Pressure Converter
Convert between PSI, bar, pascal, atmosphere, torr, mmHg, and more pressure units instantly.
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Quick Conversion Table
Comprehensive pressure references covering automotive, scientific, and industrial applications
| Unit | Pa | kPa | bar | atm | psi | mmHg | inHg |
|---|---|---|---|---|---|---|---|
| 1 Pascal | 1 | 0.001 | 0.00001 | 0.0000099 | 0.000145 | 0.0075 | 0.000295 |
| 1 kPa | 1,000 | 1 | 0.01 | 0.00987 | 0.145 | 7.5 | 0.295 |
| 1 bar | 100,000 | 100 | 1 | 0.987 | 14.5 | 750 | 29.5 |
| 1 atm | 101,325 | 101.3 | 1.013 | 1 | 14.7 | 760 | 29.9 |
| 1 psi | 6,895 | 6.895 | 0.0689 | 0.0680 | 1 | 51.7 | 2.04 |
| 1 mmHg | 133.3 | 0.133 | 0.00133 | 0.00132 | 0.0193 | 1 | 0.0394 |
| 1 inHg | 3,386 | 3.386 | 0.0339 | 0.0334 | 0.491 | 25.4 | 1 |
| Real-World Applications | |||||||
| Tire Pressure (30 psi) | 206,850 | 207 | 2.07 | 2.04 | 30 | 1,551 | 61.1 |
| Blood Pressure (120 mmHg) | 16,000 | 16.0 | 0.160 | 0.158 | 2.32 | 120 | 4.72 |
| Vacuum Pump (-29 inHg) | -98,194 | -98.2 | -0.982 | -0.969 | -14.2 | -737 | -29 |
| Deep Sea (1000m depth) | 10,133,250 | 10,133 | 101.3 | 100 | 1,470 | 76,000 | 2,992 |
| Hydraulic System (3000 psi) | 20,685,000 | 20,685 | 206.8 | 204.1 | 3,000 | 155,100 | 6,108 |
| Steam Boiler (150 psi) | 1,034,250 | 1,034 | 10.34 | 10.20 | 150 | 7,755 | 305 |
| Airplane Cabin (11 psi) | 75,843 | 75.8 | 0.758 | 0.748 | 11 | 569 | 22.4 |
💡 Tip: The highlighted rows show key reference units - Pascal (blue), bar (green), atmosphere (orange), psi (red), inHg (yellow), and hydraulic system (purple) for quick reference. Bold values show when units equal themselves. Includes real-world applications from medical to industrial scales.
Understanding Pressure Conversions
A Comprehensive Guide to Pressure and Force per Unit Area
Pressure conversion is essential in engineering, meteorology, automotive, and scientific applications. Whether you're checking tire pressure, monitoring weather systems, working with hydraulic equipment, or conducting scientific experiments, understanding how to convert between different pressure units is crucial. This guide will help you master pressure conversions across all scales.
Metric System
Convert between pascals, bars, kilopascals, and other metric units. Based on the SI system with logical relationships.
Imperial System
Work with PSI, atmospheres, inches of mercury, and other imperial units. Common in US automotive and industrial applications.
Specialized Units
Convert between torr, mmHg, and other specialized pressure units for scientific and medical applications.
Cross-System Conversion
Convert between metric and imperial systems. Essential for international engineering and scientific collaboration.
Atmospheric Pressure
Work with atmospheric pressure units for weather monitoring, aviation, and altitude calculations.
Industrial Applications
Convert between high-pressure units for hydraulics, pneumatics, and industrial equipment specifications.
Master Pressure Conversions with Real Examples
Learn step-by-step how to convert between different pressure units with practical examples from automotive, weather, and industrial applications
1. Metric System Conversions
Metric Conversion = Value × Power of 10
Example: 2 bar to kilopascals → 2 × 100 = 200 kPa
Key Relationships: 1 bar = 100 kPa, 1 kPa = 1000 Pa
Metric pressure units follow decimal relationships for easy conversion
Purpose:
Converts between metric pressure units using decimal factors.
“How many kilopascals are in 1.5 bar?”
Benefits:
Used in science, engineering, and most countries worldwide. Systematic decimal-based system with logical relationships.
Steps:
1. Identify the decimal factor (e.g., bar to kPa is ×100)
2. Multiply your value by that factor
3. Add the correct unit to your result
Example: 1.5 bar to kilopascals
Calculation: 1.5 × 100 = 150
Result: 150 kPa
Result:
1.5 bar = 150 kilopascals
Example:
“Atmospheric pressure is about 1.013 bar, which equals 101.3 kPa or 101,300 Pa.”
2. Imperial System Conversions
Imperial Conversion = Value × Conversion Factor
Example: 30 psi to atmospheres → 30 ÷ 14.696 = 2.04 atm
Key Factors: 1 atm = 14.696 psi, 1 atm = 29.92 inHg
Essential for US automotive and industrial pressure measurements
Purpose:
Converts between imperial pressure units using specific factors.
“How many atmospheres is 45 psi?”
Benefits:
Common in US automotive, HVAC, and industrial applications. Based on traditional pressure measurements.
Steps:
1. Identify the conversion factor (e.g., psi to atm is ÷14.696)
2. Apply the conversion factor
3. Add the correct unit to your result
Example: 45 psi to atmospheres
Calculation: 45 ÷ 14.696 = 3.06
Result: 3.06 atm
Result:
45 psi = 3.06 atm
Example:
“Car tire pressure of 32 psi equals about 2.18 atmospheres or 220 kPa.”
3. Metric ↔ Imperial Conversions
Cross-System = Value × Exact Conversion Factor
Example: 2 bar to psi → 2 × 14.504 = 29.01 psi
Key Factors: 1 bar = 14.504 psi, 1 psi = 6.895 kPa
These are exact definitions used internationally
Purpose:
Converts between metric and imperial pressure systems.
“How many psi is 3 bar?”
Benefits:
Essential for international engineering, automotive specifications, and working with global equipment standards.
Steps:
1. Use exact conversion factor (e.g., 1 bar = 14.504 psi)
2. Multiply your value by the factor
3. Add the correct unit to your result
Example: 3 bar to psi
Calculation: 3 × 14.504 = 43.51
Result: 43.51 psi
Result:
3 bar = 43.51 psi
Example:
“A hydraulic system rated at 200 bar operates at about 2,901 psi.”
4. Scientific & Medical Conversions
Scientific Conversion = Value × Specialized Factor
Example: 760 torr to mmHg → 760 × 1 = 760 mmHg
Key Factors: 1 torr = 1 mmHg, 760 torr = 1 atm
Essential for vacuum systems, blood pressure, and laboratory work
Purpose:
Converts between specialized pressure units for scientific and medical use.
“How many mmHg is 0.5 atm?”
Benefits:
Essential for medical equipment, vacuum systems, laboratory
Steps:
1. Identify the specialized conversion factor (e.g., atm to mmHg is ×760)
2. Apply the conversion factor
3. Verify with scientific standards
Example: 0.5 atm to mmHg
Calculation: 0.5 × 760 = 380
Result: 380 mmHg
Result:
0.5 atm = 380 mmHg
Example:
“Normal blood pressure of 120/80 mmHg equals about 0.158/0.105 atm.”
Tips & Best Practices for Pressure Conversions
Always check your units: bar ↔ kPa (×100), psi ↔ kPa (×6.895)
Remember that pressure = force per unit area, and conversions depend on exact definitions.
Use dimensional analysis: (30 psi) × (6.895 kPa/psi) = 206.85 kPa
Write out units to ensure they cancel correctly and avoid mistakes.
Essential Tips:
- • Memorize key conversion factors (14.696 psi/atm, 100 kPa/bar)
- • Remember pressure = force ÷ area
- • Always include units in your calculations
- • Round appropriately based on measurement precision
- • Double-check direction of conversion
Best Practices:
- • Practice with real pressures (tire pressure, weather)
- • Use estimation to check if answers are reasonable
- • Learn both metric and imperial for versatility
- • Understand the relationship between force, area, and pressure
- • Use conversion tools for complex calculations
Real-Life Applications:
- • Automotive tire pressure and maintenance
- • Weather monitoring and barometric pressure
- • Hydraulic and pneumatic systems
- • Medical equipment and blood pressure
- • Vacuum systems and scientific instruments
Watch Out For:
- • Confusing gauge pressure vs. absolute pressure
- • Using approximate instead of exact factors
- • Forgetting temperature effects on pressure
- • Mixing up similar units (torr vs mmHg)
- • Not considering altitude effects on atmospheric pressure