Free Chess Move Calculator — Find the Best Move with Stockfish
Paste a FEN, set up the pieces or play through a line, and this free chess move calculator instantly finds the best move in any position with the full Stockfish engine. You get the strongest move, the principal variation and an exact evaluation for both sides — no signup, no daily limit, and nothing to install.
Unlike calculators that run the engine on a slow shared server, Stockfish 18 runs locally in your browser at real analysis depth, so every calculation is fast, private and completely free — a stronger, faster alternative to nextchessmove.com and the other move calculators.
Use it to check the best move in a tricky middlegame, confirm the winning idea in an endgame, or double-check an opening line. The calculator searches deep and shows the top engine lines side by side, so you see the best move and the runner-up, not just a single answer.
What the move calculator gives you
The best move, instantly
Set up any legal position and the calculator returns Stockfish's strongest move within seconds, complete with the exact evaluation for both sides.
Full principal variation
It does not just name one move — it shows the whole best line for both sides, so you understand the plan behind the recommendation.
Paste a FEN or set up pieces
Load a position from a FEN string, drag the pieces to build one by hand, or play the moves out — the calculator evaluates whatever you set up.
Top engine lines compared
See the best move and the strongest alternatives side by side with their evaluations, so you can weigh candidate moves instead of trusting one number.
Full-strength Stockfish 18
The calculator uses Stockfish 18, one of the strongest chess engines in the world, at real analysis depth — not a weakened free version.
Free, private, no limits
The engine runs locally in WebAssembly, so nothing you calculate leaves your device. No account, no cost, and no cap on how many positions you calculate.
How to calculate the best chess move
Set up the position
Paste a FEN, drag pieces onto the board, or play the moves to reach the exact position you want to calculate.
Read the best move
The calculator highlights Stockfish's strongest move and shows the evaluation — positive favors White, negative favors Black, near zero is equal.
Follow the whole line
Step through the principal variation to see how the engine expects the game to continue for both sides, not just the first move.
Compare alternatives
Play a different candidate move to instantly recalculate and see how much it changes the evaluation versus the best move.
Frequently asked questions
Is the chess move calculator free?
Yes, completely, and there is no daily limit. Stockfish runs in your own browser, so you can calculate the best move in as many positions as you like for nothing, with no signup and no account.
How do I calculate the best move from a FEN?
Paste the FEN into the board and the calculator immediately evaluates the position, returning Stockfish's best move, the principal variation and the exact score for both sides.
Which engine does the calculator use?
It uses Stockfish 18, one of the strongest chess engines in the world, compiled to WebAssembly so it runs at real depth directly on your device with no server round-trip.
Is it stronger than nextchessmove.com or other calculators?
It runs the full Stockfish 18 engine locally at real analysis depth, so the moves are engine-strength. Because it runs on your device instead of a shared server, calculations are fast and there is no queue or daily limit.
What does the evaluation number mean?
The score is shown from White's perspective in pawns: +1.0 means White is a pawn better, -2.0 means Black is winning by two pawns, and near 0.0 is roughly equal. A '#' with a number means a forced checkmate in that many moves.
Should I use it during a live game?
No. Using an engine during a live game is cheating and breaks the rules of chess.com, lichess and FIDE. This calculator is for studying positions, analyzing finished games and learning — not for playing.