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Home » Math & Conversions » Unit Conversions » Joules to BTU (J to BTU) Converter Joules to BTU (J to BTU) Converter A dual-purpose scientific converter for **Energy (J, kJ, BTU)** and **Power (W, kW, BTU/hr)**. Enter a value in any field to convert instantly. Energy Conversion (J ↔ kJ ↔ BTU) Use this to convert total energy (e.g., thermal energy, battery capacity). Joules (J) Kilojoules (kJ) BTU (British Thermal Units) Power Conversion (W ↔ kW ↔ BTU/hr) Use this for appliance ratings (e.g., heaters, AC units). Note: **1 Watt = 1 Joule per second (J/s)**. Watts (W) Kilowatts (kW) BTU per Hour (BTU/hr) The Key Difference: Energy vs. Power The most common error in this conversion is confusing **Energy** (measured in Joules or BTU) with **Power** (measured in Watts or BTU/hr). Energy (Joule, BTU): This is a *total amount* of energy. Think of it like the amount of heat stored in a hot object. Power (Watt, BTU/hr): This is the *rate* at which energy is used or transferred. A 100-Watt light bulb uses 100 Joules of energy *every second*. This page provides both calculators. If you are converting a static energy value, use the first calculator. If you are converting an appliance rating (like a heater or AC unit), use the second calculator. Conversion Formulas Energy: 1 BTU = 1055.056 Joules (J) Power: 1 BTU/hr = 0.293071 Watts (W) To convert from Joules to BTU, you **divide by 1055.056** (or multiply by 0.0009478). To convert from Watts (J/s) to BTU/hr, you **multiply by 3.41214**. Common Conversion Chart Energy (Joule) Energy (BTU) Power (Watt) Power (BTU/hr) 1 J 0.000948 BTU 1 W 3.412 BTU/hr 1,000 J (1 kJ) 0.9478 BTU 1,000 W (1 kW) 3,412 BTU/hr 1,055 J 1 BTU 293 W 1,000 BTU/hr 10,000 J (10 kJ) 9.478 BTU 10,000 W (10 kW) 34,121 BTU/hr 1,000,000 J (1 MJ) 947.8 BTU 1,000,000 W (1 MW) 3,412,141 BTU/hr Frequently Asked Questions (FAQ) What is the formula for Joules (J) to BTU? The formula is: BTU = Joules × 0.000947817 . A simpler way is to divide the number of Joules by 1055.056. How many Joules are in 1 BTU? There are **1,055.056 Joules** (or 1.055 kilojoules) in 1 British Thermal Unit (BTU). Is a Watt the same as a Joule? No. A Joule (J) is a unit of energy. A Watt (W) is a unit of power (energy over time). They are related: **1 Watt = 1 Joule per second (J/s)**. Related Calculators BTU to kWh Converter kWh to BTU Converter Watts to Amps Calculator Kelvin to Fahrenheit Converter Angstroms to Nanometers Converter Millimeters to Inches Converter Kilograms to Pounds Converter Centimeters to Inches Converter Degrees to Radians Converter Cups to Tablespoons Converter
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