27 educational tools
Free Health & Fitness Calculators
Choose the tool that fits your question: estimate maintenance energy with the TDEE calculator, set a weight-based intake with the protein calculator, estimate pregnancy timing with the due date calculator, or browse running calculators for pace and training plans.
Equations describe estimates, not diagnoses or direct measurements. Check the method and limitations on the calculator page, and seek qualified care for health or pregnancy decisions.
Running
Convert pace and speed, plan race splits and find training ranges in the dedicated running collection.
Fitness
Estimate energy needs, body measurements, heart-rate targets and strength benchmarks using the method and inputs shown on each calculator.
BMI Calculator
Fitness
Healthy Weight Calculator
Fitness
Calorie Calculator
Fitness
BMR Calculator
Fitness
TDEE Calculator
Fitness
Body Fat Calculator
Fitness
Army Body Fat Calculator
Fitness
Ideal Weight Calculator
Fitness
Lean Body Mass Calculator
Fitness
Calories Burned Calculator
Fitness
One Rep Max Calculator
Fitness
Target Heart Rate Calculator
Fitness
Pregnancy
Estimate dates and pregnancy weight ranges for planning, then rely on your care team for clinical dating and individualized guidance.
Nutrition
Explore calorie and macronutrient targets, including protein, carbohydrate and fat estimates based on your selected goal and activity.
Other
Find educational estimates for body surface area, kidney filtration, blood alcohol concentration and body measurements, with limitations explained on each page.
No matching calculator found.