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Calorie international table to BTU thermochemical

Convert calorie international table (cal IT) to BTU thermochemical (BTU th) with adjustable precision, a worked example and a reference table.

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Converters workspace● Runs in your browser
01 Your input
02 Your result
YOUR RESULT
Ready when you are
Conversion formula(value × 4.1868 + 0 − 0) ÷ 1054.350264488889

Reference table

cal ITBTU th
10.00397097638329
50.0198548819164
100.0397097638329
250.0992744095822
500.198548819164
1000.397097638329

How the conversion works

The input is converted into J using the source factor and offset, then into BTU thermochemical. This keeps unit definitions consistent across the energy collection.

Definitions and sources

Factors are maintained in the versioned unit dataset. Output is rounded to your selected significant digits; calculation uses JavaScript double precision.

How to use this tool

  1. Enter a finite numeric value in calorie international table.
  2. Choose the significant digits for your result.
  3. Copy or download the result, including its formula.

Try this example

10

Accuracy and scope

Calorie and BTU conventions are explicitly distinguished. Electronvolt uses the exact post-2019 SI elementary charge.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.