About CraftCalc
CraftCalc does the arithmetic of making: how much wax those jars need, how much backing fabric, how many cast-on stitches, how much resin for that mold.
Every maker knows the moment: you're halfway through planning a project and the math arrives. Dividing jar volume by wax density, converting quilt inches into yards of 42-inch fabric, translating a gauge swatch into a cast-on number. It's the same handful of calculations, done badly under excitement, since forever.
CraftCalc encodes the standard reference math — the charts guilds and manufacturers publish — into one-minute calculators that show their formulas. Buy the right amount once, keep the leftovers for the next project.
We make things too, and we are not your material's manufacturer. Where brands differ (wax blends, resin ratios), our pages say so and defer to the datasheet.
What makes CraftCalc different
- Your numbers never leave your browser. Every calculator on CraftCalc runs entirely on your device. We never see, store, or transmit the figures you enter — there are no accounts and no server-side processing of your inputs.
- Published methodology. Each calculator page explains the exact formula it uses and the assumptions behind it, so you can check our work or reproduce it in a spreadsheet.
- Free, forever, without a paywall. CraftCalc is supported by advertising. There is no premium tier, no email gate, and no upsell.
Independence
CraftCalc is an independent educational project. We are not affiliated with, endorsed by, or acting on behalf of any government agency, lender, insurer, or the organizations whose formulas and public data we reference (such as published craft-industry reference charts). All trademarks and referenced standards belong to their respective owners.
Questions, corrections, or suggestions are genuinely welcome — get in touch.