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Free Health & Fitness Calculators

Use health and fitness calculators for quick educational estimates about body measurements, nutrition, pace, pregnancy dates, and wellness planning. The results are helpful for learning and planning, but they are not a diagnosis or a replacement for a qualified professional.

Use health estimates carefully

These calculators are best for learning ranges, comparing inputs, and planning questions to ask a professional. Results depend heavily on age, body, activity, history, and local guidance.

I want a basic body-size estimateCalculate BMI and read what the category can and cannot tell you.I am estimating caloriesCompare daily calorie needs from age, size, activity, and goal assumptions.I am checking pregnancy datesEstimate due dates from last period, conception, IVF, or ultrasound date.I need a kidney estimate explainedUse eGFR education carefully and confirm medical meaning with a clinician.
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Guides that explain the limits

Health estimates need plain limits because a result can be useful and still not be medical advice. These guides explain what the number can and cannot tell you.

Priority guides

BMI guideHeight, weight, category meaning, adult screening limits, and when BMI is not enough.Calorie guideAge, height, weight, activity, goal settings, and why calorie estimates vary.Due date guideLMP, conception, IVF, ultrasound dates, and why clinicians may adjust the date.GFR guideKidney estimate inputs, lab context, and why medical follow-up matters.

Health estimate pages to keep visible

Use these links as quick paths to educational estimates with visible limits and professional-advice cautions.

Useful shortcuts

Calories Burned CalculatorEstimate exercise calories from MET, body weight, and duration while reading the limits.

What this category helps with

  • Fitness, nutrition, pregnancy, kidney, alcohol, and body-measurement estimates with visible limits.
  • Educational calculators that explain inputs and formulas without turning estimates into diagnoses.
  • Guide links and source notes for topics where context matters.

Start with these tools

BMI CalculatorEstimate adult body mass index and healthy BMI weight range.Underweight BMI CalculatorCheck adult BMI against the underweight screening threshold with careful safety notes.Overweight BMI CalculatorCheck adult BMI against overweight and obesity screening categories.Nutrition Points CalculatorCreate a transparent food-label score from calories, saturated fat, added sugar, sodium, fiber, and protein.Calorie CalculatorEstimate daily calories from BMR, activity level, and goal.Body Fat CalculatorEstimate body fat percentage with a Navy-style tape method.

All health and fitness calculators

Open a tool, try the examples, then use the matching guide when you need more explanation.

BMI CalculatorEstimate adult body mass index and healthy BMI weight range.
Nutrition Points CalculatorCreate a transparent food-label score from calories, saturated fat, added sugar, sodium, fiber, and protein.
BMR CalculatorEstimate resting calories with the Mifflin-St Jeor equation.
Pace CalculatorCalculate running, walking, or cycling pace and speed from time and distance.
Pregnancy CalculatorEstimate due date, pregnancy week, conception timing, and trimester from LMP.
Period CalculatorPredict upcoming period dates from cycle length and period length.
Macro CalculatorSplit daily calories into protein, fat, and carbohydrate grams.
Protein CalculatorEstimate protein grams per day from body weight and target factor.
TDEE CalculatorEstimate daily maintenance calories from BMR and activity level.
GFR CalculatorEstimate adult eGFR from serum creatinine with the 2021 CKD-EPI race-free equation.
Body Type CalculatorEstimate a broad body-shape category from shoulder, bust, waist, and hip measurements.
BAC CalculatorEstimate blood alcohol concentration with a Widmark-style formula.
Height CalculatorEstimate adult height from parent heights with a rough expected range.
Sleep CalculatorFind a bedtime or wake-up time from 90-minute sleep cycles and a fall-asleep buffer.

Guides for this category

Each guide uses its matching tool, with example numbers and plain limits.