Authoritative definitions of the International System of Units and SI prefixes.
Unit conversion
BTU (International Table) to Thermochemical calories Converter
1 BTU ≈ 252.164400722 cal. Enter a value to convert BTU to cal, then use the formula and table below. Displayed digits may be rounded.
Convert Thermochemical calories to BTU (International Table)
Energy, work, heat & powerInstant result
Decimals
Formula result = input × 1055.05585262 ÷ 4.184. 1 BTU ≈ 252.1644 cal
Nonzero results too small for the selected decimal places use scientific notation.
Nonzero results too small for the selected decimal places use scientific notation.
Common examples
One value, several units
Joules1,055.0559 J
Kilojoules1.0551 kJ
Megajoules0.0011 MJ
Watt-hours0.2931 Wh
Kilowatt-hours0.0003 kWh
Thermochemical calories252.1644 cal
Kilocalories0.2522 kcal
Conversion table
| BTU | cal |
|---|---|
| 1 BTU | 252.1644 cal |
| 2 BTU | 504.3288 cal |
| 5 BTU | 1,260.822 cal |
| 10 BTU | 2,521.644 cal |
| 25 BTU | 6,304.11 cal |
| 50 BTU | 12,608.22 cal |
| 100 BTU | 25,216.4401 cal |
Conversion chart
1 BTU252.1644 cal
5 BTU1,260.822 cal
10 BTU2,521.644 cal
25 BTU6,304.11 cal
50 BTU12,608.22 cal
Worked example
1 BTU ≈ 252.164400722 cal. Apply the selected conversion formula to other input values.
Unit definition
BTU (International Table) (BTU) One btu (international table) equals 1,055.05585262 joule.
Unit history
BTU (International Table) is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert BTU to joule.
3. Convert the base value to cal and apply your display precision.
Understand the result before using it
BTU (International Table) to Thermochemical calories converts a value measured in BTU (International Table) (BTU) into the equivalent value in Thermochemical calories (cal). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 1055.05585262 ÷ 4.184
Assumptions
- BTU (International Table) and Thermochemical calories represent the same energy, work & heat quantity.
- The input is expressed in BTU; the output is expressed in cal.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 BTU ≈ 252.164400722 cal. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a BTU measurement in a document that expects cal.
- Compare a btu (international table) value with a value reported in thermochemical calories.
- Check the BTU to cal arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse BTU with another unit that has a similar name or symbol.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert BTU (International Table) to Thermochemical calories?
result = input × 1055.05585262 ÷ 4.184. Input is in BTU; result is in cal. 1 BTU ≈ 252.164400722 cal. The displayed digits may be rounded.
What is 1 BTU in cal?
1 BTU ≈ 252.164400722 cal. The displayed digits may be rounded.
Can I reverse the BTU to cal conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts cal back to BTU.
Is the BTU (International Table) to Thermochemical calories result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.