The Best Free Printable Cheat Sheets for Coding, Science and Maths

Published 25 July 2026

There is a reason a printed cheat sheet stuck to the wall beats a browser tab you have to keep re-opening: your eyes flick to it in a second, it never gets buried under other windows, and it works when you are offline or away from the screen. printsheet.io has a growing library of free printable cheat sheets for developers, students and scientists — each one drawn to exact A4 and US Letter scale, with no sign-up, no account and no watermark. Here are the best of them, grouped by what you are working on.

Developer & tech cheat sheets

These are the quick-reference sheets that save you a search mid-task. Print one, pin it by the monitor, and stop breaking your flow to look up the same command for the hundredth time.

• Git cheat sheet — the everyday commands: staging, committing, branching, merging, rebasing, stashing and undoing mistakes. The one to keep next to you while you are still building muscle memory for Git.
• Linux commands cheat sheet — files and directories, permissions, processes, networking, package management and text tools, all on a single printable page.
• HTTP status codes reference — every 1xx to 5xx code and what it actually means, so you can read an API response or a server log at a glance.
• Common ports reference — the TCP/UDP port numbers for the services you meet all the time (HTTP, HTTPS, SSH, DNS, SMTP and the rest) — handy for firewalls, networking study and troubleshooting.
• ASCII table — the full 0–127 character chart with decimal, hex and control codes, the classic reference for anyone working close to the bytes.
• Subnet calculator — enter a CIDR block and print a clean netmask report: network and broadcast address, host range, host count and binary breakdown. Perfect for networking homework and CCNA-style study.

Science cheat sheets

Exam-ready reference sheets that gather the formulas, constants and reactions you are expected to have at your fingertips — great for revision walls and open-book classes.

• Chemistry cheat sheet — moles and stoichiometry, gas laws, acids and bases, equilibrium and common ions on one dense, printable page.
• Physics cheat sheet — kinematics, forces, energy and work, waves and the key physical constants, laid out for quick recall.
• Electronics cheat sheet — Ohm's law, the resistor colour code, RC/RL time constants and the core formulas every hobbyist and student needs by the bench.
• Periodic table cheat sheet — groups, periodic trends, common ions and electron configurations, going a step beyond a plain table.

Maths cheat sheets

The formula sheets students reach for most, all drawn cleanly so nothing is cramped or hard to read when printed.

• Trigonometry cheat sheet — identities, the key formulas and the unit circle in one place, so the values you always forget are right there.
• Calculus cheat sheet — derivatives, integrals, series and limits: the reference sheet for getting through a problem set.
• Geometry cheat sheet — area and volume formulas, circles, triangles and coordinate geometry, all clearly labelled.

Why print a cheat sheet instead of bookmarking one?

A printed reference has three quiet advantages. It is always visible — pinned to the wall, it never disappears behind other windows. It is distraction-free — no notifications, no rabbit holes, just the information you needed. And it works anywhere — in an exam room, on a workbench, on a network cabinet door, or anywhere a laptop is awkward. For anything you look up repeatedly, a sheet of paper genuinely beats a browser tab.

Printed to exact scale, free to keep

Every cheat sheet here is drawn as sharp vector graphics sized for A4 and US Letter, so text stays crisp and the layout fills the page properly whether you print at home, at the library or at work. There is no sign-up, no account and no watermark — just open the sheet, print it at 100% scale, and pin it up. If you want to be sure your printer is producing pages at true size, our free ruler test confirms it in under a minute.

More on the way

The cheat sheet collection keeps growing alongside the rest of the library. Bookmark the templates hub and search “cheat sheet” to see the full current set — and check back, because new reference sheets are added regularly.

Frequently asked questions