Knife Tools & Calculators
Free, practical tools for every knife owner — dial in your sharpening angle, convert blade lengths, choose a whetstone grit, work out a bevel angle, compare blade steels, and see what a knife really costs per use.
Sharpening Angle Calculator
Find the right sharpening angle for your knife type — chef, paring, hunting, pocket, survival, filet, or cleaver — with the degrees per side and the total inclusive edge angle
Blade Length Converter
Convert a blade length between inches, centimetres, and millimetres in one step — handy for comparing specs, checking carry limits, and matching sheaths, rolls, and storage
Whetstone Grit Selector
Pick the right whetstone grit for the job — repairing a chip, sharpening a dull edge, refining, or polishing to a mirror finish — with the grit number and the sharpening stage
Bevel Angle Calculator
Work out a knife's edge bevel angle from its blade thickness and bevel width — degrees per side plus the total inclusive angle, so you can match your stone to the grind
Knife Steel Hardness Guide
Compare popular blade steels — 440C, S30V, 1095, D2, VG-10, AUS-8, and M390 — at a glance: typical Rockwell hardness, edge retention, and corrosion resistance
Knife Price-Per-Use Calculator
See what a knife really costs per use from its price, how long you'll own it, and how often you use it each week — the fair way to weigh a quality blade against a cheap one