The free online 900 second timer on FinalTimer.com counts down 15 minutes without an app and without an account. Set it, start it and get back to what matters.
Why Use a 900 Second Timer?
Here is where 15 minutes fit perfectly:
- Speeches & Pitches: Rehearse lightning talks, elevator pitches or class presentations with a visible 900-second limit.
- Classroom Activities: Teachers use a 900 second timer for reading time, group tasks or quiz rounds so everyone can see how much time is left.
- Screen-Time Limits: Agree on 15 minutes of gaming or social media and let the alarm end the session instead of a discussion.
- Cooking Rice: White rice usually simmers for 15 to 20 minutes, then rests briefly. A 900 second timer keeps the pot under control.
- Mindful Breathing: A 15 minutes breathing exercise or body scan is long enough to calm your mind and short enough to fit into any day.
Fun Fact About 900 Seconds
Each quarter of an NFL game lasts 15 minutes of game time. Your 900 second timer runs for the same amount of time.
900 is a perfect square: 30 × 30.
How to Set a 900 Second Timer
- Check the preset time (15:00) and click Start Timer; the countdown begins immediately.
- Optionally add a label, enable the alarm and choose one of 13 alarm sounds (use the speaker button to preview them).
- Need intervals? Use Repeat Timer or add more timers. They will run one after another automatically.
- Use fullscreen mode for a large, distraction-free display and Export Settings to save your setup as a JSON file.
Recommended Timers for Specific Activities
Related timers with ready-made programs:
- Pull consistent espresso shots with the Barista Workflow Timer.
- For precision cooking, the Pasta Cooking Timer makes sure your pasta is perfectly al dente.
- Brew better coffee with the Coffee Brewing Timer.
- Find the perfect steeping time with the Tea Brewing Timer.
Other Timers You Might Like
Frequently Asked Questions About the 900 Second Timer
How long is a 900 second timer?
A 900 second timer runs for exactly 15 minutes. That equals .
Can I pause or repeat the 900 second timer?
Yes. While the countdown is running you can pause and resume it at any time. Enable Repeat Timer before starting to run the 900 seconds up to 100 times in a row.
Will I hear an alarm when the time is up?
Yes, if Enable Alarm is checked. You can choose between 13 alarm sounds and preview them before starting. Keep the browser tab open and the sound of your device switched on.
Do I need to install anything?
No. FinalTimer works directly in your browser on desktop, tablet and smartphone. There is no app, no registration and no cost.
Start Your 900 Second Timer Now
A clear time frame turns intentions into action. Set your 900 second timer, commit to the task in front of you and let FinalTimer keep track of the 15 minutes. No app, no account, completely free.
Plan Your 900 Seconds
Numbers that help you use the 900 second timer in practice, all calculated for exactly 15 minutes.
When Does a 900-Second Countdown End?
Starting soon? Here is when the countdown ends for typical start times:
| Start | Timer ends |
|---|---|
| 07:00 (7:00 am) | 07:15 (7:15 am) |
| 09:00 (9:00 am) | 09:15 (9:15 am) |
| 12:00 (12:00 pm) | 12:15 (12:15 pm) |
| 14:30 (2:30 pm) | 14:45 (2:45 pm) |
| 18:00 (6:00 pm) | 18:15 (6:15 pm) |
| 21:00 (9:00 pm) | 21:15 (9:15 pm) |
Countdown Milestones
- A quarter done: after 3 minutes and 45 seconds, with 11 minutes and 15 seconds remaining.
- Halfway point: after 7 minutes and 30 seconds, with 7 minutes and 30 seconds remaining.
- Three quarters done: after 11 minutes and 15 seconds, with 3 minutes and 45 seconds remaining.
- Last 10 percent: after 13 minutes and 30 seconds, with 1 minute and 30 seconds remaining.
Speakers, teachers and exam supervisors often give a warning at the 75 % or 90 % mark. Add a second timer for the warning if you want an extra alarm.
Intervals That Fit Into 900 Seconds
- Tabata-style 20/10: 30 rounds of 20 seconds work and 10 seconds rest, which makes 3 complete 4-minute Tabata blocks.
- 30/30 intervals: 15 rounds of 30 seconds on and 30 seconds off.
- EMOM (every minute on the minute): 15 minutes, each starting with a fixed set of reps.
Calories Burned in 900 Seconds
Estimated energy use for common activities, calculated with MET values from the Compendium of Physical Activities (kcal = MET × body weight in kg × hours). Real values vary with fitness, age and intensity.
| Activity | 60 kg (132 lb) | 80 kg (176 lb) |
|---|---|---|
| Walking (4.8 km/h · 3 mph) | 53 kcal | 70 kcal |
| Brisk walking (5.6 km/h · 3.5 mph) | 65 kcal | 86 kcal |
| Jogging, general | 105 kcal | 140 kcal |
| Running (9.7 km/h · 6 mph) | 147 kcal | 196 kcal |
| Cycling, moderate (19-22 km/h) | 120 kcal | 160 kcal |
| Swimming laps, moderate | 87 kcal | 116 kcal |
| Jumping rope, moderate | 177 kcal | 236 kcal |
| Hatha yoga | 38 kcal | 50 kcal |
How Far You Get in 900 Seconds
Distance covered at typical average speeds without stops:
| Way of moving | Speed | Distance |
|---|---|---|
| Walking | 5 km/h | 1.25 km (0.78 mi) |
| Running | 10 km/h | 2.5 km (1.55 mi) |
| Cycling | 20 km/h | 5 km (3.11 mi) |
| Car on the motorway | 100 km/h | 25 km (15.5 mi) |
| High-speed train | 300 km/h | 75 km (46.6 mi) |
900 Seconds Compared With Real-World Durations
- 14:00: A rugby sevens match has only 14 minutes of playing time: two halves of seven minutes. (1 minute shorter than this timer)
- 15:00: Half-time in a football (soccer) match lasts 15 minutes. (same length as this timer)
- 15:00: Each quarter of an NFL game lasts 15 minutes of game time. (same length as this timer)
- 15:28: Alan Shepard’s Freedom 7, the first American human spaceflight in May 1961, lasted 15 minutes and 28 seconds. (28 seconds longer than this timer)
- 17:30: White rice usually simmers for about 15 to 20 minutes before it is ready. (2 minutes and 30 seconds longer than this timer)