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Concrete PSI to MPa Calculator

Convert concrete compressive strength from PSI to megapascals for metric specifications.

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

27.58 MPa

High confidence

1 psi = 6,894.757 Pa, so 1,000 psi = 6.895 MPa. Cube and cylinder strengths differ by roughly 20% for the same concrete — the unit conversion does not reconcile the test method.

Conversion factor applied
0.01 MPa per psi

Concrete specified in one market and supplied in another has to cross this boundary, and it is the one conversion here where getting the units right is not enough. American practice tests cylinders; much of Europe tests cubes; and the same concrete yields a higher number from a cube, typically by about a fifth. European grades such as C25/30 quote both figures precisely because they are not interchangeable, and comparing a cube strength against a US cylinder specification overstates the concrete by a margin that matters structurally. Convert the units, then confirm the specimen type before treating two strength figures as equivalent.

Add the equipment this sizes

This result is a specification — 27.579 MPa — 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 psi = 6,894.757293 Pa exactly, so 1 MPa = 145.038 psi
  • Concrete compressive strength is conventionally the 28-day value; US testing uses cylinders, much of Europe uses cubes

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Frequently asked questions

Are cylinder and cube strengths interchangeable?
No. US practice tests cylinders, much of Europe tests cubes, and a cube gives a higher number for the same concrete — commonly around 20% higher. Converting the units does not reconcile the test method, so check which specimen a specification refers to.
Why 28 days?
Because it is the conventional age at which specified strength is verified. Concrete continues gaining strength well beyond it, but 28 days became the standard reference point for compliance testing and mix design.
What is C25/30 in PSI?
European designations give both cylinder and cube strengths — C25/30 means 25 MPa cylinder and 30 MPa cube, so about 3,625 psi cylinder. Read the first number when comparing against a US cylinder specification.