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Calcimator

Concrete Strength Calculator

Estimate concrete compressive strength using Abrams' law and ACI 209 maturity model with temperature correction.

Inputs

Results

28-Day Strength (psi)

7,262 psi

Temp-Corrected Strength

6,942 psi

Strength Ratio95.59%
7-Day Strength (psi)5,109 psi
28-Day Strength (psi)7,262 psi
56-Day Strength (psi)7,881 psi
Strength at Curing Day7,314 psi
Cement Adequate (1=Yes)1
How to Use This Calculator
  1. Enter the cement content in kg/m³ — typical structural mixes use 300–450 kg/m³.
  2. Set the water/cement ratio (0.25–0.80); lower values produce stronger concrete.
  3. Enter the number of curing days since placement and the average curing temperature in °F.
  4. Read the 28-Day Strength (psi) as the baseline prediction from Abrams' law.
  5. Compare Temp-Corrected Strength to the baseline to see how temperature has helped or hurt strength gain.
  6. Use the strength development chart to verify 7-day and 56-day milestone strengths against project requirements.

How the result changes with Water/Cement Ratio

Water/Cement Ratio28-Day Strength (psi)Temp-Corrected Strength
0.318,973 psi8,578 psi
0.447,337 psi7,014 psi
0.615,767 psi5,513 psi
0.754,723 psi4,515 psi

What each input means

Cement Content (kg/m³)
Cement content per cubic meter of concrete (typical: 300-450 kg/m³)
Water/Cement Ratio
w/c ratio (lower = stronger; 0.40-0.50 typical for structural)
Curing Days
Number of days since concrete was placed
Avg Curing Temperature (°F)
Average ambient curing temperature (ideal: 60-80°F)

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Cement Content (kg/m³) = 350, Water/Cement Ratio = 0.45, Curing Days = 28, Avg Curing Temperature (°F) = 70 = 4 input(s) provided
  2. Calculate 28-Day Strength
    7262 = 7262
  3. Calculate Temp-Corrected Strength
    Temp-Corrected Strength
    6942 = 6942
  4. Calculate Strength Ratio
    Strength Ratio
    95.59 = 95.59
  5. Calculate 7-Day Strength
    7-Day Strength
    5109 = 5109

Engine last updated . Checked against 1 independently-derived test — how we verify calculators.

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