Free Online Basketball Game Clock

A basketball game clock counts down the time remaining in a quarter, half, or overtime period. It's different from a shot clock, which counts down how long a team has to attempt a shot during their possession. The game clock only stops the flow of the period — the shot clock manages possessions within it.

It depends on the level. Youth leagues typically play 8-minute quarters, FIBA and international play use 10-minute quarters, and the NBA uses 12-minute quarters.

College basketball (men's and women's) doesn't use quarters — it's played in two 20-minute halves instead.

When the score is tied at the end of regulation, an overtime period starts. Use the Next Period button to advance to OT1, OT2, and so on — each overtime period typically runs shorter than a regular quarter or half (commonly 5 minutes), which you can set with the custom time option.

Yes. Tap Start Halftime to switch to a dedicated halftime countdown, separate from the game clock. Set the halftime length (10 or 15 minutes are common), and switch back to the game clock for the next period when it ends.

Yes — it plays a loud buzzer when the period or halftime clock hits zero. Turn your device volume up, and use a large display or fullscreen for visibility across a gym.

Yes. Choose the Custom option and enter any minutes and seconds you need — useful for overtime periods, shortened youth games, or non-standard formats.

Yes. The game clock is fully responsive and works on phones, tablets, and desktop browsers with a large, easy-to-read countdown display.