Authoritative definitions of the International System of Units and SI prefixes.
Unit conversion
Thermochemical calories to BTU (International Table) Converter
1 cal ≈ 0.00396566683139 BTU. Enter a value to convert cal to BTU, then use the formula and table below. Displayed digits may be rounded.
Convert BTU (International Table) to Thermochemical calories
Energy, work, heat & powerInstant result
Decimals
Formula result = input × 4.184 ÷ 1055.05585262. 1 cal ≈ 0.004 BTU
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
Joules4.184 J
Kilojoules0.0042 kJ
Megajoules4.18400e-6 MJ
Watt-hours0.0012 Wh
Kilowatt-hours1.16222e-6 kWh
Kilocalories0.001 kcal
BTU (International Table)0.004 BTU
Conversion table
| cal | BTU |
|---|---|
| 1 cal | 0.004 BTU |
| 2 cal | 0.0079 BTU |
| 5 cal | 0.0198 BTU |
| 10 cal | 0.0397 BTU |
| 25 cal | 0.0991 BTU |
| 50 cal | 0.1983 BTU |
| 100 cal | 0.3966 BTU |
Conversion chart
1 cal0.004 BTU
5 cal0.0198 BTU
10 cal0.0397 BTU
25 cal0.0991 BTU
50 cal0.1983 BTU
Worked example
1 cal ≈ 0.00396566683139 BTU. Apply the selected conversion formula to other input values.
Unit definition
Thermochemical calories (cal) One thermochemical calories equals 4.184 joule.
Unit history
Thermochemical calories 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 cal to joule.
3. Convert the base value to BTU and apply your display precision.
Understand the result before using it
Thermochemical calories to BTU (International Table) converts a value measured in Thermochemical calories (cal) into the equivalent value in BTU (International Table) (BTU). 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 × 4.184 ÷ 1055.05585262
Assumptions
- Thermochemical calories and BTU (International Table) represent the same energy, work & heat quantity.
- The input is expressed in cal; the output is expressed in BTU.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 cal ≈ 0.00396566683139 BTU. 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 cal measurement in a document that expects BTU.
- Compare a thermochemical calories value with a value reported in btu (international table).
- Check the cal to BTU arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse cal 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 Thermochemical calories to BTU (International Table)?
result = input × 4.184 ÷ 1055.05585262. Input is in cal; result is in BTU. 1 cal ≈ 0.00396566683139 BTU. The displayed digits may be rounded.
What is 1 cal in BTU?
1 cal ≈ 0.00396566683139 BTU. The displayed digits may be rounded.
Can I reverse the cal to BTU conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts BTU back to cal.
Is the Thermochemical calories to BTU (International Table) 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.