Pressure Converter
Unit Reference
| Unit | Symbol | Equivalent to 1 atm |
|---|
- Pascal (Pa) — SI unit, 1 N/m²
- Atmosphere (atm) — Standard sea level pressure (101,325 Pa)
- Bar — Metric unit, ≈ atmospheric pressure (100,000 Pa)
- PSI — Pounds per square inch
- mmHg/Torr — Based on mercury column height
| Date | From | To | Actions |
|---|
Pressure Converter: Complete Guide
Pressure is all around us—in our car tires, the weather forecast, scuba tanks, and even our blood pressure readings. Our Pressure Converter makes it simple to convert between 11 different pressure units.
What is Pressure?
At its simplest, pressure is force divided by area. Imagine standing on one foot versus both feet—the force (your weight) is the same, but the pressure is higher when standing on one foot because the area is smaller.
The Pressure Formula
Pressure = Force ÷ Area (P = F/A)
Where: P = Pressure, F = Force (Newtons), A = Area (m²)
Try Our Pressure Converter
Convert between 11 different pressure units instantly. Just enter a value, select your units, and see the conversion happen in real-time!
How to Use the Converter
- Enter a value in the input field.
- Select "From" and "To" units from the dropdowns.
- Click Convert or press Enter to see the result.
- Use Swap to quickly reverse the conversion.
- Export results as TXT, HTML, or PDF.
The Conversion Formula
The Conversion Process
Target Value = (Input Value × Input Unit Factor) ÷ Target Unit Factor
Step 1: Convert to Pascals (Pa) using the factor for the input unit.
Step 2: Convert from Pascals to the target unit using its factor.
Supported Pressure Units
| Unit | Symbol | Factor (Pa) |
|---|---|---|
| Pascal | Pa | 1 |
| Kilopascal | kPa | 1000 |
| Megapascal | MPa | 1000000 |
| Bar | bar | 100000 |
| Millibar | mbar | 100 |
| Atmosphere | atm | 101325 |
| mmHg | mmHg | 133.322 |
| Torr | torr | 133.322 |
| PSI | psi | 6894.76 |
| inHg | inHg | 3386.39 |
| inH₂O | inH₂O | 248.84 |
Worked Example
Real-World Example: Car Tire Pressure
Problem: Convert 2.1 bar to PSI.
Solution:
- 2.1 bar × 100,000 = 210,000 Pascals
- 210,000 Pascals ÷ 6894.76 (PSI factor) = 30.46 PSI
- Result: 2.1 bar = 30.46 PSI
So if your gauge shows around 30-31 PSI, your tires are properly inflated!
Advantages of This Converter
- 11 units: Supports all common pressure units.
- Real-time: Results update instantly.
- History: Keeps track of recent conversions.
- Export: Save results as TXT, HTML, PDF.
- Accurate: Uses precise conversion factors.
Pro Tip: Standard Atmospheric Pressure
Remember: 1 atm = 101,325 Pa = 14.696 PSI = 760 mmHg. This is a useful reference for conversions.
Tips for Using the Converter
- Use the swap button to quickly reverse your conversion.
- Export your results when you need to save calculations.
- Check the unit reference table to understand all units.
- Try different values to see how pressure reads in different units.
Common Mistakes to Avoid
- Confusing atm with bar: 1 atm ≈ 1.013 bar, not exactly equal.
- Mixing mmHg and inHg: 1 inHg ≈ 25.4 mmHg.
- Using wrong factor for PSI: 1 PSI = 6894.76 Pa.
Frequently Asked Questions
1. Why are there so many different pressure units?
Different industries and countries developed their own units over time. mmHg came from barometers, PSI from the imperial system, etc.
2. What's the difference between PSI and bar?
PSI is imperial (pounds per square inch), bar is metric. 1 bar ≈ 14.5 PSI.
3. Are mmHg and torr exactly the same?
For practical purposes, yes. 1 mmHg ≈ 1 torr.
4. What pressure unit should I use for science?
Use Pascals (Pa) or kilopascals (kPa) for scientific calculations.
5. How do I convert blood pressure from mmHg to PSI?
120/80 mmHg ≈ 2.32/1.55 PSI.
6. What's "standard atmospheric pressure"?
101,325 Pa, 1 atm, 1013.25 mbar, 760 mmHg, or 14.696 PSI.
7. Why do scuba divers use bar?
Scuba tanks are measured in bar (metric) or PSI (imperial).
8. How accurate is the pressure converter?
Our calculator uses precise conversion factors with up to 6 decimal places.
9. Can I convert negative pressure?
Yes! Enter negative values for vacuum pressures.
10. What's the smallest pressure unit?
Pascal (Pa) is the base SI unit.
11. Why is atmospheric pressure 1 atm at sea level?
This was defined as the average pressure at sea level.
12. How does altitude affect pressure conversions?
Atmospheric pressure decreases with altitude. Our converter assumes sea level.
13. What's the most common pressure unit worldwide?
Pascal is the SI unit, but bar and PSI are most common in practice.
14. Can I save my conversion results?
Yes! Export as TXT, HTML, or PDF.
15. How do I know which unit to use?
Check what your equipment uses or what's standard in your industry.