40-Minute Timer
Press start. It counts down to zero and rings an alarm — nothing to download, nothing to sign up for.
About this 40-minute timer
A one-click 40-minute countdown, most often used for a full workout or class, baking loaf cakes, or a long focus session. It runs in your browser and rings when it reaches zero.
Forty minutes
Forty minutes is a popular length for a full home workout or spin class, a lesson period at many schools, and a common bake time for loaf cakes and casseroles. It's long enough for real progress on a task but still under the point where most people's concentration fades.
40 minutes in other units
| Seconds | 2,400 |
|---|---|
| Minutes | 40 |
| Hours | 0.667 |
| Milliseconds | 2,400,000 |
| Share of a day | 2.78% |
Tips for using a 40-minute timer
- Many spin and HIIT classes run 40-45 minutes including warm-up and cool-down.
- Loaf cakes and banana bread are often 40-60 minutes — check with a skewer at 40.
- For deep work, 40 minutes plus a 5-minute break is a gentler alternative to the 52/17 split.
Frequently asked questions
How do I set a 40-minute timer?
Press Start above and the page counts down from 40 minutes on its own — nothing to type. Need a little longer? Press +1 min while it runs, or pick a nearby duration from the list.
How many seconds are in 40 minutes?
40 minutes is 2,400 seconds — 40 minutes or 0.667 hours. That's 2.78% of a day.
What is a 40-minute timer good for?
People commonly use a 40-minute timer for a full workout or class, baking loaf cakes, or a long focus session.
Will it keep time if I switch tabs?
Yes. The countdown is measured against your device clock rather than counting screen refreshes, so it stays accurate in a background tab and the alarm fires on time. Some browsers need one click on the page before they allow sound.