もっと強く生きる。
健康・フィットネス
r/Fitness、r/loseit、r/GainIt、r/running、r/weightroom、r/Stronglifts、r/sleepのコミュニティ向けのReddit発の計算機・リファレンス — BMI、水分摂取量、体脂肪率（Navy法）、理想体重、ウエストヒップ比、TDEE、消費カロリー、タンパク質必要量、マクロ配分、心拍ゾーン（カルボーネン法）、最大心拍数（田中式）、ペース変換、5kmタイムからのVO2max、1RM（Epley/Brzycki）、プレート計算、RPE→%1RM、ウォームアップセット、睡眠サイクル、カフェイン半減期、睡眠負債。
53個のツールを利用可能
体組成
BMI、体脂肪率（Navy法）、除脂肪体重、理想体重、ウエストヒップ比、水分摂取量 — r/loseit、r/Fitness、r/GainItの体組成スレッドを支える数学。
栄養
TDEE、消費カロリー、マクロ配分、体重あたりのタンパク質必要量 — r/Fitness、r/MealPrepSunday、r/EatCheapAndHealthyの栄養論争のために。
有酸素・心拍ゾーン
最大心拍数（田中式）、カルボーネン法の心拍ゾーン、ペース↔速度変換、5kmタイムからのVO2max — r/running、r/cycling、r/Rowingのために。
筋力トレーニング
1RM（Epley / Brzycki / Lombardi）、バーベルプレートの組み合わせ、RPE→%1RM、ウォームアップセットの計算 — r/weightroomとr/Stronglifts式プログレッションの土台。
睡眠・回復
90分睡眠サイクルプランナー、カフェイン半減期、睡眠負債計算機 — r/Fitnessとr/sleepのスレッドをもとに。
Wind Chill Calculator
Compute the felt-air temperature from wind speed and air temperature.
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BMI Calculator
Calculate Body Mass Index and see healthy ranges.
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Daily Water Intake Calculator
Get a personalized daily water target based on weight, activity, and climate.
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Body Fat % Calculator (Navy Method)
Estimate body-fat percentage from tape measurements and BMI.
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Ideal Weight Calculator (Devine / Hamwi / Robinson)
Compare the popular clinical ideal-weight formulas.
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Waist-to-Hip Ratio Calculator
Compute waist-to-hip ratio and the WHO health-risk band.
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TDEE & Macro Calculator
Calculate how many calories you burn per day and how to split them into protein, carbs, and fat.
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Calorie Burn Calculator
Estimate calories burned during exercise using MET formulas.
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Daily Protein Requirement Calculator
Get a protein target in g/day from body weight, lean mass, and activity.
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Macro Splitter (Carbs / Fat / Protein)
Split a calorie target into carbs, fat, and protein grams.
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Max Heart Rate Calculator (Tanaka)
Estimate HRmax from age with the Tanaka formula.
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Heart Rate Zone Calculator (Karvonen)
See your 5 training zones from resting HR and HRmax.
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Pace Converter (min/km ↔ min/mi ↔ km/h ↔ mph)
Convert running pace between metric and imperial units.
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VO2max Estimator from 5K Time
Estimate VO2max and equivalent race times from a recent 5K.
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One-Rep Max Calculator (Epley / Brzycki / Lombardi)
Estimate your 1RM from a sub-maximal set.
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Barbell Plate Loading Calculator
See exactly which plates to load on each side of the bar.
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RPE to %1RM Calculator
Convert Rate of Perceived Exertion to %1RM.
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Warm-Up Set Calculator
Build a smart warm-up ramp to your working sets.
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Sleep Cycle Calculator
Find the best bedtime or wake time based on 90-min sleep cycles.
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Caffeine Half-Life Calculator
Find out how much caffeine is still in your system at bedtime.
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Sleep Debt Calculator
See how much sleep debt you've accumulated and when you'll recover.
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Heat Index Calculator (NWS Rothfusz)
Get the felt-air temperature from heat and humidity.
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Running Pace Zones Calculator
Get easy / tempo / threshold / interval / repetition paces from a recent race or threshold pace.
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Race Time Predictor (Riegel)
Predict your 5K / 10K / half / marathon time from any other race result.
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Race Splits Calculator
Get per-mile or per-km splits to hit a goal finish time.
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Boston Qualifier Pace Calculator
What pace do you need for a Boston Qualifier at your age and gender?
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Labor Probability Estimator
Estimate the chance you'll go into labor this week.
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Heart-Rate Zone Calculator
Set Karvonen or Tanaka HR zones from age and resting HR.
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Race Time Predictor
Predict your finish time for any distance from a recent race.
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Maternity Benefit Net Pay
Estimate your net maternity benefit after the annualised tax rule.
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Cycle-Adjusted Due Date
Compute the EDD from LMP + cycle length or from a known conception date.
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NIPT False Positive Risk
What's the chance a 'high-risk' NIPT result is actually a false positive?
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赤ちゃん第一年コスト計算
都市での赤ちゃん第一年総コストを推定。
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Home Gym vs Gym Membership Calculator
Compare a home gym investment against monthly gym membership costs.
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Swimming Pace Calculator
Convert swim distance and time into per-100m pace, speed, and split times.
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Bicycle Gear Inches Calculator
Calculate gear inches, development, and cadence-speed for any chainring and cog.
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Protein Cost per Gram Calculator
Compare the price of protein sources by cost per gram of protein.
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GLP-1 Medication Cost Calculator
Estimate monthly and yearly GLP-1 medication costs from price, coupon, and insurance.
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Shift Work Sleep Schedule Calculator
Plan a sleep schedule that fits rotating or night-shift hours.
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Nicotine Cost Calculator
Estimate how much smoking or vaping costs per day, year, and lifetime.
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Therapy Cost Calculator
Estimate therapy session costs with insurance, sliding scale, or self-pay.
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IVF Cost Estimator
Estimate IVF cycle costs from clinic, medication, testing, and insurance.
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Invisalign Cost Calculator
Estimate Invisalign or clear aligner treatment from case complexity.
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Meal Prep Cost Per Serving Calculator
Calculate grocery cost per meal, batch cost, waste, and weekly budget.
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Monthly Supplement Cost Calculator
Calculate monthly supplement spend from price, servings, and frequency.
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Hearing Aid Cost Calculator
Compare hearing aid devices, fitting, follow-up, warranty, and financing.
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Urgent Care vs ER Cost Calculator
Compare urgent care and emergency department out-of-pocket costs.
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Cold Plunge Cost Calculator
Estimate a cold plunge tub, chiller, installation, and running cost.
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Weight Loss Timeline Calculator
Estimate how long reaching a weight goal takes with plateaus.
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Keto Macro Calculator
Calculate keto macros and monthly keto food cost.
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Maintenance Calories Calculator
Calculate maintenance calories and a safe deficit for weight goals.
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Baby Growth Percentile Calculator
Check baby weight and growth percentiles against WHO data.
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Fasting Window Calculator
Find a fasting window that fits your schedule and goals.
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