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Calcimator

Concrete Curing Calculator

Estimate concrete curing time to reach target strength based on cement type and ambient temperature using ACI 209 and Nurse-Saul maturity.

Inputs

Results

Curing Days (at 73°F)

8.3

Adjusted Curing Days

8.7

7-Day Strength (%)70.4%
28-Day Strength (%)100.7%
56-Day Strength (%)108.5%
Temperature Factor0.949
Hot Weather Risk (1=Yes)0
Cold Weather Risk (1=Yes)0
How to Use This Calculator
  1. Select your cement type: 1 for Type I (normal), 2 for Type III (high early strength), or 3 for Type II (moderate heat).
  2. Enter the average ambient temperature in °F during the curing period.
  3. Set the target strength as a percentage of the 28-day design strength (e.g., 75% for typical stripping).
  4. Read the Curing Days at 73°F to see the baseline time, then use Adjusted Curing Days for your actual temperature.
  5. Check the Hot/Cold Weather Risk flags — above 90°F or below 40°F requires special curing measures.
  6. Use the strength development chart to confirm what percentage of design strength is achieved at 7, 28, and 56 days.

How the result changes with Target Strength (% of 28-day)

Target Strength (% of 28-day)Curing Days (at 73°F)Adjusted Curing Days
331.81.9
513.63.8
7488.4
9317.818.8

What each input means

Ambient Temperature (°F)
Average ambient temperature during curing period
Cement Type (1=Type I, 2=Type III, 3=Type II)
Type I: normal, Type III: high early strength, Type II: moderate heat
Target Strength (% of 28-day)
Desired strength as percentage of 28-day design strength

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Ambient Temperature (°F) = 70, Cement Type (1=Type I, 2=Type III, 3=Type II) = 1, Target Strength (% of 28-day) = 75 = 3 input(s) provided
  2. Calculate Curing Days
    Curing Days
    8.3 = 8.3
  3. Calculate Adjusted Curing Days
    Adjusted Curing Days
    8.7 = 8.7
  4. Calculate 7-Day Strength
    7-Day Strength
    70.35 = 70.35
  5. Calculate 28-Day Strength
    28-Day Strength
    100.72 = 100.72

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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