Work out corrosion rate instantly with clear inputs, formula shown and shareable results.
The weight loss coupon method converts mass lost into a uniform thickness loss rate: mils per year = 534 W / (D A T), with W in milligrams, density in g/cm³, area in square inches and time in hours. The 534 constant carries all the unit conversions. A rate below 5 mpy is generally considered good service.
Corrosion rate
mpy = 534 x W / (D x A x T)
mpy = 534 x W / (D x A x T). The weight loss coupon method converts mass lost into a uniform thickness loss rate: mils per year = 534 W / (D A T), with W in milligrams, density in g/cm³, area in square inches and time in hours.
No. It assumes uniform attack. Localised pitting or crevice corrosion can perforate a wall while the average rate looks negligible, so coupons must also be examined visually.
This calculator takes 4 inputs: Mass loss, Material density, Exposed area, Exposure time. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.