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The compressive strength in megapascals.
In a European grade like C25/30, the first number is the cylinder strength and the second the cube strength. Use the cylinder figure when comparing against US practice.
Compressive strength
4,351 psi
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
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Concrete MPa to PSI Calculator: 4,351 psi — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- 1 MPa = 1,000,000 Pa = 145.0377 psi
Inputs used
- Compressive strength (MPa)
- 30
Intermediate steps
- Conversion factor applied
- 145.04 psi per MPa
Confidence note: 1 MPa = 145.038 psi. Higher strength is not automatically better — more cement means more hydration heat and more shrinkage.
What this calculation does not cover
- The arithmetic is exact; the specifications are not interchangeable. C25/30 is not simply a psi figure — the two systems test different specimens at different ages.
- A European class such as C25/30 names both the cylinder and the cube strength. Converting only one of them and comparing it against a North American cylinder specification can be about 20% out.
- Specified strength is not target mean strength, which carries a margin for the plant's variability and is a separate calculation.
Add the equipment this sizes
This result is a specification — 4,351 psi — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-08-26 · in the site-wide review of 2026-09-06 · v1.0.0
Regulatory standards & verification citations1
- 1 MPa = 1,000,000 Pa = 145.0377 psi
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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.
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.