The US therm is a natural-gas billing unit equal to 100,000 BTU, used by utilities to measure gas usage.
Therms to Ronnajoules
Convert US therm (therm) to Ronnajoule (RJ) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Energy calculator
Energy Converter
Convert therms (therm) to ronnajoules (RJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A ronnajoule (RJ) is a metric-prefixed unit of energy equal to 1027 joules, using the SI ronna prefix.
RJ = therm × 1.054804000e-19
Results update instantly for Therms to Ronnajoules conversions.
Reserved above the conversion cards and below the converter.
Formula
RJ = therm × 1.054804000e-19
therm = RJ × 9.480434280e+18
Conversion table
| 1 therm | 1.054804e-19 RJ |
| 5 therm | 5.274020e-19 RJ |
| 10 therm | 1.054804e-18 RJ |
| 20 therm | 2.109608e-18 RJ |
| 50 therm | 5.274020e-18 RJ |
| 100 therm | 1.054804e-17 RJ |
| 500 therm | 5.274020e-17 RJ |
| 1000 therm | 1.054804e-16 RJ |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both us therm and ronnajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in therms by 1.054804000e-19 to get ronnajoules. To reverse the conversion, multiply a ronnajoule value by 9.480434280e+18 to get back to therms.
Frequently asked questions
What is US therm (therm)?
The US therm is a natural-gas billing unit equal to 100,000 BTU, used by utilities to measure gas usage.
What is Ronnajoule (RJ)?
A ronnajoule (RJ) is a metric-prefixed unit of energy equal to 1027 joules, using the SI ronna prefix.
How do I convert therms to ronnajoules?
Multiply the us therm value by 1.054804000e-19 to get the equivalent in ronnajoules. For example, 5 therm × 1.054804000e-19 = 5.274020e-19 RJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.054804000e-19 is an exact, non-rounded value.
Can I convert ronnajoules back to therms?
Yes. Divide the ronnajoule value by 1.054804000e-19, or multiply it by 9.480434280e+18, to get therms.
Reserved between the FAQ and the article so the page stays balanced.
About converting therms to ronnajoules
The US therm is a natural-gas billing unit equal to 100,000 BTU, used by utilities to measure gas usage. A ronnajoule (RJ) is a metric-prefixed unit of energy equal to 1027 joules, using the SI ronna prefix.
Use this calculator to move between therms and ronnajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.