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Energy Converter - Online Joule Calorie BTU & kWh Tool

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Energy Converter

Convert Joules, Calories, BTU, kWh, and more — instantly

Please enter a valid non‑negative number.

Frequently Asked Questions

The joule (J) is the SI unit of energy. It is defined as the energy transferred when a force of one newton acts over one meter. It’s the foundation for all other energy conversions in this tool.

1 thermochemical calorie equals exactly 4.184 joules. To convert, multiply the calorie value by 4.184. Our converter uses this standard ratio instantly.

BTU stands for British Thermal Unit. It’s defined as the amount of heat required to raise one pound of water by 1°F. 1 BTU (IT) = 1,055.06 joules. It’s commonly used in heating and air conditioning.

1 kWh = 3,600,000 joules (3.6 × 10⁶ J). Conversely, 1 joule ≈ 2.7778 × 10⁻⁷ kWh. This unit is widely used on electricity bills.

A calorie (cal) is the small unit; a kilocalorie (kcal) equals 1,000 calories. In nutrition, “Calories” (with a capital C) often refer to kilocalories. Our tool clearly distinguishes them.

The electronvolt (eV) is a very small unit of energy used in atomic and particle physics. 1 eV ≈ 1.6022 × 10⁻Âčâč J. It’s convenient for describing photon energies or particle masses.

1 foot-pound force (ft·lbf) ≈ 1.3558 joules. This unit is often used in engineering and firearms. Simply select it from the dropdown to see conversions.
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