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Creep Life Estimate Calculator

Work out creep life estimate instantly with clear inputs, formula shown and shareable results.

About Creep Life Estimate Calculator

The Larson-Miller parameter collapses temperature and time into one number: P = T(K) x (C + log t), with C usually near 20 for steels. Rearranged, rupture life is 10^(P/T - C). Because temperature sits in the denominator, a 20 K rise can cut creep life by more than half.

Formula

Larson-Miller

P = T x (C + log10 t), so t = 10^(P / T - C)

T
Absolute temperature, K
C
Material constant, about 20 for steels
t
Rupture time in hours

Worked example

With the default values below, Creep Life Estimate Calculator returns Estimated rupture life of 324,903. Change any input above and every figure here is recalculated in your browser.

Inputs used

Metal temperatureminimum 20 °C
550 °C
Larson-Miller parameterminimum 1 x10³
21 x10³
Larson-Miller constant Cminimum 5
20

Results

Estimated rupture life
324,903 h
Rupture life in years
37.09 years
Absolute temperature
823.2 K
Log of rupture life
5.512

Step by step

  1. 1Values used
  2. 2Larson-Miller
  3. 3Estimated rupture life= 324,903 h
  4. 4Rupture life in years= 37.09 years
  5. 5Absolute temperature= 823.2 K
  6. 6Log of rupture life= 5.512

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Preliminary estimate only. Creep and remaining-life assessment of pressure equipment must be performed by a qualified engineer using the applicable code and material master curves.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Preliminary estimate only. Creep and remaining-life assessment of pressure equipment must be performed by a qualified engineer using the applicable code and material master curves.

Frequently Asked Questions

How is the Creep Life Estimate figure worked out?

P = T x (C + log10 t), so t = 10^(P / T - C). The Larson-Miller parameter collapses temperature and time into one number: P = T(K) x (C + log t), with C usually near 20 for steels.

Where does the parameter value come from?

From the material's master curve of Larson-Miller parameter against stress, produced from short-term rupture tests at elevated temperature and published in the alloy data sheet.

What values do I need to enter?

This calculator takes 3 inputs: Metal temperature, Larson-Miller parameter, Larson-Miller constant C. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.

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