A kilocalorie is 1,000 calories.
Kilocalories to US therms Converter — kcal to therm
Convert Kilocalorie (kcal) to US therm (therm) using the exact conversion factor (1 kilocalorie = 0.0000396661 us therm). See the formula, worked examples, and conversion table.
Kilocalories to US therms converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
US therm used for natural gas energy.
Result = input x 4184 / 1.054804e+8.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Kilocalories to US therms
Kilocalorie and US therm both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: A kilocalorie is 1,000 calories, and uS therm used for natural gas energy.
Formula
us therms = kilocalories × 0.0000396661370264
This factor comes from each unit's defined relationship to the category's base unit: 1 kilocalorie equals 4184 base units, and 1 us therm equals 105480400 base units, so dividing one by the other gives the direct kilocalorie-to-us therm factor of 0.0000396661370264.
Simple example
1 kcal × 0.00003966613703 = 0.0000396661 therm
1 kilocalorie = 0.0000396661 us therms.
Real-world example
100 kcal × 0.00003966613703 = 0.0039666137 therm
100 kilocalories = 0.0039666137 us therms.
Conversion table
| Kilocalorie (kcal) | US therm (therm) |
|---|---|
| 1 kcal | 0.0000396661 therm |
| 10 kcal | 0.0003966614 therm |
| 50 kcal | 0.0019833069 therm |
| 100 kcal | 0.0039666137 therm |
| 500 kcal | 0.0198330685 therm |
| 1,000 kcal | 0.039666137 therm |
Reverse conversion: US therm to Kilocalorie
0.0000396661 therm × 25210.42065 = 0.9999990665 kcal
0.0000396661 us therms = 0.9999990665 kilocalories.
kilocalories = us therms × 25210.4206501
For a page dedicated to this direction, see US therm to Kilocalorie.
Understanding the Kilocalorie (kcal)
A kilocalorie is 1,000 calories.
Understanding the US therm (therm)
US therm used for natural gas energy.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many us therms are in 1 kilocalorie?
1 kilocalorie equals 0.0000396661 us therms, using the exact defined conversion factor rather than an estimate.
How do I convert kilocalorie to us therm?
Multiply the kilocalorie value by 0.00003966613703. The converter above does this instantly to whatever precision you set.
How do I convert us therm back to kilocalorie?
Use the reverse factor: 1 us therm equals 25,210.42065 kilocalories. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilocalorie?
Kilocalorie (kcal) is a unit of engineering.
What is a us therm?
US therm (therm) is a unit of engineering.
Is the kilocalorie to us therm conversion exact?
Yes. Both kilocalorie and us therm are defined by fixed standards rather than physical artifacts, so the factor of 0.00003966613703 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.