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水分摂取量計算機

毎日体が必要とする正確な水の量を把握しましょう。体重、活動レベル、居住環境に合わせてパーソナライズ。

体重

活動レベル

気候

2.6 L

/日

11 杯 (250ml)

内訳

基本量（体重 × 0.033） 2.31 L

活動量の調整 +0.3 L

気候の調整 +0 L

計算式: 基本量 = 体重(kg) × 0.033 L — 活動量と気候で調整

1日の水分摂取量は、適切な水分補給を維持するために体が必要とする総液体量を指します。

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このカルキュレーターの使い方

体重をキログラムで入力します。

活動レベルを選択します。

気候を選択します — 暑い・湿った環境では水分需要が大幅に増加します。

1日の水分目標がリットルとコップ数（各250ml）で即座に更新されます。

1日の水分必要量の計算方法

The base formula is simple: weight in kg × 0.033 liters. This gives a baseline for a sedentary person in a temperate climate. Physical activity and heat increase sweat losses, which must be replaced on top of the baseline.

Water needs are highly individual. Body size, fitness level, sweat rate, altitude, and individual metabolism all affect how much you actually need. This calculator gives a practical daily target — not a clinical prescription.

Activity Adjustments

Physical activity increases water needs through sweat. Adjustments used in this calculator:

Sedentary (desk job, little movement): +0 L — base formula only.

Moderate (light exercise 1–3 times per week): +0.3 L per day.

Active (moderate exercise 4–5 times per week): +0.6 L per day.

Very Active (intense exercise every day): +1.0 L per day. Athletes training twice daily or in extreme conditions may need even more.

Climate Adjustments

Hot or humid environments increase sweat rate significantly, even at rest. Living or working in a warm climate adds approximately +0.5 L per day to your baseline needs. This adjustment is conservative — during extreme heat or prolonged outdoor activity in summer, additional intake is often needed.

Signs of Dehydration vs Overhydration

Mild dehydration (1–2% body weight loss in fluid) causes fatigue, reduced concentration, and headaches. Dark yellow urine is a reliable early indicator. More severe dehydration affects physical and cognitive performance significantly.

Overhydration (hyponatremia) is rare but possible in endurance athletes who drink excessive amounts of plain water without sodium. For most people, following calculated targets and monitoring urine color is sufficient.

パーソナルトレーナーのための水分摂取量計算機

Proper hydration is one of the most overlooked factors in client performance and recovery. As a personal trainer, checking in on hydration habits is a simple but high-value part of your coaching. Even mild dehydration (1–2%) measurably reduces strength, power output, and cognitive function during workouts.

With Gymkee, you can add hydration tracking reminders and nutrition guidelines to your client programs — keeping all your coaching in one place, accessible on mobile.

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