Professional Time Math
for Editors
Time maths in six trades
Every one of these breaks a normal calculator in a different way.
Everyday Life
When the film ends, how old you are in days, how long until a date. 20:15 + 2h18m.
HR & Payroll
Shifts across midnight, unpaid breaks, decimal hours for payroll. 22:00 to 06:30 - 30m.
Film & Video
SMPTE timecode as a real value, frames and all. 01:23:45:12f24 + 250f.
Developers
Epoch seconds, sprint dates, milliseconds. 1755000000 + 14d, out as ISO 8601.
Accounting
Billable time into man-days and FTE without a spreadsheet. 37h 15m / 8h.
Logistics
Driving blocks, mandatory breaks, what is left of the day. 9h - 4h30m - 45m.
What it does differently
Six things a decimal calculator cannot do at all.
It knows a date from a duration
A duration added to a clock time gives a time of day. Two dates subtracted give a span. Adding two dates is refused, because it means nothing.
One answer, 15 ways to read it
Compact time, decimal hours, work days, timecode, ISO 8601, epoch. Switch without retyping.
Buttons for what you type daily
Whatever you keep typing becomes one key. Set the label and the value.
A week is 40 hours, not 168
Working time does not run on calendar time. Define the steps once and every result respects them.
Keypads built for a trade
Presets for HR, film, accounting, dev and logistics. Rearrange any of them, or start empty.
Same setup on every device
History, layouts and settings follow the account, not the browser.
Simple, Transparent Pricing
Free covers the maths. Pro is for people who reshape the keypad.
Free
Everything you need for everyday time calculations.
- All time units & date formats
- All output formats (compact, hours, fps, ...)
- Ratio & step converters
- 1 custom layout with up to 3 buttons
- Cloud sync (limited history)
- Keyboard shortcuts
Pro
billed annually ($23.88/yr)
30-day free trial included
Full power for professionals — unlimited layouts, customization, and cloud sync.
- Everything in Free, plus:
- Unlimited custom layouts
- Unlimited custom buttons with custom colors
- Unlimited cloud history
- Full cloud sync across devices
TCalc in Your Pocket
The Android app is out. Download the APK below; store listings are still in review.
