Health & Fitness
Body, fitness and wellbeing calculators.
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BAC Estimator Widmark blood alcohol concentration estimate from drinks and weight.
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Body Fat % (US Navy Method) Estimate body fat percentage from neck, waist (and hip) measurements.
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Caffeine Half-Life Tracker Project caffeine in your system over time from a list of doses.
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Calories Burned by Activity Estimate calories burned via the MET (metabolic equivalent) table.
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Carb Loading Calculator Daily carb target for endurance carb-loading in the days before an event.
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Daily Water Intake Estimator Suggested daily water intake from body weight and exercise minutes.
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Glycemic Load Calculator Glycemic Load = GI × carb grams / 100. Low/med/high categorisation.
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Heart Rate Training Zones Five training zones from your age and (optional) resting heart rate.
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Ideal Body Weight Devine, Robinson, Miller and Hamwi ideal body weight estimates.
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One-Rep Max Calculator Estimate 1RM with Epley, Brzycki and Lombardi formulas.
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Plate Loading Calculator Compute which plates to load onto a barbell to reach a target weight.
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Pregnancy Due Date Estimator Estimate due date from last menstrual period using Naegele's rule.
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Race Time Predictor Predict times across distances using Riegel's formula.
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Running Pace Calculator Pace, finish time, splits and km↔mile pace conversion.
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Sleep Cycle Calculator When to fall asleep (or wake up) to align with 90-minute sleep cycles.
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Strength Standards Lookup Approximate novice/intermediate/elite 1-rep-max for big lifts by bodyweight.
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Stride × Cadence → Pace Compute running speed and pace from stride length and cadence.
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Sweat Rate Calculator Estimate sweat rate from pre/post-exercise body weight and fluids consumed.
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TDEE & Macro Calculator BMR / TDEE from Mifflin-St Jeor plus a configurable macro split.
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VO₂ Max Estimator Estimate VO₂ max from Cooper or Rockport submaximal tests.
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Workout Volume Calculator Sum sets × reps × weight across a workout to track tonnage week-over-week.