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UK fitness, body & diet tools

FitCalcs

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Fitness and diet calculators that show their working.

Calorie and TDEE, BMI and waist-to-height, macros and protein, running pace and race prediction. Each tool names the equation it uses and is benchmarked against official UK datasets, so the result is one you can check.

The tools
Responsive in-content unit
Popular this week
  • How many calories to lose weight3.4k
  • BMI calculator (NHS bands)2.0k
  • How much protein do I need1.6k
  • Couch to 5k pace guide910
  • Marathon time predictor680
“Every result names the equation it uses — Mifflin-St Jeor, Karvonen, Riegel — so you can check the maths yourself.”On method, FitCalcs editorial
FitCalcs · Operated by Best Business Loans Ltd (16833937).
Sources: NHS Health Survey for England, Sport England, NDNS. Informational only, not medical advice.

Fitness and diet calculators that show their working.

Calories, macros, BMI and pace — each names its equation.

Calorie & TDEE

Daily burn via Mifflin-St Jeor.

BMI & waist-to-height

Two reads, with the NHS bands.

Macro calculator

Protein, carbs and fat for your goal.

Protein calculator

Daily grams by weight and activity.

Running pace

Pace, time and distance, converted.

Race-time predictor

Riegel: a 5k time into a marathon.

Popular this week

  • How many calories to lose weight3.4k
  • BMI calculator (NHS bands)2.0k
  • How much protein do I need1.6k
  • Couch to 5k pace guide910
300 × 250 / responsive
Built on official dataNHS Health Survey, Sport England, NDNS.
Shows the equationEvery result names its formula.
Not medical adviceEstimates to guide you, not diagnose.
FitCalcs · Operated by Best Business Loans Ltd (16833937). Sources: NHS Health Survey for England, Sport England, NDNS. Informational only, not medical advice.
UK fitness, body & diet tools

Know your numbers.

Calories, macros, BMI and pace — each names its equation.

The calculators
Responsive in-content unit
Popular this week
How many calories to lose weightBMI calculator (NHS bands)How much protein do I needCouch to 5k pace guide
Built on official dataNHS Health Survey, Sport England, NDNS.
Shows the equationEvery result names its formula.
Not medical adviceEstimates to guide you, not diagnose.