mpy means mils per year, a penetration-rate unit commonly used for corrosion calculations.

Can this calculator assess pitting severity?

No. Average mass-loss corrosion rate can miss localized pitting. Treat pitting measurements separately.

Which area should I enter?

Enter the exposed surface area used in the mass-loss test. Masked or unexposed surfaces should not be included.

ToolsConductScience tool

CorrosionFree in-browser calculator

Corrosion Rate Calculator.

Calculate average mass-loss corrosion rate in mpy and mm/year for coupon and materials exposure studies. For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

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Validated2026-05-24

CitableMethods and citation included

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Try it out

Load example corrosion rate data to see the full workflow

Mass-loss inputs

Mass loss

Density

g/cm3

Exposed area

in2

Exposure time

Results

Corrosion rate

4.85896 mpy

Corrosion rate

0.123418 mm/year

Review notes

Average mass-loss corrosion rate can miss localized pitting severity.

Methods note

Uses corrosion rate mpy = 534 * W / (D * A * T), where W is mg, D is g/cm3, A is in2, and T is hours.

Scope and limitations

For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

Results are deterministic calculations from the values entered here. Review units, assumptions, and measurement quality before using outputs in reports or protocols.

Method

Uses the tool-specific formulas and assumptions shown in the calculator output.

Validated

Last validated 2026-05-24. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.

How to cite

How to Cite

Corrosion Rate Calculator (1.2.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/corrosion-rate-calculator

For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

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