How many Joules are in a kBTU?

kBTU stands for 'kilo-BTU', or 1,000 BTU. Therefore, there are 1,000 * 1055.056 = 1,055,056 Joules in 1 kBTU.

BTU to Joules (J) Converter

Q: What is the formula for BTU to Joules (J)?

The formula is: Joules = BTU × 1055.056. To convert from Joules to BTU, you divide by 1055.056 or multiply by 0.0009478.

Q: How many Joules are in 1 BTU?

There are 1,055.056 Joules (or 1.055 kilojoules) in 1 British Thermal Unit (BTU).

Q: What is the difference between BTU/hr and Joules/second (Watts)?

This is a common point of confusion. - BTU and Joules measure ENERGY (an amount). - BTU/hr and Watts (W) measure POWER (the rate of energy use). A Watt is defined as 1 Joule per second (1 W = 1 J/s). To convert power: 1 BTU/hr = 0.293071 Watts.

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).