How do I convert joules to BTU?

To convert joules to BTU, multiply by 0.000947817. For example, 1000 joules equals approximately 0.948 BTU.

How do I convert kWh to joules?

To convert kilowatt-hours to joules, multiply by 3,600,000. For example, 1 kWh equals 3,600,000 joules.

How many joules are in one BTU?

There are approximately 1,055.06 joules in one BTU.

How do I convert calories to joules?

To convert calories (IST) to joules, multiply by 4.1868. For example, 100 calories equals approximately 418.68 joules.

Energy Converter | Joules, BTU, kWh & Calories

Common Energy Conversions

The most frequently searched energy conversions: joules to BTU (1 J ≈ 0.0009478 BTU), BTU to joules (1 BTU ≈ 1055.06 J), kWh to joules (1 kWh = 3,600,000 J), calories to joules (1 cal ≈ 4.1868 J), foot-pounds to joules (1 ft-lbf ≈ 1.35582 J), and kilocalories to joules (1 kcal ≈ 4186.8 J).

Metric vs. Imperial Energy Units

The metric system primarily uses joules (J) and kilowatt-hours (kWh) for energy. The imperial/US system commonly uses BTU (British Thermal Units) and foot-pounds (ft-lbf). One BTU is approximately 1055 joules — widely used in heating, cooling, and power industries.

About This Converter

Part of MetricToImperial.com, providing free accurate unit conversions since 2007. Also try the ImperialToMetric.com interactive converter for 100+ unit categories in one place.