A zettajoule (ZJ) is a metric-prefixed unit of energy equal to 1021 joules, using the SI zetta prefix.
Zettajoules to Therms
Convert Zettajoule (ZJ) to US therm (therm) 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 zettajoules (ZJ) to therms (therm) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
The US therm is a natural-gas billing unit equal to 100,000 BTU, used by utilities to measure gas usage.
therm = ZJ × 9480434279733
Results update instantly for Zettajoules to Therms conversions.
Reserved above the conversion cards and below the converter.
Formula
therm = ZJ × 9480434279733
ZJ = therm × 1.054804000e-13
Conversion table
| 1 ZJ | 9.480434e+12 therm |
| 5 ZJ | 4.740217e+13 therm |
| 10 ZJ | 9.480434e+13 therm |
| 20 ZJ | 1.896087e+14 therm |
| 50 ZJ | 4.740217e+14 therm |
| 100 ZJ | 9.480434e+14 therm |
| 500 ZJ | 4.740217e+15 therm |
| 1000 ZJ | 9.480434e+15 therm |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both zettajoule and us therm measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in zettajoules by 9480434279733 to get therms. To reverse the conversion, multiply a us therm value by 1.054804000e-13 to get back to zettajoules.
Frequently asked questions
What is Zettajoule (ZJ)?
A zettajoule (ZJ) is a metric-prefixed unit of energy equal to 1021 joules, using the SI zetta prefix.
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.
How do I convert zettajoules to therms?
Multiply the zettajoule value by 9480434279733 to get the equivalent in therms. For example, 5 ZJ × 9480434279733 = 4.740217e+13 therm.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 9480434279733 is an exact, non-rounded value.
Can I convert therms back to zettajoules?
Yes. Divide the us therm value by 9480434279733, or multiply it by 1.054804000e-13, to get zettajoules.
Reserved between the FAQ and the article so the page stays balanced.
About converting zettajoules to therms
A zettajoule (ZJ) is a metric-prefixed unit of energy equal to 1021 joules, using the SI zetta prefix. The US therm is a natural-gas billing unit equal to 100,000 BTU, used by utilities to measure gas usage.
Use this calculator to move between zettajoules and therms accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.