Anodizing Thickness & Time Calculator
Anodic film thickness from current density and time (the 720 rule).
Anodizing GROWS the part ~half the film thickness outward (the rest consumes metal) — toleranced bores need the math. Type II: 5–25 µm; hardcoat: 50+ µm and it's a different animal.
Formula
Anodizing Thickness & Time Calculator is a free anodizing time for design engineers, metallurgists and QA inspectors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Anodizing Thickness & Time Calculator
Anodic film thickness from current density and time (the 720 rule). The calculation implements 720 rule: mils = (A/ft² × minutes)/720 (MIL-A-8625; the anodizers' 720 rule). Anodizing GROWS the part ~half the film thickness outward (the rest consumes metal) — toleranced bores need the math. Type II: 5–25 µm; hardcoat: 50+ µm and it's a different animal.
How to use Anodizing Thickness & Time Calculator
- 1Enter Current density in A/dm² (Type II decorative 1.0–1.6 · hardcoat 2.5–4).
- 2Enter Anodizing time in min.
- 3Read Film thickness instantly — no submit button needed.
Why use Anodizing Thickness & Time Calculator?
- ✓Implements the standard formula — 720 rule: mils = (A/ft² × minutes)/720
- ✓Reference cited on-page: MIL-A-8625; the anodizers' 720 rule
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Anodizing Thickness & Time Calculator use?+
It computes 720 rule: mils = (A/ft² × minutes)/720, per MIL-A-8625; the anodizers' 720 rule. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
Anodizing GROWS the part ~half the film thickness outward (the rest consumes metal) — toleranced bores need the math. Type II: 5–25 µm; hardcoat: 50+ µm and it's a different animal.
Where do the material property defaults come from?+
Defaults are standard handbook values (ASM, manufacturer datasheets, the cited standard). Always substitute certified values from your material's test certificate for critical work.
Is the Anodizing Thickness & Time Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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