Maker math, no fluff

A lightweight, fast set of calculators for people who build: 3D printing, electronics, Arduino and conversions. Everything runs offline in your browser.

Browse calculators How it works

Instant

Real-time results as you type. No waiting on a server.

Works offline

Math runs in your browser. No sign-up, no data collection.

Built for makers

Short, clear explanations of why each formula works. No walls of text.

All calculators

3D Printing

Cost, filament and print planning.

3D printing cost

Add material, energy and markup to get the real cost of a part.

Filament weight ↔ length

Find out how many meters of filament equal a part's weight.

Electronics

Circuits, resistors and Arduino math.

Ohm's law

Enter voltage and current to find resistance and power.

LED resistor

Find the right resistor to drive an LED without frying it.

Conversions

Units and measurements used at the bench.

Length converter

Convert between mm, cm, m, inches and feet.

Temperature converter

Convert between Celsius, Fahrenheit and Kelvin.

Why Calc Maker?

Makers waste time on loose spreadsheets and scattered formulas. Here you get the everyday math in one place, fast and explained.