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Makers & workshop · 3 tools
Free maker & workshop tools
Calculators for the workshop bench. Plan plywood and lumber cuts with less waste, estimate what a 3D print will cost before you slice it, and decode resistor color bands or work out an LED resistor without digging through datasheets.
Every tool shows its working — formulas, assumptions and units — so you can check the numbers before you cut, print or solder. Measurements are always worth a second look against your own materials and machines.
Cut list optimizer
CutListKit · 51 pages · 6 guides
Free cut list optimizer for plywood, MDF and lumber. Enter your parts, set saw kerf and grain direction, and get printable cutting diagrams with waste %.
Open cut list optimizer →Guides
3D print cost calculator
STLCalc · 35 pages · 7 guides
Free 3D printing cost calculator with an in-browser STL viewer. Get volume, grams, filament length, print time, electricity and a full price quote. No upload.
Open 3d print cost calculator →Resistor color code calculator
ResistorColor · 92 pages · 7 guides
Free resistor color code calculator for 4, 5 and 6-band resistors. Pick colors to get the value, or type a value like 4k7 to see the bands, SMD code and E-series.
Open resistor color code calculator →Guides
- Reading Resistor Color Bands Without Guesswork
- How to Remember the Resistor Color Code
- Choosing the Right Series Resistor for an LED
- Pull-Up vs Pull-Down Resistors for Microcontrollers
- How Many Watts Does Your Resistor Need?
- How to Decode the Numbers on SMD Resistors
- Why Resistors Come in 4.7 kΩ and Not 5 kΩ