Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 therm | 1.0548e+12 erg | |
| 0.01 therm | 1.0548e+13 erg | |
| 0.1 therm | 1.0548e+14 erg | |
| 1 therm | 1.055e+15 erg | |
| 5 therm | 5.274e+15 erg | |
| 10 therm | 1.055e+16 erg | |
| 50 therm | 5.274e+16 erg | |
| 100 therm | 1.055e+17 erg | |
| 1000 therm | 1.055e+18 erg |
Formula: Erg = Therm × 1.0548e15
Multiply any therm value by 1.0548e15 to get erg.
Reverse: Therm = Erg × 9.4804e-16
Common therm values — factor: 1 therm = 1.0548e15 erg
| Therm (therm) | Erg (erg) | Context |
|---|---|---|
| 0.001 therm | 1.055e+12 erg | 0.1 kWh |
| 0.01 therm | 1.055e+13 erg | 1 kWh |
| 0.1 therm | 1.055e+14 erg | 3 kWh |
| 1 therm | 1.055e+15 erg | 29.3 kWh |
| 10 therm | 1.055e+16 erg | Monthly gas fraction |
| 50 therm | 5.274e+16 erg | Half winter month |
| 100 therm | 1.055e+17 erg | Monthly winter gas |
| 500 therm | 5.274e+17 erg | Seasonal heating |
| 1,000 therm | 1.055e+18 erg | Annual home gas |
| 1e+04 therm | 1.055e+19 erg | Commercial building |
| 1e+05 therm | 1.055e+20 erg | Large industrial |
| 1e+06 therm | 1.055e+21 erg | Utility scale |
| 1.000e+09 therm | 1.055e+24 erg | Regional supply |
| 1.000e+12 therm | 1.055e+27 erg | National supply |
| 1.000e+15 therm | 1.055e+30 erg | Global scale |
1 therm = 1.0548e15 erg. Memorize for instant estimates.
Use 1.0548e15 as a quick mental multiplier.
Multiply result by 9.4804e-16 to recover the original therm value.
Bills residential and commercial customers in therms per billing cycle.
Calculates annual gas consumption for boilers and furnaces in therms.
Trades natural gas contracts denominated in therms or MMBTU.
Monitors and benchmarks gas use in therms per square foot per year.
Sizes gas pipes and appliances based on BTU/hour and therm ratings.
Models household and industrial gas demand in therms per year.
The therm is a unit of natural gas energy equal to 100,000 BTU (105,480,400 joules). It is the standard billing unit for natural gas in the United States and United Kingdom. The name comes from the Greek thermos (heat).
Gas utilities bill residential and commercial customers in therms in the US and UK. A typical US household uses about 50–100 therms per month in winter. Natural gas furnaces and water heaters are rated in therms per hour.
Interesting fact: One therm of natural gas costs about $1.00–$2.00 in the US. Burning one therm releases about 5.3 kg of CO₂. The US consumes about 28 trillion therms of natural gas equivalent energy per year.
The erg is the unit of energy in the CGS (centimeter-gram-second) system, equal to exactly 10⁻⁷ joules. It was defined by the British Association for the Advancement of Science in 1882 as the work done by a force of one dyne over one centimeter.
Ergs were widely used in 19th and early 20th century physics before SI standardization. They remain in use in astrophysics (stellar luminosities in erg/s) and some older scientific literature.
Interesting fact: The Sun radiates about 3.8 × 10³³ ergs per second. A mosquito in flight exerts about 100 ergs of energy per wingbeat. One joule = 10,000,000 ergs exactly.
Converting therm to erg is common across energy, nutrition, engineering, and science. Different sectors use different energy units — joules in physics, kcal in nutrition, kWh in electricity, and BTU in HVAC — making accurate conversion essential for cross-disciplinary work and international comparisons.
Quick reference: 5 therm = 5.2740e15 erg and 10 therm = 1.0548e16 erg. Reverse: 1 erg = 9.4804e-16 therm. Exact factor: 1 therm = 1.0548e15 erg.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.