each.16 Exercise Calories CalculatorFind exercise calories from minutes and calories per minute.17 Body Fat Estimate (Navy Method)Estimate body fat percentage from tape measurements using the US Navy circumference method.18 Body Fat CalculatorFind body fat from weight and fat weight.19 Heart Rate ZonesSplit exercise intensity into five heart-rate zones from age-based maximum heart rate.20 Max Heart RateEstimate maximum heart rate two ways: the classic 220 minus age and the Tanaka formula.21 Target Heart RateFind a target heart rate for a chosen intensity using the Karvonen method with resting heart rate.22 Heart Rate Zone CalculatorFind 60 percent of maximum heart rate.23 Heart Rate CalculatorFind heart rate from beats and minutes.24 Water IntakeEstimate daily water intake from body weight, with extra for exercise.25 Water Bottles CalculatorFind water bottles needed for daily litres.26 Health Water CalculatorFind health water from hours and ml per hour.27 Health Water Score CalculatorFind health water score from days and score each.28 Water Needs CalculatorFind water needs from weight and ml per kg.

Frequently asked questions

What are Health & Fitness calculators?

Health & Fitness calculators on BuildCalc are free tools that give instant results from the numbers you enter.

Are Health & Fitness calculators free?

Yes, all Health & Fitness calculators are free, with no sign-up and no download.

How do I use a Health & Fitness calculator?

Open a calculator from the list, enter your numbers, and read the instant result.

29 BMREstimate basal metabolic rate, the energy used at rest, with the Mifflin-St Jeor equation.30 Bedtime From Wake TimeWork backwards from a wake time in whole 90-minute sleep cycles to find a bedtime.31 Cycling Speed and TimeConvert between cycling distance, time and average speed in one step.32 Hydration After ExerciseEstimate fluid to drink after exercise from weight lost during the session.33 Ideal Weight (Devine Estimate)Estimate a reference weight with the Devine formula, shown as a range because one number is misleading.34 Lean Body MassEstimate lean body mass from total weight and body fat percentage.35 Macro SplitSplit daily calories into protein, carbohydrate and fat grams from percentage targets.36 One-Rep Max EstimateEstimate a one-repetition maximum from a lighter set using the Epley formula.37 Protein NeedsEstimate daily protein in grams from body weight and activity level.38 Running PaceWork out pace per kilometre and speed from a run's distance and time.39 Running TimePredict how long a run will take from distance and target pace.40 Sleep CyclesTurn a sleep duration into 90-minute sleep cycles and nearby cycle-friendly durations.41 Sleep Debt (Rough)Add up the shortfall when nightly sleep falls below what you need, over several nights.42 Step DistanceConvert a step count into distance using an estimated stride length.43 TDEEEstimate total daily energy expenditure by multiplying BMR by an activity factor.44 Waist-to-Height RatioDivide waist by height; keeping the result under 0.5 is a common rough guide.45 Waist-to-Hip RatioDivide waist by hip measurement for a simple fat-distribution indicator.46 Walking TimeWork out how long a walk will take from distance and walking speed.47 Sleep Hours CalculatorFind sleep hours from bedtime and wake time in hours.48 Steps to Kilometres CalculatorConvert steps to kilometres.49 Ideal Weight CalculatorEstimate ideal weight from height.50 Steps Per Day CalculatorFind steps per day from weekly steps.51 Sleep Needed CalculatorFind sleep needed for a week.52 Workout Time CalculatorFind workout time from sessions and minutes.53 Weight Loss CalculatorFind weight loss from start and current weight.54 Weight Gain CalculatorFind weight gain from start and current weight.55 Health Weight CalculatorFind health weight change percent from start and current.56 Health Height CalculatorFind health height in metres from cm.57 Health Steps CalculatorFind health steps from days and steps per day.58 Health Exercise CalculatorFind health exercise from weeks and sessions per week.59 Health Sleep Calculator 2Find health sleep from weeks and hours per week.60 Health Heart CalculatorFind health heart beats from minutes and bpm.61 Health Blood CalculatorFind health blood pressure average from systolic and diastolic.62 Health Running Calculator 2Find health running calories from km and calories per km.63 Health Cycling Calculator 2Find health cycling calories from hours and calories per hour.64 Health Swimming Calculator 3Find health swimming calories from laps and calories per lap.65 Health Walking Calculator 2Find health walking steps from minutes and steps per minute.66 Health Yoga Calculator 3Find health yoga calories from sessions and calories each.67 Health Gym Calculator 3Find health gym calories from sessions and calories each.68 Health Diet Calculator 2Find health diet calories from days and calories per day.69 Health Protein Calculator 2Find health protein from meals and grams each.70 Health Vitamin CalculatorFind health vitamin amount from tablets and mg each.71 Health Rest CalculatorFind health rest hours from days and hours per day.72 Final Health CalculatorFind final health score from diet and exercise scores.73 Extra Health CalculatorFind extra health steps from months and steps per month.74 Health Pushup CalculatorFind health pushups from sets and pushups each.75 Health Squat CalculatorFind health squats from sets and squats each.76 Health Plank CalculatorFind health plank seconds from sets and seconds each.77 Health Jogging CalculatorFind health jogging distance from days and km per day.78 Health Stretch CalculatorFind health stretch minutes from days and minutes per day.79 Health Meditation CalculatorFind health meditation minutes from days and minutes per day.80 Health Dance CalculatorFind health dance calories from hours and calories per hour.81 Health Hike CalculatorFind health hike distance from days and km per day.82 Health Blood CalculatorFind health blood pressure average from systolic and diastolic.83 Health Heart CalculatorFind health heart beats from minutes and beats per minute.84 Health Breath CalculatorFind health breaths from minutes and breaths per minute.85 Health Flex CalculatorFind health flex minutes from sessions and minutes each.

Other tools

86 Health Weight CalculatorFind health weight change from start and current weight.87 Health Height CalculatorFind health height in cm from feet.88 Health Step CalculatorFind health step distance from steps and km per step.89 Health Run CalculatorFind health run calories from km and calories per km.
90 Health Lift CalculatorFind health lift total from sets and kg each.91 Health Sleep Score CalculatorFind health sleep score from nights and score each.
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92 Blood Pressure CalculatorFind blood pressure difference from systolic and diastolic.93 Lean Mass CalculatorFind lean mass from total weight and fat weight.94 Step Goal CalculatorFind step goal percent from steps and goal.95 Weight Change CalculatorFind weight change from start and current weight.96 Health Score CalculatorFind health score from exercise and sleep scores.