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Stopwatch with lap times and countdown timer with alarm sound. Precision timing using requestAnimationFrame.
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Start the timer
Click start to begin timing.
Record lap times
Click lap to record split times as you go.
Stop and review
Stop the timer and review your recorded lap times.
Calculate percentages: what is X% of Y, X is what % of Y, and percentage change.
On your computer · Nothing uploadsFree online scientific calculator with trig, logarithms, exponents, and more. Supports keyboard input.
On your computer · Nothing uploadsAdd, subtract, multiply, and divide fractions. See step-by-step solutions with simplified results.
On your computer · Nothing uploads