ConvertUnits
MEASUREMENT COLLECTION

Time converters

Convert precise durations between milliseconds, seconds, minutes, hours and days. Choose an exact direction below, or open the universal converter for all compatible units.

Example time conversions

Start with a calculated reference value, then open the tool to enter your own measurement. Results marked ≈ are rounded for display.

Understanding time

Decimal duration versus clock-style duration

One minute is 60 seconds and one hour is 60 minutes. A result such as 1.5 hours is one hour and 30 minutes, not one hour and 50 minutes.

How to verify a conversion

The site treats days as exactly 86,400 seconds. Calendar months, leap seconds and local time zones are separate from fixed elapsed durations.

Source definitions: NIST Guide to the SI. See our conversion methodology for calculation and rounding details.

Calculated example: 14,400 seconds to hours.

Accurate calculations, no guesswork

Every converter uses consistent unit definitions and returns an interactive result you can verify. For multiple measurements, use the batch converter.

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