Power and Energy
cal/stoBTU/s
Convert calories per second (cal/s) to British thermal units per second (BTU/s).
Factor1 cal/s = 0.003965667 BTU/s
Converter
cal/s
Accepts numbers or expressions, e.g. 150 + 14.7
Result
BTU/s
Rendered to 6 significant figures.
Formula
Formula
BTU/s = cal/s × 0.003965667
Multiply any value in calories per second by 0.003965667 to obtain the value in British thermal units per second.
Worked example
Convert 1000 cal/s to BTU/s.
- 01Start with 1000 cal/s.
- 02Multiply by the conversion factor: 1000 × 0.003965667 = 3.96567 BTU/s.
Result1000 cal/s = 3.96567 BTU/s
Conversion table
| cal/s | BTU/s |
|---|---|
| 1 | 0.0039657 |
| 2 | 0.0079313 |
| 5 | 0.019828 |
| 10 | 0.039657 |
| 20 | 0.079313 |
| 50 | 0.19828 |
| 100 | 0.39657 |
| 200 | 0.79313 |
| 500 | 1.9828 |
| 1000 | 3.9657 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from cal/s to BTU/s?
1 cal/s equals 0.003965667 BTU/s. To convert, multiply the value in calories per second by 0.003965667.
How do I convert 1 cal/s to BTU/s?
1 cal/s = 0.00396567 BTU/s. For any value, multiply by 0.003965667.
How do I convert BTU/s back to cal/s?
Divide by the same factor — or equivalently, multiply by 252.1644. So 1 BTU/s = 252.164 cal/s.
When would I need to convert calorie per second to British thermal unit per second?
Power conversions are common when comparing motor ratings (often kW or hp), thermal duty (BTU/hr or kW), and utility consumption in mixed-unit projects.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).