Stopwatch Timer
Free Stopwatch Timer for tools. Free online tool with accurate results using verified formulas. Includes worked examples, FAQ, and instant calculations.
Formula
Result = Model(inputs)
This Stopwatch Timer computes results from your provided inputs using the calculator's underlying model.
Worked Examples
Example 1: Workout Intervals
Problem:Time a 30-second sprint.
Solution:Click Start. Watch display until 00:30.00. Click Pause. Rest.
Result:Accurate interval training
Example 2: Productivity
Problem:Track time spent on a task.
Solution:Click Start when beginning work. Click Pause when taking a break. Total time shows productive hours.
Result:Time tracking
Example 3: Race Splits
Problem:Record lap times for a runner.
Solution:Click Start at gun. Click Lap every time runner passes line. Review list for individual lap performance.
Result:Split analysis
Frequently Asked Questions
How accurate is this online stopwatch?
This stopwatch updates every 10 milliseconds (centi-seconds) and uses your browser's internal clock. It is accurate enough for workouts, cooking, and study sessions. However, for professional sports or scientific experiments requiring microsecond precision, specialized hardware is recommended.
What is the difference between a stopwatch and a timer?
A stopwatch counts UP from zero (measuring elapsed time). A timer (or countdown) counts DOWN from a set time to zero (measuring remaining time).
How do I reset the stopwatch?
Click the 'Reset' button (refresh icon). This will stop the timer, set it back to 00:00.00, and clear all recorded laps.