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Home » Math & Conversions » Unit Conversions » BTU to Joules (J) Converter BTU to Joules (J) Converter A dual-purpose scientific converter for **Energy (BTU, J, kJ)** and **Power (BTU/hr, W, kW)**. Enter a value in any field to convert instantly. Energy Conversion (BTU ↔ J ↔ kJ) Use this to convert total energy (e.g., thermal energy, battery capacity). BTU (British Thermal Units) Joules (J) Kilojoules (kJ) Power Conversion (BTU/hr ↔ W ↔ kW) Use this for appliance ratings (e.g., heaters, AC units). Note: **1 Watt = 1 Joule per second (J/s)**. BTU per Hour (BTU/hr) Watts (W) Kilowatts (kW) BTU vs. BTU/hr: The Critical Difference (Energy vs. Power) The most common error in this conversion is confusing **Energy** (measured in BTU or Joules) with **Power** (measured in BTU/hr or Watts). They are not the same. Energy (BTU, Joule): This is a *total amount* of energy. Think of it like the amount of heat stored in a hot object. Power (BTU/hr, Watt): This is the *rate* at which energy is used. A 100-Watt light bulb uses 100 Joules of energy *every second*. (1 W = 1 J/s). 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 The conversion factors are precise: Energy: 1 BTU = 1055.056 Joules (J) Power: 1 BTU/hr = 0.293071 Watts (W, or J/s) To convert from BTU to Joules, you **multiply by 1055.056**. To convert from BTU/hr to Watts, you **multiply by 0.293071**. Common Conversion Chart BTU (Energy) Joules (J) BTU/hr (Power) Watts (W) 1 BTU 1,055 J 1 BTU/hr 0.293 W 100 BTU 105,506 J 1,000 BTU/hr 293 W 1,000 BTU 1.055 MJ (MegaJ) 3,412 BTU/hr 1,000 W (1 kW) 10,000 BTU 10.55 MJ 10,000 BTU/hr 2,931 W (2.93 kW) Frequently Asked Questions (FAQ) What is the formula for BTU to Joules (J)? The formula is: Joules = BTU × 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). What is the difference between BTU/hr and Joules/second (Watts)? BTU/hr measures **Power** (the rate of energy use), just as a Watt (W) does. A Watt is defined as 1 Joule per second. The conversion is: 1 BTU/hr = 0.293071 Watts (J/s). Related Calculators BTU to kWh Converter kWh to BTU Converter Calories to Joules Converter PSI to Bar Converter Kelvin to Fahrenheit Converter Fahrenheit to Kelvin Converter Angstroms to Nanometers Converter Nanometers to Meters Converter Millimeters to Inches Converter Kilograms to Pounds Converter
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