What is the difference between cal and kcal?
A kilocalorie (kcal) equals 1,000 small calories (cal). Food labels typically use Calories with a capital C, which are kilocalories.
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1 Joules (J) =
2.7778e-7
Kilowatt-hours (kWh)
Equivalent in Joules
1 J
Target Unit Context
Standard unit for home electricity billing.
Energy Analysis
Interpret the converted amount and where this unit is typically used
Conversion Summary
1 J equals 2.7778e-7 kWh, which is the same as 1 joules.
Source and Target Meaning
Joules are typically used when the si base unit of energy. Kilowatt-hours are useful when standard unit for home electricity billing.
Real-World Comparison
This amount of energy is approximately:
Phone battery charge0x
Cup of coffee cooling by 10°C1.0000e-4x
100 W bulb for 1 hour0x
How to Use
Step-by-step instructions
- 1Enter the amount of energy you want to convert.
- 2Choose the source unit such as joules, calories, or kilowatt-hours.
- 3Choose the target unit to see the equivalent value instantly.
- 4Use the analysis and charts tabs to compare the same energy across other units and real-world benchmarks.
Energy Conversion Formula
Each unit is first converted into joules, then translated into the target unit using the same energy quantity.
Converted Value = Input × (From Unit in J) / (To Unit in J)Variables:
JJoules, the SI base unit of energyFrom Unit in JJoule equivalent of the source unitTo Unit in JJoule equivalent of the target unitExample
Convert 1 kWh to BTU
Inputs:
Value:1
From:Kilowatt-hours (kWh)
To:British Thermal Units (BTU)
Steps:
- 1.1 kWh = 3,600,000 J
- 2.1 BTU = 1,055.06 J
- 3.3,600,000 / 1,055.06 = 3,412.14 BTU
Result:
1 kWh = 3,412.14 BTU
Frequently Asked Questions
Why do electricity bills use kWh instead of joules?
Kilowatt-hours are more practical for household energy use because joules are very small for utility-scale consumption.
When is BTU used?
BTU is common in heating, ventilation, and air-conditioning systems, especially in the US.