Minimum Fillet Size Checker
Code minimum and maximum fillet for your plate combination.
Minimum is governed by the THICKER plate (heat sink); maximum by the THINNER edge (you can't weld past the corner). Both rules bite on the same joint surprisingly often.
Formula
Minimum Fillet Size Checker is a free minimum weld size for welding engineers, fabricators and CWI 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 Minimum Fillet Size Checker
Code minimum and maximum fillet for your plate combination. The calculation implements IS 800 T.21 minima by thicker part; max = t_edge − 1.5 mm (IS 800 Table 21; AWS D1.1 Table 5.7/5.8). Minimum is governed by the THICKER plate (heat sink); maximum by the THINNER edge (you can't weld past the corner). Both rules bite on the same joint surprisingly often.
How to use Minimum Fillet Size Checker
- 1Enter Thinner part in mm.
- 2Enter Thicker part in mm.
- 3Read Minimum fillet (by thicker part), Maximum along thinner edge instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Minimum Fillet Size Checker?
- ✓Implements the standard formula — IS 800 T.21 minima by thicker part; max = t_edge − 1.5 mm
- ✓Reference cited on-page: IS 800 Table 21; AWS D1.1 Table 5.7/5.8
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Minimum Fillet Size Checker use?+
It computes IS 800 T.21 minima by thicker part; max = t_edge − 1.5 mm, per IS 800 Table 21; AWS D1.1 Table 5.7/5.8. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Minimum is governed by the THICKER plate (heat sink); maximum by the THINNER edge (you can't weld past the corner). Both rules bite on the same joint surprisingly often.
Does this follow AWS/IS welding codes?+
Each tool implements the formula from the cited code or handbook (AWS D1.1, IS 800, ISO/EN). Qualified WPS values always govern over any calculator for code work.
Is the Minimum Fillet Size Checker 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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