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Natural language input, smart output modes, and keyboard-first design — everything you need to work with time durations right from your browser.
Free · No account · No data collected
Built for developers, project managers, freelancers, and anyone who works with time.
Chain multiple time values with + and − operators. Build complex expressions step by step and see the full equation before calculating.
Type 3h 23m 44s, 1d 4h, or 2y 3mo 1w — no rigid format required. Mix and match any supported units freely.
Instantly convert durations to work days, weeks, and months using an 8h/day · 5d/week · 160h/month reference — perfect for billing.
Switch between Clock, Natural, Work, Hours-only, and All-formats views. Your preferred mode is saved automatically across sessions.
Press + to commit and add, − to subtract, Enter to calculate, ⌫ to undo, and Esc to clear — never touch the mouse.
Zero data collection. No network requests. Your mode preference is stored locally in your browser only. No accounts, no tracking, ever.
TimeCalc accepts three flexible input styles. Use whichever feels natural.
y
yr
yearyears
mo
monthmonths
w
wk
weekweeks
d
daydays
h
hr
hourhours
m
minminutes
s
secseconds
Switch output format with one click. Your choice is remembered for next time.
H.MM.SS — hours can exceed 24. Best for countdowns and timers.
Years, months, weeks, days, hours, minutes. Human-readable at a glance.
8h/day · 5d/week · 160h/month. Ideal for billing, project estimation.
Total hours as a decimal. Great for timesheets and spreadsheets.
Every output side by side — clock, natural, work, hours, totals, and more.
Open TimeCalc with Ctrl+Shift+T (or ⌘⇧T on Mac), then calculate without leaving the keyboard.
No analytics, no telemetry, no usage tracking of any kind.
TimeCalc runs entirely offline. Nothing is ever sent to a server.
Only your output mode preference is saved — in your browser, on your device.
Install and use immediately. No sign-up, no login, no email.
Free forever. No sign-up. Works offline. Install in seconds.