CalcChef tool collection
Maker Tools
Plan hands-on projects with quick estimates that help you size materials and understand costs before starting.
Start with these tools
3D Print Cost Calculator
3D print cost from model weight, filament price per kg, print time, printer watts and electricity rate, plus an optional waste allowance, wear and labor.
Gear Ratio Calculator
Gear ratio, output RPM and speed change for one pair of gears or sprockets, from the driver and driven tooth counts and the input RPM.
Thread Yardage Estimator
Estimate sewing thread in yards and 500-yard spools for a garment, jacket, quilt, pillow, bag or hem from seams, stitch type and thread weight.
All Maker Tools
4 free browser-based tools
3D Print Cost Calculator
3D print cost from model weight, filament price per kg, print time, printer watts and electricity rate, plus an optional waste allowance, wear and labor.
Candle Burn Time & Wax Fragrance Calculator
Wax weight and fragrance oil for a candle jar from its inside diameter, fill height, wax and load, plus a rough burn time from fixed burn rates.
Gear Ratio Calculator
Gear ratio, output RPM and speed change for one pair of gears or sprockets, from the driver and driven tooth counts and the input RPM.
Thread Yardage Estimator
Estimate sewing thread in yards and 500-yard spools for a garment, jacket, quilt, pillow, bag or hem from seams, stitch type and thread weight.