Health Calculators

Estimate daily keto calories, fat, protein, and net carbs from weight, activity, and goal.

Estimate chronotype, corrected mid-sleep, and social jetlag from workday and free-day sleep timing.

Estimate VO2 max from a 12-minute run and turn it into heart-rate zones and a weekly training structure.

Calculate BMI from height and weight with health category.

Estimate body fat percentage using Navy and BMI-based methods.

Estimate daily calorie needs using Mifflin-St Jeor equation.

Estimate calories burned from common activities by scaling CDC reference values to body weight and duration.

Estimate cycling watts per kilo and FTP context from a rider's bodyweight and test power.

Provide adult sodium, potassium, and magnesium reference context during fasting while steering longer fasts toward me...

Track progress across body weight, strength, and running pace to summarize whether a training block improved relative...

Plan intermittent-fasting windows, meal timing, and calories per meal from common protocol presets.

Turn a daily calorie target into carbohydrate, protein, and fat grams using goal-based splits.

Show a clean daily reference profile for key vitamins and minerals based on adult life stage.

Estimate one-rep max, training max, and working-set load from a submax lift.

Estimate ovulation timing, the six-day fertile window, luteal phase length, and forecast future periods and fertile w...

Turn a race result into pace per mile, pace per kilometer, speed, and race projections.

Map total runway into build weeks, deload cadence, taper length, peak set targets, and session count for a practical ...

Convert dog or cat years into a more realistic human-equivalent age with life-stage context.

Provide a conservative, bucketed recovery calendar that helps users plan support, PTO, and return-to-activity convers...

Estimate singleton-pregnancy weight-gain ranges by gestational week using pre-pregnancy BMI bands.

Combine VO2 max, power-to-weight ratio, and basic training zones into one general athletic-performance snapshot.

Estimate maintenance calories from two established BMR formulas and standard activity multipliers.

Estimate daily beverage and total-water needs from life stage, body size, exercise time, and climate.

Compare powerlifting performance across bodyweights using both legacy Wilks and current IPF GL scoring.