Every key fitness metric — one tool, zero friction
BMI計算機
ボディマス指数を計算し、健康的な体重範囲を確認しましょう。
TDEE計算機
活動レベルに基づいて1日の総エネルギー消費量を計算。
BMR計算機
基礎代謝率を計算 — 安静時の消費カロリーを把握。
体脂肪率計算機
複数の方法で体脂肪率を推定します。
理想体重計算機
身長と体格に基づいた理想的な体重範囲を確認。
カロリー計算機
減量・維持・増量のための1日のカロリー目標を計算。
マクロ栄養素計算機
目標に最適なタンパク質・炭水化物・脂質の比率を計算。
水分摂取量計算機
体重と活動量に基づいた1日の水分摂取量を計算。
心拍ゾーン計算機
最適な有酸素運動のためのトレーニング心拍ゾーンを計算。
除脂肪体重計算機
除脂肪体重と脂肪なし体重を計算。
1RM計算機
主要なリフトの1回最大挙上重量を推定。
プロテイン計算機
筋肉増強と回復に必要な1日のタンパク質摂取量を計算。
睡眠計算機
睡眠サイクルに基づいた最適な就寝・起床時間を計算。
睡眠負債計算機
蓄積された睡眠負債と回復プランを計算。
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Why CalaiFitness
Every calculation runs entirely in your browser using JavaScript. No data is ever sent to our servers, logged, or sold. What you enter stays on your device — always.
0 bytes
sent to servers
We use only peer-reviewed formulas: Mifflin-St Jeor for BMR/TDEE, the US Navy method for body fat, WHO BMI standards, and the Karvonen formula for heart rate zones.
10+
validated formulas
Your results are saved automatically to your browser's local storage. Open the dashboard to see your history and track how your numbers change week over week.
100%
on-device storage
Simple by Design
Pick from 18 free calculators covering every key fitness metric — from BMI to body fat to daily calories.
Input your measurements in metric or imperial units. Our clean, distraction-free interface takes seconds to fill out.
Results appear immediately, with context, categories, and advice. Save to history to track your progress over time.
Quick Answers
TDEE (Total Daily Energy Expenditure) is the total calories your body burns each day, including activity. It's the most important number in nutrition — knowing it lets you set an exact calorie target for fat loss, maintenance, or muscle gain.
Learn more →BMI is accurate as a population-level screening tool for adults. It has known limitations for athletes and older adults due to muscle mass differences. For a complete picture, pair it with body fat percentage.
Learn more →Completely private. All calculations run in your browser — nothing is ever sent to our servers. We have no database of user data. Your history is stored in your browser's localStorage only.
Learn more →Science-Based Articles
What is a healthy BMI for a 45-year-old woman who exercises? Discover why standard BMI charts mislead active women, ideal body fat ranges, and how to assess true health.
Read article →How many calories does a 5'6 woman need to maintain weight? Complete calorie chart by age, weight, and activity level with exact macro formulas.
Read article →Need 150 to 160 grams of protein daily? Here is how to hit your protein target easily with whole foods, budget-friendly staples, and exact meal breakdowns.
Read article →No sign-up. Results in under 30 seconds. Your calculator entries stay on your device.
