Evidence-based calculators for nutrition, fitness, and wellness — all running privately in your browser with no data stored.
Suite Size
30
health calculators
Calculate Basal Metabolic Rate using the Mifflin-St Jeor equation. See TDEE and calorie targets by goal.
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Calculate Total Daily Energy Expenditure based on your activity level. Includes cut, maintenance, and bulk targets.
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Find your daily calorie intake for weight loss, maintenance, or muscle gain with macro breakdown.
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Calculate daily protein, carbohydrate, and fat targets based on your calorie goals and body weight.
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Estimate body fat percentage using the US Navy circumference method. Supports metric and imperial.
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Calculate ideal body weight using Devine, Robinson, Miller, and Hamwi formulas with BMI-based range.
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Calculate lean body mass (fat-free mass) using Boer, James, and Hume formulas.
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Calculate daily water needs based on weight, age, activity level, climate, and pregnancy status.
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Calculate estimated delivery date using Naegele's rule. See pregnancy milestones and trimester dates.
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Calculate ovulation date and fertile window for 1–6 cycles based on last period and cycle length.
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Find out how many weeks pregnant you are from LMP. Includes baby size comparisons and trimester progress.
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Predict next period, fertile window, and ovulation dates for upcoming cycles. Identifies current cycle phase.
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Predict a child's adult height using the mid-parental height method. Optional current measurements improve accuracy.
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Calculate running pace, finish time, or distance. Get race predictions for 5K, 10K, half marathon, and marathon.
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Calculate 1RM from any weight and rep count using 6 validated formulas. Includes training percentage table.
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Find your 5 training heart rate zones using Simple % Max HR or Karvonen HRR method.
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Find the best bedtime or wake-up time aligned to 90-minute sleep cycles for waking refreshed.
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Estimate Blood Alcohol Content using the Widmark formula. Enter drinks, weight, and time to check impairment level.
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Calculate the financial and life cost of smoking. See yearly savings and years of life lost per cigarette.
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Convert your dog's age to human years using size-adjusted veterinary data. Includes year-by-year chart and life stage.
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Calculate calories burned during 50+ exercises using MET values. Compare activities and see food calorie equivalents.
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Calculate WHR and assess cardiovascular risk using WHO classification. Supports cm and inches for men and women.
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Convert your cat's age to human years using AAHA veterinary guidelines. Full chart from kitten to geriatric with life stage descriptions.
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Convert steps to miles and kilometers. Calculate calories burned based on height, weight, and pace. Progress toward daily step goals.
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Check blood type compatibility for transfusions and organ donation. Full ABO + Rh factor matrix for all 8 blood types.
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Calculate the best times to wake up or go to sleep based on 90-minute sleep cycles. Optimize for 4, 5, or 6 complete cycles.
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Track your menstrual cycle and predict your next period, fertile window, and ovulation date. 3-month forecast calendar.
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Calculate your daily protein needs based on weight, activity level, and fitness goal. See per-meal breakdown and food sources.
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Calculate daily calorie needs for dogs and cats using RER formula. All life stages: puppy, adult, senior, pregnant, nursing.
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Calculate calories needed to lose weight. Get BMR, TDEE, daily calorie goal, and weeks to target weight using Mifflin-St Jeor.
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