31 tools · Health & Fitness
Health & Fitness tools
Quick calculators and plain-English habit guides.
Popular in health & fitness
Health & Fitness
BMI Calculator
Calculate Body Mass Index in metric or imperial units. See your category and what it means, in plain English.
Health & Fitness
Calorie Calculator
Estimate your daily calorie needs based on age, activity, and goals (lose, maintain, or gain). Free and private.
Health & Fitness
Daily Water Intake Calculator
Calculate how much water you should drink per day based on weight, activity, and climate. Liters and ounces.
Health & Fitness
Ideal Weight Calculator
See your ideal weight across several medical formulas (Devine, Robinson, Miller). Honest ranges, no fad claims.
Health & Fitness
Running Pace Calculator
Calculate pace, finish time, or distance for any run. Supports km and miles. Perfect for 5K, 10K, half, and marathon training.
Health & Fitness
Macro Calculator
Get your daily protein, carb, and fat targets based on calories and goals. Free, no sign-up.
More health & fitness tools
- BMR CalculatorCalculate your basal metabolic rate — calories burned at rest — using the Mifflin-St Jeor formula. Free, mobile-friendly.
- Body Fat CalculatorEstimate body fat % using the U.S. Navy tape method — waist, neck, hip measurements. Free, private, mobile-friendly.
- Pregnancy CalculatorCalculate due date, current week, and trimester from last menstrual period. Free, private, no data leaves your browser.
- Ovulation CalculatorFind your estimated ovulation date and fertile window from the last period and cycle length. Free, private, 100% in-browser.
- Steps to Calories CalculatorConvert daily walking steps into calories burned using weight, stride, and pace. Free fitness calculator.
- Smoking Cost CalculatorEnter packs per day and price — see monthly, yearly, 10-year, and lifetime cost. A gut check that helps people quit.
- Alcohol Unit CalculatorConvert any drink to standard drinks (US) or units (UK). Track a week's intake against low-risk guidelines.
- Caffeine Intake CalculatorLog coffee, tea, soda, and energy drinks and see daily caffeine in mg with the 400 mg safe-limit benchmark.
- Sleep Cycle CalculatorPick a wake-up time and see the best bedtimes aligned with 90-minute sleep cycles. Or enter bedtime, get wake times.
- Heart Rate Zone CalculatorFind your max heart rate and the five training zones (recovery, aerobic, tempo, threshold, VO2 max) in one go.
- Protein Intake CalculatorCalculate daily protein grams from body weight, activity level, and goal (cut, maintain, bulk). References IOM + ISSN guidelines.
- Carbohydrate CalculatorCalculate daily carb grams from calories, activity, and diet (balanced, low-carb, keto). Pairs with the macro calculator.
- Fiber Intake CalculatorCalculate daily fiber grams recommended by age and sex, plus tips for hitting the number from whole foods.
- Fasting TimerStart a fasting timer for 16:8, 18:6, 20:4, OMAD, or a custom schedule. Shows elapsed, remaining, and eating window.
- Meal Prep CalculatorEnter weekly macros and preferred foods; get a shopping list scaled for your target calories and portions.
- Water Intake by Body WeightCalculate daily water intake from body weight using the half-ounce-per-pound rule plus activity and climate adjustments.
- One-Rep Max CalculatorEstimate your 1RM from a set of N reps — Epley, Brzycki, Lombardi, Mayhew formulas side by side.
- Ovulation Window CalculatorFertile window, likely ovulation day, and next period estimate from last period date and cycle length.
- Electrolyte Replacement CalculatorWater, sodium, and potassium targets for endurance training — tuned to body weight, sweat rate, and climate.
- Vitamin D Dose CalculatorSuggested daily IU for maintenance or deficiency repletion — accounting for age and sun exposure.
- Calories Per Macro EstimatorTotal kcal from protein/carbs/fat/fiber plus percent breakdown — catches low-protein diets instantly.
- Jet Lag Recovery CalculatorDays to recover from jet lag based on timezones crossed and travel direction. Eastward travel is harder.
- Vegan Protein CalculatorDaily plant-based protein target with meal plans from tofu, tempeh, lentils, seitan, quinoa.
- Resistance Band Workout PlannerWeekly split + exercise list by goal, days/week, and fitness level. Beginner to advanced.
- Biohacking Supplement TrackerSupplement stack cost tracker. Monthly + yearly total, with interaction cautions and staple callouts.