Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Closed ideal-gas reversible adiabatic model. It is not a vehicle compression-test prediction; leakage, valve timing and heat transfer matter.
Example Calculation
- Initial absolute pressure: 14.7 psi absolute
- Volume compression ratio: 10
- Heat-capacity ratio gamma: 1.4
Initial absolute pressure = 14.7; Volume compression ratio = 10; Heat-capacity ratio gamma = 1.4. Primary result: 369.247305431.
Frequently asked questions
How do I use this calculator?
Enter initial absolute pressure, volume compression ratio, heat-capacity ratio gamma. The result updates automatically. Use Reset to restore the example values.
What method does it use?
P2=P1 ×compression ratio^gamma.. Closed ideal-gas reversible adiabatic model. It is not a vehicle compression-test prediction; leakage, valve timing and heat transfer matter.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.