Free calculators for makers
Recipe, material and pricing calculators for candle, soap, resin, yarn, sewing and 3D printing makers. Everything runs in your browser; nothing is uploaded.
Candle making
- Candle Fragrance Load Calculator – Fragrance Oil per Wax Weight – Work out how much fragrance oil to add to your candle wax. Enter wax weight and fragrance load percentage to get the exact oil amount in grams or ounces.
- Candle Wax Calculator – How Much Wax for Your Container – Find out how much wax and fragrance oil you need to fill any candle jar or tin. Uses the water-weight method with wax-specific density factors.
Soap & bath
- Soap Lye Calculator – NaOH and Water for Cold Process Soap – Calculate sodium hydroxide (lye) and water for cold process soap from your oil recipe. Includes 14 common oils and butters, superfat and lye concentration.
Resin
- Resin Mold Volume Calculator – How Much Epoxy Resin to Mix – Calculate how much epoxy or UV resin to mix for rectangular, round or irregular molds. Get volume in ml and fl oz plus weight in grams, with extra for waste.
Knitting & crochet
- Knitting Gauge Converter – Adjust Stitch and Row Counts to Your Gauge – Your gauge doesn't match the pattern? Convert the pattern's stitch and row counts to your gauge, and see how much bigger or smaller the piece will be if you knit it as written.
- Yarn Yardage Calculator – How Much Yarn for Your Project – Estimate how much yarn a knitting or crochet project needs from a weighed swatch. Get total yards or metres, grams and the number of skeins to buy.
Sewing & quilting
- Fabric Yardage Calculator – How Much Fabric to Buy – Calculate how much fabric you need for any number of rectangular pieces. Accounts for fabric width, grainline and shrinkage, and rounds up to what the shop will cut.
3D printing
- 3D Print Cost Calculator – Filament, Electricity and Machine Wear – Work out what a 3D print really costs: filament, electricity, printer wear and failed prints. A free FDM print cost calculator that runs in your browser.
- Resin 3D Print Cost Calculator – Cost per Print for SLA, MSLA and DLP – Calculate the cost of a resin 3D print: resin used, waste, IPA and consumables, electricity and failed prints. A free MSLA, SLA and DLP print cost calculator.
Pricing & selling
- Handmade Pricing Calculator – Wholesale and Retail Prices for Crafts – Price your handmade products with the classic materials + labour + overhead formula. Get wholesale and retail prices, marketplace fees and your profit per item.