Convert British Thermal Units to Microjoules
Convert British Thermal Units (BTU) to Microjoules (µJ) instantly and accurately.
Conversion Formula
µJ = BTU × 1055055853
About British Thermal Units
A British Thermal Unit (BTU) - the heat to raise 1 lb of water by 1°F - equals exactly 1,055.05585262 J. It dominates US HVAC: room air conditioners are rated in BTU/h (5,000-24,000 BTU/h = 1.5-7.0 kW); one ton of refrigeration is exactly 12,000 BTU/h. Natural gas is billed in therms (100,000 BTU) in the US. Higher heating values: natural gas ~1,020-1,050 BTU/ft³; No. 2 fuel oil ~138,700 BTU/US gal; propane ~91,500 BTU/US gal. 1 BTU = 1,055.06 J = 252.164 cal = 0.29307 Wh.
About Microjoules
A microjoule (µJ) is 10⁻⁶ J - the scale of precision laser ablation, ESD damage events, and individual LIDAR pulses. LASIK eye surgery delivers 0.5-2 µJ per pulse at 193 nm, ablating ~0.25 µm of corneal tissue per pulse. ESD events that destroy IC gates correspond to 1-1,000 µJ; the Human Body Model test discharges ~500 µJ at 2 kV. Q-switched microchip laser pulses for rangefinding are 1-100 µJ. The kinetic energy of a 1 mg grain of sand falling 10 cm is mgh ≈ 0.98 µJ. 1 µJ = 10⁻⁶ J.
Quick Reference Table
| British Thermal Units (BTU) | Microjoules (µJ) |
|---|---|
| 1 BTU | 1.055 × 109 µJ |
| 2 BTU | 2.11 × 109 µJ |
| 5 BTU | 5.275 × 109 µJ |
| 10 BTU | 1.055 × 1010 µJ |
| 25 BTU | 2.638 × 1010 µJ |
| 50 BTU | 5.275 × 1010 µJ |
| 100 BTU | 1.055 × 1011 µJ |