How does a chess clock work?

Each player has their own clock that only runs on their turn. After making a move you tap your side to stop your clock and start your opponent. If your clock hits zero, you have run out of time and lose on the clock.

What does 5|3 or 15|10 mean?

The first number is the base time in minutes per player; the second is the Fischer increment in seconds added to your clock each time you complete a move. So 5|3 is five minutes with three seconds added per move.

Can I use it for other board games?

Yes. Although it is built for chess, the two-player clock works for any turn-based game where you want to limit each player thinking time, such as Go or Scrabble.

Is anything sent online?

No. The clock runs entirely in your browser using a high-resolution timer, and no game data leaves your device.

What is the Chess Clock?

Free online chess clock. Tap your side to pass the move; the opponent clock starts at once. Presets for bullet, blitz and rapid with Fischer increment, move counts and flag detection. Runs entirely in your browser. It runs free in your browser on Gera Tools, with nothing uploaded.

Chess Clock — Gera Tools

Name: Chess Clock
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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The Chess Clock is a two-player game timer with presets for bullet, blitz and rapid play, plus Fischer increment support. Tap your side after each move to pass the turn — the opponent clock starts the instant yours stops.

How a chess clock works

Each player has a separate clock that only ticks down on their own turn. When you finish a move, you tap your side: your clock pauses and your opponent clock begins immediately. If a clock ever reaches zero, that player has flagged and lost on time. The tool highlights the active side, counts each player moves, and shows tenths of a second once a clock drops under a minute.

Understanding the presets

Time controls are written as base time and increment, for example 5|3:

Base time — minutes each player starts with (the first number).
Increment — seconds added to your clock every completed move (the second number), known as a Fischer increment.

Presets range from fast 1|0 bullet up to relaxed 15|10 rapid. The increment keeps games from ending purely on time scrambles by giving a few seconds back each move.

Beyond chess

Although it is built for chess, the same two-player clock suits any turn-based game where you want to cap thinking time, such as Go, draughts or Scrabble. Tap to pass the turn, watch the flag, and use Reset to start again on the same control.