Google Calendar does not have a built-in feature to automatically sum up your total hours, but you can easily calculate them for free using native Google tools, free web applications, or browser extensions. Whether you want to tally up hours for client billing, personal productivity, or work timesheets, multiple free methods can fetch your events and crunch the data instantly. Method 1: Use Free Web Apps (Fastest & Easiest)
Dedicated, privacy-friendly web applications require zero setup and calculate your total hours in seconds.
Google Calendar Hours Calculator: Visit the open-source site Google Calendar Hours Calculator.
Secure Authorization: Click the authentication link to grant read-only access to your calendar data.
Zero Storage: The app processes data directly in your browser using the Google Calendar API and deletes all login data as soon as you close the tab.
Filter Data: View your total accumulated time or filter hours by day, week, month, year, or a custom date range.
Method 2: Use Free Chrome Extensions (Best for Color Coding)
If you organize your calendar by categorizing tasks with different colors (Time Boxing), browser extensions can sum these durations automatically.
Time Counter Extensions: Install a free tool like Time Counter for Google Calendar or Google Calendar Time Spent from the Chrome Web Store.
One-Click Tally: Open your calendar on your computer, and the extension will display a sidebar showing total hours accumulated for each event color.
Time Management: This is perfect for seeing exactly how many hours you spend weekly on specific categories like meetings, solo work, or fitness.
Method 3: Use Google Sheets (Best for Reporting & Customization)
For complete control over data filtering and long-term storage, exporting calendar details into a spreadsheet allows you to calculate totals manually using formulas. Google Calendar Hours Calculator
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