PSI to MPa Calculator

Convert pounds per square inch to megapascals instantly with engineering stress analysis.

Conversion Mode

Choose your input unit and analysis depth.

Advanced Stress Analysis

Pressure Context

Understanding pressure values in real-world applications is critical for engineering safety. Our calculator provides the necessary context for construction (concrete), automotive (tires), and industrial (tanks) standards.

0.1013 MPa

Standard Atmospheric Pressure

20.7 MPa

Standard Concrete (3000 PSI)

Unit References

1 MPa145.038 PSI

1 Bar14.5038 PSI

1 kg/cm²14.2233 PSI

How to Convert PSI to MPa

Converting pressure from Pounds per Square Inch (PSI) to Megapascals (MPa) is a common requirement in civil engineering, materials science, and industrial applications. Because PSI is an imperial unit of pressure and MPa is a metric (SI) unit, a standardized conversion factor is used.

To convert PSI to MPa, multiply the PSI value by 0.00689475729.

To convert MPa to PSI, multiply the MPa value by 145.0377377.

Verify calculations using standard physical benchmarks (e.g. 1 MPa ≈ 145.038 PSI).

Apply appropriate engineering safety margins for real-world load-bearing applications.

PSI to MPa Example

Let's convert a standard concrete compressive strength rating of 3,000 PSI to Megapascals (MPa):

Input Pressure3,000 PSI

Conversion Rate0.00689475729

Calculation3,000 × 0.00689475729

Converted Output20.6843 MPa

Standard commercial concrete mixtures are frequently specified as 3,000 PSI or 4,000 PSI. This example shows that 3,000 PSI is equivalent to approximately 20.6843 MPa (often rounded to 20.68 MPa).

PSI to MPa Formula

The physical formulas are derived from the relationship between force in pounds and area in square inches compared to Newtons and square meters.

PSI to Megapascals (MPa)

MPa = PSI × 0.00689475729Click to copy formula

Megapascals (MPa) to PSI

PSI = MPa × 145.0377377Click to copy formula

PSI

Pounds per Square Inch

A unit of pressure representing one pound of force exerted on a surface area of one square inch.

MPa

Megapascal

A metric unit representing one million pascals, equivalent to 10 bars or 1 Newton per square millimeter (1 N/mm²).

NIST Reference

National Institute of Standards

Based on NIST pressure conversion factors, 1 PSI equals approximately 6,894.757 Pa, or 0.00689475729 MPa.

N/mm² Equality

Structural Equivalence

1 MPa is structurally identical to 1 N/mm². Civil engineers frequently swap these units in stress calculations.

PSI to MPa Conversion Table

Quickly cross-reference standard pressure values. This reference table displays standard engineering thresholds for structural, automotive, and industrial safety factors.

Conversion Benchmark

1,000 PSI = 6.8948 MPa

A simple mental rule of thumb is that 1,000 PSI is approximately 6.8948 Megapascals.

Common Conversion Table

Common benchmark pressure values under metric and imperial systems.

Pressure in PSI	Pressure in MPa
50 PSI	0.3447 MPa
100 PSI	0.6895 MPa
1,000 PSI	6.8948 MPa
2,500 PSI	17.2369 MPa
3,000 PSI	20.6843 MPa
5,000 PSI	34.4738 MPa
10,000 PSI	68.9476 MPa

Imperial System

What Is PSI?

PSI stands for pounds per square inch. It measures pressure or stress as pounds-force applied over one square inch. PSI is commonly used in the United States for tire pressure, hydraulic systems, pumps, compressors, and pressure ratings.

Common PSI Applications

Car Tires (32-35 PSI)Bicycle Tires (80-120 PSI)Residential Water (40-60 PSI)Hydraulic Systems (1500+ PSI)

International System (SI)

What Is MPa?

MPa stands for megapascal, derived from the official BIPM SI Brochure. One MPa equals one million pascals, or one newton per square millimeter. MPa is commonly used in engineering, concrete compressive strength, material stress, hydraulic pressure, and metric pressure specifications.

Common MPa Applications

Concrete Strength (20-40 MPa)Structural Steel (250+ MPa)Industrial Boilers (2-10 MPa)Geotectonic Rock Stress

Common PSI to MPa Conversions

100 PSI to MPa

100 PSI is equal to exactly 0.6895 MPa. This represents a typical pressure threshold for medium-duty air compressors and domestic water supply systems, showing that standard plumbing works below 1 MPa.

1000 PSI to MPa

1000 PSI is equal to exactly 6.8948 MPa. In industrial scenarios, this is a standard benchmark rating for high-pressure pressure washers, gas cylinders, and pneumatic pistons.

3000 PSI to MPa

3000 PSI is equal to exactly 20.6843 MPa. This is a critical engineering value representing standard-grade structural concrete strength utilized in residential driveways, footings, and slabs.

5000 PSI to MPa

5000 PSI is equal to exactly 34.4738 MPa. Pressure levels this high are common in heavy industrial hydraulic machinery, high-performance structural concrete, and deep-sea engineering gear.

10000 PSI to MPa

10000 PSI is equal to exactly 68.9476 MPa. This extreme pressure rating is typical in high-pressure oil and gas applications, hydraulic rescue tools (e.g. jaws of life), and ultra-high-pressure testing equipment.

Engineering Applications of PSI to MPa Conversion

Converting between PSI and MPa is necessary across global supply chains. Materials certified under U.S. standards (Imperial) are often converted for metric installation.

Did You Know?

"Concrete specifications are standardly designated in PSI in the US (ACI codes) and MPa in Europe, UK, and Asia (Eurocode, ISO standards)."

Essential Industries

Converting units accurately ensures international compliance with authorities like the ASME Boiler and Pressure Vessel Code and structural safety. High-precision calculations are key in:

Concrete Compressive Strength

Hydraulic & Fluid Power Systems

Automotive & Aerodynamic Pressures

Pressure Vessel Ratings

Pumps & Compressor Outputs

Material Stress & Tensile Tests

Safety Note

Always ensure compliance with OSHA air receiver requirements when operating pressurized equipment.

Frequently Asked Questions

Essential answers for converting PSI to Megapascals with high engineering accuracy.

How do you convert PSI to MPa?

To convert PSI to MPa, multiply the PSI value by 0.00689475729. For example, a 3000 PSI concrete rating multiplied by 0.00689475729 equals 20.6843 MPa.

How many MPa are in 1 PSI?

There are exactly 0.00689475729 Megapascals (MPa) in 1 Pound per Square Inch (PSI). This conversion is standardized by NIST international weight and measure standards.

How many PSI are in 1 MPa?

There are exactly 145.0377377 Pounds per Square Inch (PSI) in 1 Megapascal (MPa).

What is 3000 PSI in MPa?

3000 PSI is equivalent to exactly 20.6843 MPa. This is a common conversion benchmark representing typical concrete compressive strength.

Is MPa the same as N/mm²?

Yes. 1 Megapascal (MPa) is mathematically identical to 1 Newton per square millimeter (1 N/mm²). Both units represent force over surface area and are interchangeable in structural stress analyses.

What is the difference between standard and gauge pressure?

Gauge pressure measures pressure relative to the surrounding atmospheric pressure (standard atmosphere is ~0.101325 MPa), whereas absolute pressure includes atmospheric pressure in the final value.