Time & Productivity Tools
Free timers, schedulers, and time calculators. Everything runs in your browser — no sign-up, no notifications spam, no tracking.
Pomodoro Timer Full guide →
How it works
The Pomodoro Technique alternates 25-minute focused work sessions ("pomodoros") with 5-minute short breaks. After 4 pomodoros, you take a longer 15-30 minute break. Adjust the lengths above to fit your attention span — newer practitioners often start with 15/3 splits.
When to use it
Deep-focus work like writing, coding, studying, or anything that benefits from breaking a large task into chunks. Timer cycles also help fight procrastination — committing to "just 25 minutes" is easier than committing to a whole task.
Common mistakes
Skipping breaks ("I'm in flow"). Breaks are not optional — they're how the technique prevents burnout and decision fatigue. Also: checking the timer constantly. Start it and forget it until the bell.
Stopwatch
How it works
Tracks elapsed time at 10-millisecond resolution using performance.now(), the browser's high-precision monotonic clock. Lap times are stored in memory only — closing the tab clears them.
When to use it
Timing workouts, cooking steps, productivity sprints, page load tests, or anything where you want elapsed time without committing to a full Pomodoro cycle.
Common mistakes
Confusing this with a countdown timer. A stopwatch counts up from zero with no end; a countdown timer counts down from a target to zero.
Countdown Timer
How it works
Set hours, minutes, and seconds, then start. The timer counts down to zero and alerts you. The browser tab title also shows the remaining time so you can see it from another tab.
When to use it
Cooking, presentations, board games, kid time-outs, intervals during workouts, or any task with a hard deadline.
Common mistakes
Closing the tab — the timer pauses if the tab is fully unloaded. Browsers throttle JavaScript timers in background tabs, so the actual time may run a few seconds slow if you switch away. Use a phone alarm for anything truly mission-critical.
Workday Hours Calculator
Hours worked
How it works
Subtracts clock-in from clock-out, then deducts your unpaid break minutes. If clock-out is earlier than clock-in, the calculator assumes you worked an overnight shift and adds 24 hours.
When to use it
Filling in timesheets, calculating overtime, checking how long you actually worked vs how long you were at the office, or estimating freelance billable hours.
Common mistakes
Forgetting unpaid breaks. In most US states, lunch breaks of 30+ minutes are unpaid. Short rest breaks under 20 minutes are typically paid. Check your state and your employer's policy.
Sleep Cycle Calculator
Go to bed at one of these times:
Each option = a complete number of 90-minute sleep cycles. 14 minutes added to fall asleep.
How it works
The average sleep cycle is 90 minutes, moving through light sleep, deep sleep, and REM. Waking at the end of a complete cycle leaves you feeling more rested than waking mid-cycle. The calculator gives you 4-6 cycle options (6, 7.5, or 9 hours), plus 14 minutes for the average time it takes to fall asleep.
When to use it
Planning bedtime when you have a fixed wake time, or planning a wake time when you have a fixed bedtime. Adults typically need 5-6 full cycles (7.5-9 hours).
Common mistakes
Cycle length varies between people (80-120 minutes). The 90-minute number is an average. If you consistently feel groggy at the calculator's recommended times, your personal cycle is probably a bit longer or shorter.
Reading Time Calculator
Reading time
How it works
Reading time = words ÷ words per minute. Speaking time uses ~130 wpm, which is typical for podcasts, audiobooks, and slow-spoken presentations. News broadcasters average ~150 wpm, conversational speech is ~160 wpm.
When to use it
Sizing blog posts ("8 min read"), planning presentation length, estimating audiobook listening time, or sanity-checking essay length against required time.
Common mistakes
Using "average" speeds for technical content. Code, math, and dense academic prose read 30-50% slower than novels or news.
Running Pace Calculator
Pace
How it works
Pace = total time ÷ distance. The calculator converts between miles and kilometers (1 mile = 1.609 km), so you can enter your run in either unit and see your pace per both. Speed is the inverse: distance per unit of time.
When to use it
Planning a race target, comparing training runs, or converting a treadmill pace from one unit to another. Most US 5K and marathon races report results in minutes per mile; international and track events use minutes per km.
Common mistakes
Pace and speed are inverses of each other, but they're easy to mix up. A faster runner has a *lower* pace (fewer minutes per mile) and a *higher* speed (more miles per hour).