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エネルギー変換機
カロリー（cal）、ジュール（J）、キロワット時（kWh）、BTUなどエネルギー単位をリアルタイムで正確に変換します。
Conversion Results
Calorie Units
Calorie
1,000
cal
Kilocalorie
1
kcal
SI Units (Joule)
Joule
4,184
J
Kilojoule
4.184
kJ
Electrical Units
Watt-hour
1.1622
Wh
Kilowatt-hour
0.00116222
kWh
Other Units
BTU
3.9657
BTU
Electronvolt
2.611447e+22
eV
Foot-pound
3,085.96
ft·lb
Quick Reference
1 kcal = 4,184 J
1 kWh = 860 kcal
1 kWh = 3,600 kJ
1 BTU = 1,055 J
1 cal = 4.184 J
1 kJ = 0.239 kcal
📖 使い方
- Enter the energy value to convert
- Select the unit of your input value
- View real-time conversion results in all units
✨ 主な機能
- ✓9 energy units supported
- ✓Calorie, SI, and electrical units side by side
- ✓Real-time automatic calculation
- ✓Precise decimal handling
- ✓Quick reference table included
📐 計算式
1 kcal = 4,184 J = 4.184 kJ, 1 kWh = 3,600 kJ = 860 kcal💡 計算原理
- •The Joule (J) is the SI standard unit of energy. 1 J = 1 N·m = 1 W·s.
- •A calorie (cal) is the energy needed to raise 1g of water by 1°C. 1 cal = 4.184 J.
- •A kilocalorie (kcal) is commonly used for food energy. 1 kcal = 1,000 cal = 4,184 J.
- •A kilowatt-hour (kWh) is used for electricity billing. 1 kWh = 3,600 kJ = 860 kcal.
- •BTU (British Thermal Unit) is used in the US and UK for heating/cooling capacity. 1 BTU ≈ 1,055 J.
- •The electronvolt (eV) is a very small energy unit used in atomic and particle physics.
- •The foot-pound (ft·lb) is used in the US for torque and energy.
❓ よくある質問
Q. What's the difference between a calorie and a food Calorie?
A. A food 'Calorie' (often written with capital C) is actually a kilocalorie (kcal). So 100 Calories on a food label equals 100,000 calories (cal).
Q. How much energy is 1 kWh?
A. 1 kWh = 3,600 kJ = about 860 kcal. It can power a 60W light bulb for about 17 hours or run a rice cooker 1-2 times.
Q. What does BTU mean for air conditioners?
A. BTU for AC indicates cooling capacity. 12,000 BTU/h = 1 ton = about 3.5 kW. Choose the right BTU rating for your room size.
Q. What's the relationship between Joules and Watts?
A. Watts (W) measure power (energy per second, J/s). Using 1W for 1 hour consumes 3,600 J = 1 Wh of energy.
Q. How small is an electronvolt?
A. 1 eV = 1.6 × 10⁻¹⁹ J, extremely small. A visible light photon carries about 1.8-3.1 eV of energy.
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