Stopwatch & Timer
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High-Precision Browser Timer & Stopwatch
Track elapsed time, interval splits, and countdown alerts using client-side JavaScript time APIs.
Calculation & Methodology
Elapsed Time = Performance.now() - Timestamp_Start
Track Billable Hours for Invoices
Convert tracked time into clean client invoices and payment requests.
Create Free InvoiceFrequently Asked Questions
Does the timer stay accurate if I change browser tabs?
Yes, modern implementations calculate elapsed time by comparing epoch timestamps rather than naive interval ticks.
Can I record split laps?
Yes, lap times capture the delta between split triggers without interrupting continuous clock counting.