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Health & Fitness Calculators

Body composition, calorie and macro targets, training numbers and pregnancy dates — using published formulas (Mifflin-St Jeor, Devine, Naegele) with the equation shown on every page. 31 tools, grouped by topic.

Reviewed by the CalcCafe editorial team · Last updated 1 July 2026 · How we test our tools

Body composition & weight

BMI, body fat, lean mass, ideal and healthy weight ranges.

  • BMI CalculatorFree BMI calculator with metric and imperial units.
  • Body Fat CalculatorEstimate body fat percentage with the US Navy circumference method.
  • Army Body Fat CalculatorEstimate body fat % using the official US Army circumference (tape) method from height, neck, waist, and…
  • Lean Body Mass CalculatorEstimate lean body mass and fat mass from weight, height, and sex using the Boer formula.
  • Ideal Weight CalculatorEstimate your ideal body weight by height and sex using the Devine, Robinson, Miller and Hamwi formulas.
  • Healthy Weight CalculatorFind your healthy weight range from height using the WHO BMI 18.5-24.9 standard.
  • Overweight CalculatorCalculate your BMI, see if you're overweight, and find out exactly how many kilograms you are above your…
  • Anorexic BMI CalculatorCalculate your BMI and see where it falls relative to the anorexia threshold (BMI under 17.5).
  • Body Type CalculatorEstimate your somatotype (ectomorph, mesomorph, or endomorph) from height, wrist, and waist using a simple…
  • Body Surface Area CalculatorCalculate Body Surface Area (BSA) from height and weight using the Mosteller and Du Bois formulas, in…

Calories & nutrition

BMR, TDEE, calorie goals and how to split them into protein, carbs and fat.

  • Calorie CalculatorEstimate your daily calorie needs using the Mifflin-St Jeor BMR formula and activity level.
  • BMR CalculatorCalculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation.
  • TDEE CalculatorCalculate your Total Daily Energy Expenditure (TDEE) with the Mifflin-St Jeor formula, plus daily calorie…
  • Macro CalculatorTurn daily calories into protein, carb, and fat grams using balanced, low-carb, high-protein, or custom…
  • Protein CalculatorEstimate your daily protein target in grams from body weight and activity goal, with a recommended range…
  • Carbohydrate CalculatorCalculate your recommended daily carbohydrate intake in grams from your total daily calories and chosen…
  • Fat Intake CalculatorCalculate your recommended daily fat intake in grams from your calorie intake and target fat percentage,…
  • Calories Burned CalculatorEstimate calories burned from any activity using MET values, your body weight, and workout duration.
  • Weight Watchers Points CalculatorEstimate food points using the classic formula: calories, fat, and fiber.

Fitness & training

Running pace, one-rep max and heart-rate zones.

  • Pace CalculatorCalculate running pace per km and per mile, plus speed, from any distance and time.
  • One Rep Max CalculatorEstimate your one-rep max (1RM) from weight and reps using the Epley and Brzycki formulas, plus a training…
  • Target Heart Rate CalculatorFind your target heart rate zones for exercise using your age and resting heart rate with the Karvonen…

Pregnancy & fertility

Due date, conception window, ovulation, cycle tracking and healthy weight gain.

  • Pregnancy CalculatorEstimate your due date, current pregnancy week and day, trimester, and days remaining from your last…
  • Due Date CalculatorEstimate your pregnancy due date from your last menstrual period using Naegele's rule.
  • Conception CalculatorEstimate your most likely conception date and fertile window from your last menstrual period (LMP) and…
  • Pregnancy Conception CalculatorEstimate your conception date and fertile window from your last menstrual period (LMP) or your due date.
  • Ovulation CalculatorEstimate your ovulation day and fertile window from your last period date and cycle length, plus the next…
  • Period CalculatorPredict your next 3 period start dates, period end dates and fertile windows from your last period, cycle…
  • Pregnancy Weight Gain CalculatorEstimate recommended pregnancy weight gain from your pre-pregnancy BMI, plus a target range for your…

Medical estimates

Blood alcohol and kidney function estimates — informational only.

  • BAC CalculatorEstimate blood alcohol concentration (BAC) using the Widmark formula from sex, body weight, drinks…
  • GFR CalculatorEstimate kidney function (eGFR) with the race-free CKD-EPI 2021 equation from serum creatinine, age, and…

Sources & references

These tools follow our methodology and provide educational estimates only — verify important figures with a qualified professional.