Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 therm | 25.2104 kcal | |
| 0.01 therm | 252.104 kcal | |
| 0.1 therm | 2521.04 kcal | |
| 1 therm | 25210.4 kcal | |
| 5 therm | 126052 kcal | |
| 10 therm | 252104 kcal | |
| 50 therm | 1.26052e+06 kcal | |
| 100 therm | 2.52104e+06 kcal | |
| 1000 therm | 2.52104e+07 kcal |
Formula: Kilocalorie = Therm × 25,210
Multiply any therm value by 25,210 to get kilocalorie.
Reverse: Therm = Kilocalorie × 3.9666e-5
Common therm values — factor: 1 therm = 25,210 kcal
| Therm (therm) | Kilocalorie (kcal) | Context |
|---|---|---|
| 0.001 therm | 25.21 kcal | 0.1 kWh |
| 0.01 therm | 252.1 kcal | 1 kWh |
| 0.1 therm | 2,521 kcal | 3 kWh |
| 1 therm | 2.521e+04 kcal | 29.3 kWh |
| 10 therm | 2.521e+05 kcal | Monthly gas fraction |
| 50 therm | 1.261e+06 kcal | Half winter month |
| 100 therm | 2.521e+06 kcal | Monthly winter gas |
| 500 therm | 1.261e+07 kcal | Seasonal heating |
| 1,000 therm | 2.521e+07 kcal | Annual home gas |
| 1e+04 therm | 2.521e+08 kcal | Commercial building |
| 1e+05 therm | 2.521e+09 kcal | Large industrial |
| 1e+06 therm | 2.521e+10 kcal | Utility scale |
| 1.000e+09 therm | 2.521e+13 kcal | Regional supply |
| 1.000e+12 therm | 2.521e+16 kcal | National supply |
| 1.000e+15 therm | 2.521e+19 kcal | Global scale |
1 therm = 25,210 kcal. Memorize for instant estimates.
Use 25,210 as a quick mental multiplier.
Multiply result by 3.9666e-5 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 kilocalorie (kcal) equals 1,000 calories or 4,184 joules, and is the unit used on food labels worldwide (often written as 'Cal' with a capital C in the US). It was standardized by the International Table calorie in 1956.
Nutritionists, dietitians, and food scientists use kcal for daily energy intake recommendations. Most adults need 2,000–2,500 kcal/day. Exercise apps, fitness trackers, and dietary plans all operate on kcal.
Interesting fact: One gram of fat yields about 9 kcal, one gram of carbohydrate or protein yields about 4 kcal. A single sugar cube (4g) contains about 16 kcal.
Converting therm to kilocalorie 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 = 126,100 kcal and 10 therm = 252,100 kcal. Reverse: 1 kcal = 3.9666e-5 therm. Exact factor: 1 therm = 25,210 kcal.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.