Calrows
How to track billable hours from Google Calendar™
Updated 4 October 2026
If you already block client work in Google Calendar, your billable hours are already recorded. You only need them as numbers. Here is how to turn a month of calendar time into hours and amounts per client.
Name events so they add up
Start event titles with the client: "Acme: design review", "Acme: call", "Birch: workshop". That one habit lets you filter and total by client later.
Build the billable hours sheet
- Install Calrows from the Google Workspace Marketplace (free), open your sheet, then go to Extensions › Calrows › Open sidebar.
- Pick the calendar you log work in (calendars shared with you are listed too).
- In Timesheet, choose the month, type the client name (for example Acme) in Only titles containing, and enter your hourly rate.
- Click Build timesheet.
You get one row per event (date, title, start, end, hours, rate, amount), a total, and a summary by event title. All-day events are left out, since a holiday isn't billable time. Hours are rounded to two decimals, so 45 minutes is 0.75.
For agencies and teams
Run the timesheet once per person's calendar, or on a shared team calendar, and you can see where the team's hours go per client, which is how agencies spot under-billed work. Team plans cover everyone with one payment.
See also: how to make a timesheet from Google Calendar and exporting Google Calendar to Google Sheets.
The free plan builds timesheets of up to 50 events at a time. Pro has no limit and is a one-time payment with no auto-renewal.
Frequently asked questions
Do I need a separate time tracker?
Not if your work is already in Google Calendar. Calrows reads the events you already have.
Can I bill different clients at different rates?
Yes. Build one timesheet per client with its own rate, using the client name filter.
Can I export it to Excel for my invoice?
Yes. The timesheet is a normal Google Sheet: File › Download › Microsoft Excel (.xlsx).