Health Tools
Health Calculators
Free, science-backed tools to help you understand and improve your health — no account needed.
- Sleep CalculatorFind the best bedtime based on 90-minute sleep cycles.
- Strength CalculatorEstimate 1RM, score your overall strength level, compare lifts to standards, and analyze relative strength.
- PFT CalculatorScore the USMC Physical Fitness Test, find your classification, and plan the events to improve.
- ACFT CalculatorScore the Army Fitness Test, check pass/fail, and get a plan to improve your weakest event.
- A1C CalculatorConvert A1C to estimated average glucose (eAG) and understand blood sugar control.
- BMI CalculatorBody Mass Index with healthy weight range and category gauge.
- Calorie CalculatorDaily calorie needs for fat loss, maintenance, or muscle gain.
- Starbucks Calorie CalculatorBuild any Starbucks drink and see calories, sugar, caffeine and nutrition.
- Body Fat CalculatorEstimate body fat % using the U.S. Navy method with ACE categories.
- BMR CalculatorBasal metabolic rate and TDEE at every activity level.
- Ideal Weight CalculatorCompare Devine, Robinson, Miller and Hamwi formulas.
- Pregnancy CalculatorDue date, current week, trimester, and full 40-week timeline.
- Pregnancy Weight Gain CalculatorHealthy gain by week, BMI, and singleton vs twin pregnancy.
- Pregnancy Conception CalculatorLikely conception date and fertile window from due date, LMP, or scan.
- Due Date CalculatorDue date from LMP, ultrasound, conception date, or IVF transfer.
- Ovulation CalculatorPredict fertile window, ovulation day, next period, and conception timing.
- Conception CalculatorBest days to conceive, ovulation timing, intercourse window, and possible due date.
- Army Body Fat CalculatorEstimate body fat with the U.S. Army tape test and check age-tiered compliance.
- Lean Body Mass CalculatorEstimate LBM, fat-free mass and body fat using Boer, James and Hume formulas.
- Calories Burned CalculatorCalories burned by time or distance for 70+ workouts, sports and daily activities.
- One Rep Max CalculatorEstimate 1RM, training percentages and strength zones with Epley, Brzycki and Lombardi formulas.
- Bench Press CalculatorBench 1RM, training percentages, strength standards, plate combos and a progression planner.
- Target Heart Rate CalculatorHeart rate zones for fat burn, cardio, Zone 2, HIIT and peak performance.
- Macro CalculatorDaily calories, protein, carbs, and fat for fat loss, muscle gain, keto, and body recomp.
- Carbohydrate CalculatorDaily carb intake for fat loss, muscle gain, athletes, endurance, and keto.
- Protein CalculatorIdeal daily protein intake for muscle gain, fat loss, athletes, and healthy aging.
- Fat Intake CalculatorDaily fat intake for fat loss, muscle gain, keto, hormonal health, and performance.
- TDEE CalculatorTotal Daily Energy Expenditure with cut, maintenance, and bulk calorie targets plus macros.
- GFR CalculatorEstimate kidney function (eGFR) from serum creatinine using CKD-EPI 2021, MDRD, and Schwartz formulas.
- Height CalculatorPredict adult height (5 methods), convert between feet/cm/m, and analyse BMI with body frame.
- Heat Index CalculatorFeels-like temperature, heat-stress level, and safety guidance from humidity or dew point.
- Vision CalculatorConvert Snellen, LogMAR, and decimal acuity; get age-adjusted vision quality assessment and health insights.
- Pace CalculatorRunning pace, race time, distance, splits, and race predictions from 400 m to 100K.
- Anorexic BMI CalculatorCompare BMI with low-BMI screening ranges. Educational only — not a diagnostic tool.
- Body Type CalculatorFind your body shape (Hourglass, Pear, Apple, Rectangle, Inverted Triangle) and waist-to-hip ratio.
- BAC CalculatorEstimate blood alcohol concentration, impairment level, and how long until BAC returns to 0%.