About KnifeMatic

KnifeMatic is an independent, advertising-supported site about knives — sharpening, blade steel, and the everyday decisions that come with owning and caring for a blade. The core of the site is a set of free calculators, backed by a Knife Museum that traces the history of the knife itself.

How the tools are built

Each tool takes the numbers you already have — a blade thickness, a knife type, a price, a length in one unit — and runs them through a fixed, published formula or lookup table. Nothing is guessed and nothing is personalized; the same inputs always produce the same output.

The Sharpening Angle Calculatormaps a knife type — chef’s, paring, hunting, pocket, survival, or cleaver — to a conventional degrees-per-side range and reports both that figure and the total inclusive edge angle (per side × 2). The Bevel Angle Calculatorworks the geometry from the other direction: enter a blade’s thickness and bevel width and it computes the bevel angle with arcsin(thickness ÷ (2 × bevel width)), again giving per-side and inclusive figures.

The Whetstone Grit Selectoris a lookup, not a calculation: it matches a sharpening stage — repairing a chip, sharpening a dull edge, refining, or polishing — to the grit range conventionally used for that stage, from coarse repair stones up through mirror-finish polishing stones. The Knife Steel Hardness Guideis a reference table for seven steels you’ll actually see on a spec sheet — 440C, S30V, 1095, D2, VG-10, AUS-8, and M390 — showing each one’s typical Rockwell (HRC) hardness range alongside its usual edge retention and corrosion resistance, drawn from published steel data and manufacturer spec sheets rather than lab testing of our own.

The Blade Length Converteris unit conversion: inches, centimetres, and millimetres, computed directly rather than rounded from a chart, which matters when you’re checking a blade against a carry-length limit or a sheath spec. The Knife Price-Per-Use Calculatortakes a purchase price, an expected ownership period, and how often you use the knife per week, and divides price by total projected uses — a plain arithmetic way to compare a cheap knife you’ll replace against a pricier one you’ll keep sharpening for years.

What this is — and isn’t

KnifeMatic isn’t affiliated with any knife brand, steel manufacturer, or standards body it references, and it doesn’t sell knives. The site is free to use and supported by advertising. Every calculator produces an estimate built on conventional formulas and published reference figures, not a lab measurement of your specific blade — treat the results as a starting point, not a guarantee, and always handle and sharpen knives carefully, keeping the edge moving away from your hands and fingers.

Alongside the tools, the Knife Museumcovers the types, steels, and traditions behind the knife, with entries and images sourced from Wikipedia and Wikimedia Commons. Questions, corrections, or a steel we’ve missed — see Contact.