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Concrete Strength Calculator
Estimate the strength of curing concrete from its 28 day design strength and age.
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Estimated strength
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Estimate the strength of curing concrete from its 28 day design strength and age.
Concrete Strength Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Strength = design x (t / (4 + 0.85t)) / (28 / 27.8).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Concrete Quick Guide
Typical values for reference.
| Design MPa | Age days | Strength | |
|---|---|---|---|
| 30 | 7 | 21.0 MPa | |
| 30 | 3 | 13.6 MPa | |
| 30 | 14 | 26.2 MPa | |
| 40 | 28 | 40.0 MPa | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Concrete Strength Calculator FAQ
Answers to common questions about this calculator.
About 65 percent in 7 days and full design strength at 28 days.
Slowly, if kept moist.
Temperature, curing and water-cement ratio.
It is a rule-of-thumb estimate only.