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Concrete MPa to PSI Calculator

Convert a metric concrete strength grade into PSI for US mix specifications and testing.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Compressive strength

4351.13 psi

High confidence

1 MPa = 145.038 psi. Higher strength is not automatically better — more cement means more hydration heat and more shrinkage.

Conversion factor applied
145.04 psi per MPa

A metric grade being priced or tested against American practice needs this direction, and the first decision is which number to take. European designations carry a pair — C25/30 gives cylinder then cube — and only the cylinder figure compares like for like with a US specification. Beyond the arithmetic, it is worth resisting the instinct that a bigger number is better. Raising the specified strength raises the cement content, and with it the heat of hydration and the drying shrinkage, so a slab specified far above its structural requirement can crack in ways a leaner mix would not. Strength sits alongside exposure class, durability and workability rather than above them.

Add the equipment this sizes

This result is a specification — 4,351.132 psi — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • 1 MPa = 1,000,000 Pa = 145.0377 psi

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Which number in C25/30 do I convert?
The first, 25, if you are comparing against a US specification, because that is the cylinder strength and US testing uses cylinders. The second is the cube strength for the same mix and will overstate the equivalent by roughly twenty percent.
Is 30 MPa a strong mix?
It is a common structural grade, equivalent to about 4,350 psi. Residential slabs frequently sit below it and structural elements above. Strength is only one property — durability, exposure class and workability are specified alongside it.
Does higher strength mean better concrete?
Not automatically. Higher-strength mixes have more cement, which means more heat of hydration and more shrinkage. Specifying well above what the structure needs can create cracking problems it would otherwise not have.