BTU to Calories Converter

How to convert BTU to Calories

To convert BTU to Calories, multiply the value in BTU by 252.16539. For example, 5 BTU = 1,260.827 cal.

The BTU-to-Calories conversion comes up often in everyday and professional contexts alike. With 1 BTU equal to 252.16539 cal, you can use the tool above for any value, or scan the table below for the most common BTU amounts and their Calories equivalents.

Energy conversions appear in nutrition, fitness, physics, utility bills, and engineering. The same quantity of energy can be expressed in joules, calories, kilowatt-hours, or BTU depending on the context.

Understanding BTU and Calories

The joule is the SI unit, but everyday contexts use others: food labels use kilocalories (often just called 'calories'), electricity bills use kilowatt-hours, and heating and cooling systems use BTU (British Thermal Units). One food calorie is actually a kilocalorie — 1,000 of the small physics calories — which is a frequent source of confusion.

How accurate is this conversion?

Energy conversions use standard definitions: 1 calorie = 4.184 joules, 1 kilowatt-hour = 3,600,000 joules, 1 BTU = 1,055.06 joules. These are internationally agreed values, making the conversions exact.

All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.

Quick reference: common BTU to Calories values

The most frequently searched conversions are 1 BTU = 252.16539 Calories, 5 BTU = 1,260.827 Calories, 10 BTU = 2,521.654 Calories, and 100 BTU = 25,216.539 Calories. The full table further down covers every common value, and the calculator handles any number you need in between.