KerfCalc
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About this app
KerfCalc is a set of woodworking calculators for the weekend workshop. Clean, fast, and built for the way woodworkers actually measure: in fractions.
No ads. No accounts. No subscription. Works with no signal at all.
BUILT FOR FRACTIONS
Type 1-3/4 the way you'd say it. A custom keypad puts the fraction keys where your thumb already is, with shortcuts for the sixteenths and eighths you use constantly. Every calculation stays exact — no decimal drift, no 0.749999 where 3/4 belongs.
Switch the whole app to millimetres whenever you want, and it remembers.
FREE TOOLS
• Converter — fractions, decimals and millimetres, three ways
• Board feet — with a running tally and a cost estimate at your price per board foot
• Shelf spacing — even divider positions, marked from one end so errors can't accumulate
• Screws & pilot holes — the pilot and countersink size for every screw gauge, by wood hardness
UNLOCK EVERYTHING — ONE PAYMENT
• Cut list optimizer — for boards and for sheet goods. Counts the blade.
• Saved cut lists — name a job and come back to it
• Board inventory — what's actually in your rack, with total board feet
• Stain & finish — how much to buy, coats and waste buffer included
• Joinery reference — dovetail slopes with angles, box joints, proportion rules
• Golden ratio — harmonious proportions from a single dimension
IT COUNTS THE KERF
Four 24-inch pieces from a 96-inch board sounds like it fits. It doesn't — three cuts at 1/8" each eat 3/8", and the fourth piece comes up short. KerfCalc plans around the blade, for boards and for full sheets, and shows you the layout.
IT KNOWS A 2x4 ISN'T 2x4
Tap a nominal size and you get the real one: 1-1/2 x 3-1/2. Getting that wrong is the fastest way to build a carcass an inch off.
HONEST NUMBERS
When a value can't be marked on a tape, KerfCalc says so rather than pretending. When there are two right answers — what the lumberyard charges versus what you can actually cut — it gives you both.
Everything stays on your device. Nothing is collected, and nothing is sent anywhere.
No ads. No accounts. No subscription. Works with no signal at all.
BUILT FOR FRACTIONS
Type 1-3/4 the way you'd say it. A custom keypad puts the fraction keys where your thumb already is, with shortcuts for the sixteenths and eighths you use constantly. Every calculation stays exact — no decimal drift, no 0.749999 where 3/4 belongs.
Switch the whole app to millimetres whenever you want, and it remembers.
FREE TOOLS
• Converter — fractions, decimals and millimetres, three ways
• Board feet — with a running tally and a cost estimate at your price per board foot
• Shelf spacing — even divider positions, marked from one end so errors can't accumulate
• Screws & pilot holes — the pilot and countersink size for every screw gauge, by wood hardness
UNLOCK EVERYTHING — ONE PAYMENT
• Cut list optimizer — for boards and for sheet goods. Counts the blade.
• Saved cut lists — name a job and come back to it
• Board inventory — what's actually in your rack, with total board feet
• Stain & finish — how much to buy, coats and waste buffer included
• Joinery reference — dovetail slopes with angles, box joints, proportion rules
• Golden ratio — harmonious proportions from a single dimension
IT COUNTS THE KERF
Four 24-inch pieces from a 96-inch board sounds like it fits. It doesn't — three cuts at 1/8" each eat 3/8", and the fourth piece comes up short. KerfCalc plans around the blade, for boards and for full sheets, and shows you the layout.
IT KNOWS A 2x4 ISN'T 2x4
Tap a nominal size and you get the real one: 1-1/2 x 3-1/2. Getting that wrong is the fastest way to build a carcass an inch off.
HONEST NUMBERS
When a value can't be marked on a tape, KerfCalc says so rather than pretending. When there are two right answers — what the lumberyard charges versus what you can actually cut — it gives you both.
Everything stays on your device. Nothing is collected, and nothing is sent anywhere.
Woodworking calculators that speak fractions. Offline, no ads, one-time unlock.
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Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
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What’s new
KerfCalc 1.0 — woodworking math that speaks fractions.
Type 1-3/4 the way you'd say it. Convert fractions, decimals and millimetres. Board feet with a running tally and cost. Even shelf spacing. Screw and pilot hole sizes by wood.
Unlock once for the cut list optimizer — boards and sheet goods, counting the kerf — plus saved lists, board inventory, stain and finish, joinery and golden ratio.
No ads. No accounts. No subscription. Works with no signal.
Type 1-3/4 the way you'd say it. Convert fractions, decimals and millimetres. Board feet with a running tally and cost. Even shelf spacing. Screw and pilot hole sizes by wood.
Unlock once for the cut list optimizer — boards and sheet goods, counting the kerf — plus saved lists, board inventory, stain and finish, joinery and golden ratio.
No ads. No accounts. No subscription. Works with no signal.
Everyone
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About the developer
Deakyu Lee
ldq2888@gmail.com
299 N Dunton Ave APT 624
Arlington Heights, IL 60004-5942
United States