🦊Foxulator
⚡

Energy Converter

Convert between calories, joules, kilowatt-hours, BTU, and other energy units in real-time

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

📖 How to Use

  1. Enter the energy value to convert
  2. Select the unit of your input value
  3. View real-time conversion results in all units

✨ Features

  • ✓9 energy units supported
  • ✓Calorie, SI, and electrical units side by side
  • ✓Real-time automatic calculation
  • ✓Precise decimal handling
  • ✓Quick reference table included

📐 Formula

1 kcal = 4,184 J = 4.184 kJ, 1 kWh = 3,600 kJ = 860 kcal

💡 How It Works

  • •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.

❓ FAQ

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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