Time Conversion Calculator
Convert between hours, minutes, seconds, and days instantly. Transform any time unit into all other units with real-time two-way conversion.
Convert Between Any Time Units
Enter a duration in any unit and the Time Conversion Calculator converts it to all other time units automatically. The tool handles hours to minutes, seconds to hours, minutes to days, and every combination in between.
Quick 3-step process to convert time units:
- Enter the time value you want to convert in the appropriate field (hours, minutes, or seconds).
- The calculator converts the value to all other units in real time — no submit button needed.
- Read the converted values in each unit column or use the result panel for combined HH:MM:SS output.
Add multiple rows to convert and sum several time values simultaneously. Each row converts independently before the calculator combines all entries.
Set any row to subtract to find the difference between two converted values or to deduct a converted duration from a running total.
The Base-60 Number System
Time uses the sexagesimal (base-60) system inherited from ancient Babylonian mathematics. Every 60 seconds equals 1 minute, every 60 minutes equals 1 hour, and every 24 hours equals 1 day.
Sexagesimal System: A numeral system with 60 as its base, used for measuring time (60 seconds per minute, 60 minutes per hour) and angles (60 minutes per degree).
Unit Conversion: The mathematical process of expressing a quantity in a different measurement unit while preserving the same total value.
Core time conversion factors:
- 1 day = 24 hours = 1,440 minutes = 86,400 seconds
- 1 hour = 60 minutes = 3,600 seconds = 0.0417 days (1 ÷ 24)
- 1 minute = 60 seconds = 0.0167 hours = 0.000694 days (1 ÷ 1,440)
Click any card in the diagram to change the reference unit. Enter a value in the live converter to see all conversions update simultaneously.
The base-60 system means conversions require multiplication or division by 60 — not 10 or 100 like decimal systems.
Time unit conversions are used in scientific calculations (e.g., converting milliseconds to hours), logistics (e.g., delivery windows in minutes), and finance (e.g., billable hours in decimal format).
Time Conversion Examples and Practical Uses
Explore 4 common scenarios where converting between time units simplifies calculations:
Convert Seconds to Hours and Minutes
Convert 9,450 seconds into hours and minutes. The result — 2 hours 37 minutes 30 seconds (02:37:30) — translates a stopwatch reading into a human-readable time.
Convert Minutes to Days and Hours
Convert 4,320 minutes into days. The result — 72 hours or 3 days (72:00:00) — scales a project estimate from minute-level tracking to day-level planning.
Convert Hours to Weeks
Convert 168 hours into a standard time frame. The result — 168 hours (168:00:00) — equals exactly 1 week (168 ÷ 24 = 7 days) for project scheduling.
Combine Mixed Time Units
Add 2 hours, 90 minutes, and 1,800 seconds together. The calculator converts each entry and sums the total — 4 hours 0 minutes (04:00:00) — automatically normalizing all units.
Multi-Unit Conversion Tables
The result panel converts the total into HH:MM:SS, total minutes, and total seconds simultaneously. These 3 formats cover standard time displays, billing entries, and granular data exports.
The live converter updates all 3 unit fields (hours, minutes, seconds) simultaneously. Editing any field recalculates the other two in real time.
For conversions involving days, divide total hours by 24. A result of 72 hours equals 3 days (72 ÷ 24 = 3). The calculator does not display a days column — divide manually.
Frequently Asked Questions
Everything you need to know about converting between time units, the base-60 system, and multi-unit calculations.