ETA Calculator
Calculate estimated completion time (ETA) from a start time and duration. Timezone-aware results with countdown, ISO 8601, and Unix timestamp output. Free and private.
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What is ETA Calculator?
The ETA Calculator is a timezone-aware tool that computes the exact completion time for any task, delivery, or event from a start time and a duration. Instead of doing timezone math by hand, you pick a start time, enter how long the work takes, and instantly see the finish time in your chosen timezone along with an ISO 8601 timestamp, a Unix epoch value, and a human-readable countdown. Everything runs in your browser with no sign-up and no data sent anywhere.
Key Benefits
- Eliminate manual timezone offset calculations for distributed teams
- Get developer-ready ISO 8601 and Unix timestamp output in one click
- See a live countdown so you know if a deadline is near or already past
- Coordinate releases, deliveries, and meetings across continents accurately
- 100% client-side and private — no schedules leave your device
Common Use Cases
- •Estimating CI/CD pipeline or build completion times across regions
- •Planning delivery windows for logistics and e-commerce operations
- •Scheduling cross-timezone meetings with a shared, unambiguous end time
- •Calculating task deadlines for project management and sprint planning
- •Converting a duration into a precise calendar event time for invites
How to Use the ETA Calculator
- Set the start time: Pick the start date and time using the datetime-local picker. It defaults to right now, so you can calculate from the current moment instantly.
- Choose a timezone: Select a timezone from the dropdown to display the result in the correct local time for your team or audience.
- Enter the duration: Type the expected duration in hours and minutes. Both fields accept decimals, so 1.5 hours works as well as 1 hour and 30 minutes.
- Read and copy the ETA: The completion time, countdown, ISO 8601 string, and Unix timestamp appear instantly. Click Copy to share the start, end, and duration block.
Key Features
- Pick from 18 common IANA timezones or use local device time
- Enter hours and minutes separately for minute-precise scheduling
- Three output formats: formatted local time, ISO 8601, and Unix timestamp
- Live relative-time countdown like in 2 hours or 3 days ago
- One-click copy of start, end, and duration block
- 100% client-side and private — no data leaves your browser