Chess Unblocked
Play chess online for free — no download, no installation, no restrictions. Works on any browser and any device. Full Stockfish 18 analysis included.
Free — no signup required
Play Chess Anywhere
Chess Calculator runs directly in your browser — no apps to install, no accounts to create. Whether you're on a school Chromebook, a work laptop, a phone, or a tablet, just open the site and start playing.
Under the hood, Stockfish 18 (the world's strongest chess engine) runs locally in your browser, giving you instant analysis with no lag. Perfect for learning chess, analyzing your games, or playing a quick match on your break.
Works on Every Device
Chess Calculator works smoothly on every device with a modern web browser:
Desktop & Laptop
Windows, macOS, Linux — Chrome, Firefox, Safari, Edge. Full-size board with all features.
Phones & Tablets
iPhone, iPad, Android phones and tablets. Touch-optimized board with drag-and-drop pieces.
Chromebooks
Full support on Chrome OS. Perfect for school Chromebooks where app installation is restricted.
Any Network
Works on school WiFi, work networks, and public hotspots without any special setup.
Everything Included — For Free
Chess Calculator isn't a stripped-down version of chess. You get the full experience with no compromises:
- Full chess calculator powered by Stockfish 18 (3500+ ELO) — the strongest engine available
- Play vs AI with adjustable ELO slider from 400 to 3650 — play at any difficulty level
- 2 Player mode — play against a friend on the same device
- AI Coach explains every move in plain language — learn why moves are good or bad
- FEN and PGN support — paste positions or import full games for analysis
- Smart Tactics training — 9 tactical focus modes including forks, pins, and sacrifices (Premium)
- Screenshot Scanner — scan any chess board from any site or photo instantly (Premium)
- Human Mode — natural-looking move suggestions for realistic practice, great for realistic practice (Premium)
Frequently Asked Questions
What does chess unblocked mean?
Chess unblocked means you can play chess directly in your browser without any downloads or installations. Chess Calculator runs entirely in your browser, so it works anywhere you have a web browser and internet access.
Is it really free?
Yes. The free tier includes the full chess board, Play vs AI, ELO test, 2-player mode, and 5 AI coaching insights per day. No account or signup needed.
Does it work on Chromebooks and tablets?
Yes. Chess Calculator works on Chromebooks, iPads, iPhones, Android devices, and any computer with Chrome, Safari, Firefox, or Edge.
Can I play offline?
The site needs internet to load the first time, but then plays smoothly even on slow connections. For fully offline analysis, our Desktop App runs native Stockfish on macOS and Windows with no internet required.
What features come with Premium?
Premium unlocks full 3650 ELO engine depth, unlimited AI Coach, Human Mode, Smart Tactics training, Screenshot Scanner, the Chrome Extension, and the Desktop App for macOS and Windows.