Hobbies & Crafts Calculators
The small, awkward sums that come up mid-project — paper, tuning, kerf widths and tank chemistry.
- Scrapbook Paper CalculatorHow many sheets a project needs, and which way round to cut them for the least waste.
- Piano Tuning Interval CalculatorFrequency for any note from any reference pitch, in equal temperament or just intonation.
- Waterjet Kerf CalculatorEntry and exit kerf, taper and the tool offset to program, for any material and thickness.
- Shrimp Tank Water CalculatorTarget GH, KH, TDS and pH for your species, and what a water change will actually do to them.
- Yarn Yardage CalculatorHow many skeins a hat, sweater or blanket takes in any yarn weight, knitted or crocheted.