What does the watts-to-calories calculator do?

It converts your cycling power output into energy. Enter your average power in watts and duration, and it returns the mechanical work done in kilojoules along with the calories you burned, helping you match training effort to nutrition.

How do watts convert to calories burned?

Average watts times duration in seconds gives work in joules, divided by 1,000 for kilojoules. Conveniently, kilojoules of work roughly equal the calories burned, because human cycling efficiency of about 20–25% nearly cancels the kJ-to-kcal conversion factor.

Why do kilojoules roughly equal calories on a bike?

Cyclists are only about 20–25% efficient, so for every kilojoule of mechanical work you actually expend about four to five kilojoules of energy. Since one calorie is about 4.18 kilojoules, the two numbers end up nearly equal, making kJ a handy calorie estimate.

瓦特換算卡路里計算機

把騎乘功率換算成功與卡路里

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平均功率 (watts)

騎乘的平均功率，例如 200

時長（分鐘）

騎乘時長（分鐘），例如 60

瓦特換算卡路里計算機

功率計顯示 watts 與千焦，但多數人習慣用卡路里思考。輸入你的平均功率與騎乘時長，本計算機會依約24%的典型騎乘效率，回傳以千焦計的機械功與你消耗的卡路里。可以用它把騎乘與營養攝取對照、比較不同強度，或理解為何在自行車上功的千焦與消耗的卡路里大致相等。

機械功是功率 × 時間：watts × 秒得到焦耳，這裡以千焦顯示。騎乘者消耗的能量比這部分功更多，因為肌肉效率只有約24%，其餘變成熱量。把功除以0.24再換算成千卡，正是「消耗卡路里 ≈ 功的千焦」這個實用經驗法則成立的原因。它只計算運動消耗的能量，不含靜息代謝，並假設典型的騎乘效率。

常見問題

What does the watts-to-calories calculator do?: It converts your cycling power output into energy. Enter your average power in watts and duration, and it returns the mechanical work done in kilojoules along with the calories you burned, helping you match training effort to nutrition.
How do watts convert to calories burned?: Average watts times duration in seconds gives work in joules, divided by 1,000 for kilojoules. Conveniently, kilojoules of work roughly equal the calories burned, because human cycling efficiency of about 20–25% nearly cancels the kJ-to-kcal conversion factor.
Why do kilojoules roughly equal calories on a bike?: Cyclists are only about 20–25% efficient, so for every kilojoule of mechanical work you actually expend about four to five kilojoules of energy. Since one calorie is about 4.18 kilojoules, the two numbers end up nearly equal, making kJ a handy calorie estimate.