What inputs are required?

Enter mass loss in mg, density in g/cm³, exposed area in cm², and exposure time in hours.

What formula does the calculator use?

It uses CR (mm/a) = 87.6 × ΔW / (ρ × A × t), based on the ASTM G1 weight-loss calculation.

mpy means mils per year, a corrosion-rate unit calculated as mm/a × 39.37.

What is the corrosion rating based on?

The tool provides an indicative NACE-style rating band intended for carbon steel: excellent, good, fair, or poor.

Can I control the displayed precision?

Yes. Set Decimal Places from 0 to 6 to control the reported precision.

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Uniform Corrosion Rate Calculator (Weight Loss)

Uniform corrosion rate by weight loss per ASTM G1: CR (mm/a) = 87.6 × ΔW / (ρ × A × t), with ΔW in mg, ρ in g/cm³, A in cm², t in hours. Also reports mpy (mils/year = mm/a × 39.37) and an indicative NACE-style carbon-steel rating (excellent/good/fair/poor). Used for immersion tests and coupon exposure.

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2 examples

Steel coupon: ΔW=50 mg, ρ=7.85, A=20 cm², t=720 h → CR ≈ 0.0388 mm/a

30-day immersion: CR = 87.6 × 50 / (7.85 × 20 × 720) = 4380 / 113040 = 0.0388 mm/a, mpy = 0.0388 × 39.37 = 1.526. Rating: good (1–5 mpy band).

{"result":"Corrosion rate CR = 87.6 × 50 / (7.85 × 20 × 720) = 0.0388 mm/a. mpy = 0.0388 × 39.37 = 1.526. Rating: good (0.025–0.12 mm/a, 1–5 mpy) — indicative NACE band for carbon steel.","metadata":{"input":{"massLoss":50,"density":7.85,"area":20,"time":720},"result":{"corrosionRateMmPerYear":0.0388,"corrosionRateMpy":1.526,"rating":"good"}}}

Stainless 304: ΔW=2 mg, ρ=8.0, A=15 cm², t=8760 h → CR ≈ 0.000167 mm/a

One-year immersion: CR = 87.6 × 2 / (8.0 × 15 × 8760) = 175.2 / 1051200 = 0.0001667 mm/a, mpy = 0.00656. Rating: excellent (<1 mpy band) — confirms 304 is essentially resistant in this environment.

{"result":"Corrosion rate CR = 87.6 × 2 / (8.0 × 15 × 8760) = 0.000167 mm/a. mpy = 0.00656. Rating: excellent (<0.025 mm/a, <1 mpy) — indicative NACE band for carbon steel.","metadata":{"input":{"massLoss":2,"density":8,"area":15,"time":8760},"result":{"corrosionRateMmPerYear":0.000167,"corrosionRateMpy":0.00656,"rating":"excellent"}}}

Inputs

Set the required fields, then run the tool.

5 options

SettingsAdjust formats, ranges, numbers, and modes.5

Mass loss ΔW (mg)numberRequiredMass lost from the specimen in milligrams, measured by weighing before/after the test.Density ρ (g/cm³)numberRequiredMaterial density in g/cm³. E.g. carbon steel ≈ 7.85, stainless 304 ≈ 8.0, aluminum ≈ 2.70, copper ≈ 8.96.Exposed area A (cm²)numberRequiredTotal exposed specimen surface area in cm². Include all wetted faces.Exposure time t (h)numberRequiredExposure duration in hours. E.g. 24 (1 day), 720 (30 days), 8760 (1 year).Decimal PlacesnumberOptional

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Uniform Corrosion Rate Calculator (Weight Loss)

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Use cases

Examples

1. Steel coupon after a 30-day immersion test

2. Stainless 304 coupon after one year

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