Convert Millijoules to Therms
Convert Millijoules (mJ) to Therms (thm) instantly and accurately.
Conversion Formula
thm = mJ × 9.478171203e-12
About Millijoules
A millijoule (mJ) is 10⁻³ J - the scale of surgical lasers, spark ignition, and the kinetic energy of small everyday objects. Nd:YAG lasers for ophthalmology and tattoo removal deliver 10-200 mJ per pulse. The minimum spark energy to ignite methane-air is ~0.29 mJ; an automotive spark plug discharges 30-60 mJ per cycle. A 2 g mosquito flying at 1 m/s has kinetic energy ½ × 0.002 × 1² = 1 mJ. Electrocautery monopolar pulses deliver 50-500 mJ to coagulate blood vessels. 1 mJ = 10⁻³ J = 0.2390 cal.
About Therms
A therm is the US natural gas billing unit equal to exactly 100,000 BTU = 105,505,585.262 J ≈ 105.5 MJ. One CCF of average US pipeline gas contains ~1.02 therms. The EIA publishes residential gas prices in $/therm; spot prices at Henry Hub are in $/MMBTU (1 MMBTU = 10 therms). US households average 500-700 therms/year for space heating, water heating, and cooking. A 15 kW domestic boiler running 2 hours delivers ~1 therm of useful heat. 1 therm = 100,000 BTU = 105.506 MJ = 29.307 kWh = 25,200 kcal.
Quick Reference Table
| Millijoules (mJ) | Therms (thm) |
|---|---|
| 1 mJ | 9.478 × 10-12 thm |
| 2 mJ | 1.896 × 10-11 thm |
| 5 mJ | 4.739 × 10-11 thm |
| 10 mJ | 9.478 × 10-11 thm |
| 25 mJ | 2.37 × 10-10 thm |
| 50 mJ | 4.739 × 10-10 thm |
| 100 mJ | 9.478 × 10-10 thm |