Free calculators and lookups built for real sharpening decisions: the angle to hold, the file to buy, the stone sequence to follow.
Sharpening Angle Calculator
Get the right angle for any blade and the exact spine height to hold it, with the coin stack trick.
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Chainsaw File Size Finder
Match chain pitch or chain number to the correct round file, filing angle, and depth gauge setting.
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Sharpener Selector Quiz
Four questions that end with the sharpener type that fits how you actually maintain your blades.
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Whetstone Grit Converter
JIS, CAMI, and FEPA numbers disagree wildly. Convert between them by actual particle size.
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Knife Steel Lookup
Hardness, edge retention, and the abrasive that will actually cut your steel, for 30+ common steels.
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Grit Progression Builder
From chipped to mirror: the stone sequence for your edge, your steel, and your target finish.
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