Time Converter Online

Switching between seconds, minutes, hours, days, and weeks is straightforward but easy to get wrong in a rush — especially for timeout values in code, video duration calculations, or scheduling. This tool converts any time duration across all standard units instantly.

How it works

Enter a value, pick your source unit, and the tool applies precise conversion ratios client-side. All supported units are shown simultaneously so you can read off whichever one you need.

How to use it

1. Enter your numeric duration value
2. Select the source unit from the dropdown
3. Read the converted values in all units — click any to copy

Supported units

Milliseconds, seconds, minutes, hours, days, weeks, months (30-day), and years (365-day).

A few things worth knowing

• Months and years are approximated: A "month" is 30 days and a "year" is 365 days in this tool's math. Calendar months vary (28–31 days) and years can be 365 or 366, so for calendar-accurate calculations you'll need a date difference calculator
• Milliseconds to seconds: Divide by 1,000 — this is the most common conversion when reading API timeout values or timestamp differences in code
• 1 week = 604,800 seconds: A number that comes up frequently in cache expiry values and token lifetimes

FAQ

How many seconds are in a day? 86,400 (24 × 60 × 60).

How many milliseconds are in an hour? 3,600,000 (3,600 × 1,000).

Why does the month conversion say 30 days instead of the real month length? Calendar months have irregular lengths (28, 29, 30, or 31 days). Using 30 days is the standard approximation for general duration math. For exact calculations between specific dates, use the Date Difference Calculator.

Related Tools

• Date Difference Calculator
• Unit Converter