Health and Fitness

Health and Fitness calculators help you track body and wellness metrics — BMI and body composition, daily calorie needs, and a range of clinical indices. Popular tools include the BMI Calculator, TDEE Calculator, Reverse BMI (Height) Calculator, HOMA-IR Calculator, and Prostate Volume Calculator.

Enter your measurements for an instant estimate, or open the Trending tab to see what others are tracking this week. Every calculator is free and works on any device.

  • Pediatric GFR Calculator
    Estimate glomerular filtration rate in children using the bedside Schwartz equation from height and serum creatinine. Free pediatric eGFR tool.
  • Insulin Sensitivity Factor Calculator
    Estimate your insulin sensitivity factor (correction factor) using the 1800, 1700 or 1500 rule from your total daily insulin dose, in mg/dL or mmol/L.
  • Insulin Dose Calculator
    Estimate a mealtime insulin bolus from carbs, your insulin-to-carb ratio, current and target blood glucose, and correction factor. Educational use only.
  • Drug Dosage Calculator
    Calculate weight-based drug dosage in mg per dose, daily dose, and liquid volume (mL) from patient weight, dose per kg, frequency and concentration.
  • Pediatric Dose Volume Calculator
    Convert a weight-based dose (mg/kg) into the liquid volume (mL) to administer using the medication concentration. Quick, accurate dosing helper.
  • Serum Osmolality Calculator
    Calculate estimated serum osmolality (mOsm/kg) from sodium, glucose, and BUN using the standard 2×Na + Glucose/18 + BUN/2.8 formula.
  • mEq/L Calculator
    Convert mg/L to mEq/L for any electrolyte using its valence and atomic weight. Free milliequivalents per liter calculator with worked examples.
  • Drug Infusion Rate from Dose Calculator
    Calculate IV infusion pump rate in mL/hr from a weight-based dose (mcg/kg/min) and solution concentration. Fast, accurate drip rate tool for clinicians.
  • Target Heart Rate Zone Percentage Calculator
    Calculate your target heart rate at any exercise intensity percentage using your age and the 220-minus-age maximum heart rate formula.
  • mmol/L to mg/dL Calculator
    Convert mmol/L to mg/dL for glucose, cholesterol, creatinine, urea and more. Uses mg/dL = (mmol/L × MW) / 10 with selectable molecular weights.
  • mg/dL to mmol/L Calculator
    Convert mg/dL to mmol/L for glucose, cholesterol, triglycerides or any substance using its molecular weight. Fast, accurate clinical unit converter.
  • IV Drip Rate Calculator (gtt/min)
    Calculate IV drip rate in drops per minute (gtt/min) from volume, infusion time, and drop factor. Free, fast nursing flow-rate tool.
  • Percent Daily Value (%DV) Calculator
    Calculate the Percent Daily Value (%DV) of a nutrient from the amount per serving and its recommended daily value. Fast, free %DV nutrition calculator.
  • IV Infusion Rate Calculator
    Calculate IV infusion rate in mL/hr from total volume and time. Also computes drip rate (gtt/min) using a drop factor. Fast, free pump-rate tool.
  • Dose to Volume Calculator
    Convert an ordered medication dose into the volume to administer using stock concentration. Volume = Dose / Concentration. Fast, free dosage tool.
  • mg/kg Dosage Calculator
    Calculate a weight-based medication dose in mg using the mg/kg formula. Enter dose per kg and body weight (kg or lb) for instant results.
  • Weight Change Predictor Calculator
    Predict your weekly weight change from daily calorie intake vs TDEE. Estimate gain or loss in pounds and kg using the 3,500 kcal-per-pound rule.
  • Calories Burned Per Step Calculator
    Estimate calories burned walking by step count, body weight and stride length. See total kcal, calories per step and distance walked.
  • Body Fat Percentage Calculator (BMI Method)
    Estimate body fat percentage from your BMI, age and sex using the Deurenberg equation. Free calculator with fat mass and lean mass output.
  • Calories Burned Running Calculator (by Speed)
    Estimate calories burned running by speed (mph), body weight and duration using MET values. Fast, free running calorie calculator for any pace.
  • Mean Arterial Pressure (MAP) Calculator
    Calculate Mean Arterial Pressure (MAP) from systolic and diastolic blood pressure. MAP = DBP + (SBP − DBP)/3. Instant mmHg result and pulse pressure.
  • eGFR Calculator (CKD-EPI 2021)
    Estimate glomerular filtration rate with the race-free 2021 CKD-EPI creatinine equation. Enter sex, age and serum creatinine to get eGFR and CKD stage.
  • Bulking & Cutting Calorie Calculator
    Calculate your daily calorie target for bulking, cutting, or maintaining based on your TDEE. Bulk at 110-120% and cut at 75-85% of maintenance.
  • Mean Arterial Pressure (MAP) Calculator
    Calculate Mean Arterial Pressure (MAP) from your systolic and diastolic blood pressure using MAP = DBP + (SBP − DBP)/3. Free, instant.

Frequently asked questions

What can I calculate with these health and fitness tools?

Body metrics such as BMI and body-fat estimates, energy needs like BMR and TDEE, target weights and heights, and clinical indices used in health assessments.

Is this medical advice?

No. These calculators are for information and education only and are not a diagnosis or treatment plan. Always consult a qualified healthcare professional about your health.

Are they free and private?

Yes — free, no sign-up, and your inputs stay in your browser; nothing you enter is logged or shared.

How accurate are the results?

They use established formulas and reference ranges, but individual factors such as age, muscle mass, and medical history affect real values — treat results as estimates.

Which health calculators are most popular?

The list is ordered by usage, most popular first; the Trending tab shows what's rising this week.

Categories