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3D Printing Math.
Solved.

Fast, accurate calculators for every 3D printing question. Electricity cost, filament cost, print time, profit — with presets for 20+ popular printers.

Try the Electricity Calculator See all tools

The calculators

Every tool is free, runs in your browser, and works without signing up.

Electricity Cost Calculator

Calculate the exact electricity cost of any 3D print. Pick your printer, enter print time, get the cost.

20 printer presets

Filament Cost Calculator

Know exactly what a print costs in filament. Supports spool-price math, waste factors, and multi-color prints.

32 filament presets

Print Time Estimator

Estimate how long a print will take without opening a slicer. Great for quick quotes and planning.

Flow rate profiles

Full Print Cost Calculator

The flagship: filament + electricity + labor + machine depreciation + markup. For sellers and print farms.

Etsy + eBay fees included

Why SpoolMath?

Everything free

No paywalls. No "PRO" upsell. No credit card. Other sites charge $9/month for printer presets — ours ship for free, day one.

Instant answers

Pure client-side math. Results update as you type. No page reloads, no loading spinners, no waiting on someone's overloaded API.

Numbers we can defend

Every printer wattage cites its source. Every formula is documented. You can check our math and tell us when we're wrong.

Latest articles

Honest writing on 3D printing cost, speed, and quality.

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Guide

Best 3D Printer for Beginners in 2026: 4 Picks That Actually Work

The honest, no-fluff guide to the best beginner 3D printers in 2026 — ranked by what actually matters: out-of-box quality, ease of use, and total cost of ownership.

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Filament

Best 3D Printer Filament Dryer in 2026: 5 Picks From Budget to Print Farm

Filament dryers worth buying in 2026 — the budget Sunlu S2, the 4-spool S4, the premium Polymaker, and two Sunlu alternatives. With real prices, real use cases, and what to skip.

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