BMI calculator
For mass relative to squared height; this measure does not replace a medical assessment.
16 tools
Fitness calculators
Fitness calculators help estimate body mass index, daily calories, running pace and approximate strength levels. Use them as simple planning tools, not as medical or coaching advice.
All in section
All calculators Fitness Popular
BMI calculator
Calculate body mass index from height and weight.
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Fitness Popular
Calorie calculator
Estimate daily calories and macronutrients from body data and activity.
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Fitness
Body fat percentage calculator
Historical body-fat estimate from height and circumferences, using branch-specific measurement sites.
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Fitness
Running pace calculator
Calculate running pace, speed and race time predictions.
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Fitness
One-rep max calculator
Estimate one-rep max from weight and repetitions.
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Fitness
Exercise calorie calculator
Gross session calories from MET, with a 1 MET reference and its difference over the same time.
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Fitness
Barbell plate calculator
Which plates to load on each side to reach a target weight.
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Fitness
Bike gear ratio calculator
Bicycle gear ratio and the distance covered per pedal revolution.
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Fitness
Bicycle wheel size calculator
Estimate wheel geometry from ETRTO, or calculate it from a measured outside diameter.
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Fitness
Calories from macros calculator
Energy from macro grams using 4/9/4 and calorie shares, with fibre and labelling limits.
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Fitness
Ideal weight calculator
Compare Devine, Robinson, Miller and Hamwi with adult BMI boundaries, without prescribing a target.
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Fitness
Maximum heart rate calculator
Age-based pulse estimates and percentages of maximum or reserve, with formula population limits.
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Fitness
Steps to distance and calories calculator
Distance from step count and measured length or height; energy from an explicit editable coefficient.
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Fitness
VO2 max calculator
Two empirical VO₂max estimates from existing Cooper or pulse data, with applicability limits.
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Fitness
Waist ratio calculator
WHtR and WHR with measurement protocol and conditional NICE adult-screening boundaries.
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Fitness
Fluid estimate calculator
Educational fluid estimate from explicit weight, activity and heat assumptions, not a drinking requirement.
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Which calculation to choose
Running pace calculator
For distance, elapsed time and running pace; time per kilometre differs from speed.
What to prepare
For BMI, prepare height and mass in the stated units; for running, use distance and total elapsed time for the same section.
Common mistake
Do not turn a calculated measure into a diagnosis or safe exercise limit. Minutes per kilometre are not kilometres per hour.
Popular calculators
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FAQ
Is this medical advice?
No. Fitness and body metrics are general estimates. Ask a professional for medical or training decisions.
Can I use metric units?
Yes. The current calculators use metric inputs such as kilograms, centimeters and kilometers.
Are running predictions exact?
No. Pace predictions are estimates and depend on training, terrain, weather and recovery.
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