AgeCalc Pro
Age and body-metric calculators in the browser
Health Calculators
Body and fitness numbers worked out from standard formulas: body mass index, daily calorie needs, macros, body fat estimates, due dates, sleep cycles and training paces.
These formulas describe populations, not you. Use them as a starting point and talk to a doctor or registered dietitian about anything that affects your health.
Start with these
- FitForge Covers TDEE, macros, body fat, BMR, and strength standards for training and nutrition planning.
- VitalMetrics Offers BMI, calorie needs, body fat, and pregnancy due date calculators in the browser.
- SleepCycleHub Calculates bedtimes and wake times and includes extras like naps, shift work, and jet lag recovery.
19 tools shown
Training and nutrition
Use these for workouts, body metrics, and meal planning.
Running and walking
Use these to plan pace, steps, and race or walking progress.
Sleep and recovery
Use these to plan sleep timing and recover from schedule changes.
Pet health
Use these for pet age, nutrition, and medication or toxicity guidance.
Wellness audio
Use this when you want therapeutic sound presets for focus or relaxation.
Blood and compatibility
Use this for blood type reference, compatibility, and child prediction.
Questions about Health Calculators
Is BMI a good measure?
It is a quick screening number. It doesn't distinguish muscle from fat, so athletes and older adults can be misclassified. Waist measurements add useful context.
Which calorie formula is used?
Most modern calculators use Mifflin-St Jeor, which studies have found to be the most accurate of the common equations for estimating resting energy use.