How many joules in a calorie?

1 food calorie (kcal) = 4,184 joules. 1 small calorie (cal) = 4.184 joules. The food Calorie is 1,000 times larger than the scientific calorie.

What is a kilowatt-hour?

1 kWh = 3,600,000 joules = 3.6 MJ. This is the unit electricity companies use for billing. Running a 1000W heater for 1 hour uses 1 kWh.

How many calories does a human burn per day?

Average adult burns 1,800-2,500 kcal/day = 7,500,000-10,500,000 joules/day. This is equivalent to 2-3 kWh of electrical energy.

What is BTU in energy?

1 BTU (British Thermal Unit) = 1,055.06 joules. Used to rate air conditioners and heaters in USA. A 12,000 BTU AC cools approximately 150-200 sq ft.

How do I calculate electricity consumption?

Energy (kWh) = Power (kW) × Time (hours). A 100W bulb running 10 hours = 1 kWh. At ₹8/kWh, that costs ₹8 to run for 10 hours.

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📊 Common Energy Reference

From	To	Value
1 kcal (food calorie)	Joules	4,184 J
1 kWh	Megajoules	3.6 MJ
1 BTU	Joules	1,055 J
1 kWh	kcal	860 kcal
2,000 kcal/day	kJ	8,368 kJ

Frequently Asked Questions

Q: What is the difference between cal and kcal?

A calorie (cal) is energy to heat 1g water by 1°C. A kilocalorie (kcal) = 1,000 cal. Food labels show "Calories" which are actually kilocalories. "200 Calories" on food = 200 kcal = 836,800 joules.

Q: How many kWh does a home use per day?

An average Indian household uses 3–8 kWh per day. An AC uses about 1–2 kWh/hour. A 100W bulb for 10 hours = 1 kWh. Electricity bills in India are charged per kWh (unit).

📊 Common Energy Reference

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