Concrete Grade ↔ PSI Converter
M-grades, MPa, psi and typical-use guide in one card.
M20 ≈ '2,300 psi' in US cylinder terms — NOT 2,900. Typical uses: M15 PCC beds · M20 houses · M25–30 commercial frames · M40+ precast/prestressed.
Formula
Concrete Grade ↔ PSI Converter is a free m20 in psi for civil engineers, contractors and quantity surveyors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Concrete Grade ↔ PSI Converter
M-grades, MPa, psi and typical-use guide in one card. The calculation implements psi = MPa × 145; US-equivalent = ×0.8 first (IS 456 grades; ACI 318 strength classes). M20 ≈ '2,300 psi' in US cylinder terms — NOT 2,900. Typical uses: M15 PCC beds · M20 houses · M25–30 commercial frames · M40+ precast/prestressed.
How to use Concrete Grade ↔ PSI Converter
- 1Enter Grade (M-number / MPa cube) in MPa.
- 2Read Cube strength, US-style cylinder psi instantly — no submit button needed.
Why use Concrete Grade ↔ PSI Converter?
- ✓Implements the standard formula — psi = MPa × 145; US-equivalent = ×0.8 first
- ✓Reference cited on-page: IS 456 grades; ACI 318 strength classes
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Concrete Grade ↔ PSI Converter use?+
It computes psi = MPa × 145; US-equivalent = ×0.8 first, per IS 456 grades; ACI 318 strength classes. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
M20 ≈ '2,300 psi' in US cylinder terms — NOT 2,900. Typical uses: M15 PCC beds · M20 houses · M25–30 commercial frames · M40+ precast/prestressed.
Does it include wastage?+
Yes — standard wastage/bulking factors are built in and stated in the formula line, so the quantity is an orderable number, not a bare geometric volume.
Is the Concrete Grade ↔ PSI Converter free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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