Converter
Quick Actions
Batch add hours (one per line)
Exact formula and unit factors
One hour equals 3600 seconds exactly.
seconds = hours × 3600This uses the SI definition: 1 minute = 60 seconds, 1 hour = 60 minutes.
Conversion Table
Example data provided below| # | Hours | Seconds | Rounding | Added | Actions |
|---|
Conversion reference tables
Build reference tables for reports or study notes. Choose a range and step to generate both directions.
| Hours → Seconds | |
|---|---|
| Hours | Seconds |
| Seconds → Hours | |
|---|---|
| Seconds | Hours |
What are hours and seconds?
Hours measure time as sixty-minute blocks in common civil use. Seconds are the SI base unit for time. One hour equals sixty minutes, and each minute equals sixty seconds.
Step-by-step conversion walkthrough
- Write your value in hours.
- Multiply by the factor 3600.
- Round to your preferred number of decimals.
- Record the seconds or add the row to the log.
Decimal hours vs HH:MM input
Use the HH:MM helper to convert hour-minute notation into a decimal. For example, 1:45 becomes 1 + 45/60 = 1.75 hours. Then multiply by 3600 to get seconds.
Common use cases
- Scheduling, service-level tracking, and call center reporting.
- Timesheet, payroll, and billing statements.
- Benchmarking code runtimes and job orchestration windows.
- Science labs and experiments requiring precise time intervals.
Rounding, precision, and accuracy notes
Calculations are exact in base arithmetic: hours × 3600. Only the display rounding changes the shown digits. Choose “Auto” for 0–6 trimmed decimals or force 0–6 fixed decimals.
Batch conversions and export guide
Paste one hours value per line into the batch area. Click Add Lines. Use CSV or PDF buttons to download the table for reports.
Preset durations and quick buttons
Use the quick chips above the converter for common durations like 0.5, 1, 2, 8, and 24 hours. Values are inserted into the input and converted instantly.
Handling large values and overflow notes
Very large inputs may exceed typical integer ranges in some software. This tool uses floating-point math and displays rounded text. For archival outputs, export CSV then process with arbitrary-precision tools if needed.
Leap seconds and civil time caveat
This converter uses the civil hour definition (3600 seconds). Leap seconds occasionally added to atomic time are not considered in everyday conversions.
Related conversions
- Hours to minutes:
minutes = hours × 60 - Hours to milliseconds:
milliseconds = hours × 3,600,000 - Seconds to hours:
hours = seconds ÷ 3600 - Days to seconds:
seconds = days × 86,400
Troubleshooting input errors
- Ensure hours are non-negative numbers.
- For HH:MM, use the helper to convert into decimal hours.
- Remove thousands separators and use a dot as the decimal point.
- If results look odd, reset the form and try again.
How to use this converter
- Enter hours as a number, decimals allowed.
- Select rounding for the display. “Auto” shows full precision.
- Press Convert to calculate seconds instantly.
- Use Add to table to log the result.
- Download your table as CSV or PDF using the buttons.
- Paste multiple hours into the batch area to add many rows.