Energy Converter
Convert energy units including joules, kilojoules, calories, kilocalories, kWh, BTU, eV, watt-hours, and foot-pounds.
✓ Runs in your browser · Updated 2026-03-31Enter values and click Convert to see results
How Energy Conversion Works
All energy units convert through the joule (J), the SI unit of energy. Each unit has a factor representing how many joules it equals. Formula: result = value × (fromFactor / toFactor).
- 1 calorie = 4.184 joules (thermochemical)
- 1 kilocalorie (food Calorie) = 4,184 joules
- 1 kWh = 3,600,000 joules
- 1 BTU ≈ 1,055.06 joules
Energy in Electricity Billing (India)
Indian electricity boards charge per kWh (unit). One "unit" of electricity = 1 kilowatt-hour = the energy consumed by a 1,000-watt appliance running for 1 hour.
| Appliance | Wattage | Daily Use (hrs) | Monthly kWh |
|---|---|---|---|
| LED Bulb | 10 W | 8 | 2.4 |
| Ceiling Fan | 75 W | 12 | 27 |
| Refrigerator | 150 W | 24 | 108 |
| AC (1.5 ton) | 1,500 W | 8 | 360 |
| Washing Machine | 500 W | 1 | 15 |
| Geyser | 2,000 W | 0.5 | 30 |
Typical domestic electricity rate in India: ₹3–₹8 per kWh (varies by state and slab).
Food Calories vs Physics Calories
The "Calorie" on food labels is actually a kilocalorie (kcal). 1 food Calorie = 1,000 physics calories = 4,184 joules. A typical Indian thali provides about 600–800 kcal, while daily requirement is about 2,000 kcal for adults.
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Frequently Asked Questions
How do I convert kilowatt-hours (kWh) to joules?
Multiply kWh by 3,600,000. For example, 1 kWh = 3.6 million joules (3.6 MJ).
What is the difference between calories and kilocalories?
1 kilocalorie (kcal), commonly called a food Calorie, equals 1,000 small calories. In nutrition, 'Calories' on food labels refer to kilocalories.
How many joules are in 1 calorie?
1 thermochemical calorie equals approximately 4.184 joules.