Energy Converter
Energy can be expressed in joules (SI), calories, kilowatt-hours, British thermal units (BTU), electron volts, and foot-pounds. Energy conversion is essential in physics, engineering, nutrition, and electricity billing.
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Tip: Your electricity bill charges per kWh. To estimate: (watts × hours) / 1000 = kWh. A 1000W microwave running 1 hour = 1 kWh. At $0.15/kWh, that's 15 cents.
- 11 joule = 1 watt-second (W·s)
- 21 kilowatt-hour (kWh) = 3,600,000 J = 3.6 MJ
- 31 food calorie (kcal) = 4,184 J
- 41 BTU = 1,055.06 J (heat needed to raise 1 lb water by 1°F)
| Unit | In joules | Common context |
|---|---|---|
| 1 joule (J) | 1 | SI standard; lifting ~100g by 1 meter |
| 1 kilojoule (kJ) | 1,000 | Food energy, thermodynamics |
| 1 calorie (cal) | 4.184 | Chemistry (not food calories) |
| 1 food Cal (kcal) | 4,184 | Nutrition labels |
| 1 Wh | 3,600 | Small battery capacity |
| 1 kWh | 3,600,000 | Electricity billing unit |
| 1 BTU | 1,055 | HVAC, heating |
| 1 eV | 1.6 × 10⁻¹⁹ | Atomic and nuclear physics |
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Fun Fact
The average human body uses about 2,000 kcal/day = 8.36 MJ. In watts, that's 96.8 W — roughly equivalent to a 100-watt light bulb. You are generating as much heat as a light bulb, all day, every day.
References
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