conversions
How Many Seconds in an Hour
Last updated: May 31, 2026
Written by Blake Boege
A seconds-in-an-hour page provides conversions for time measurements. Based on the standard sexagesimal (base-60) system of measuring time, an hour consists of exactly 60 minutes and each minute contains exactly 60 seconds, which calculates to exactly 3,600 seconds in one hour.
Convert hours to seconds and check the standard time conversion rates. Review formulas and common conversion tables.
Quick Answer
Calculate the exact number of seconds in any number of hours instantly.
How Many Seconds in an Hour?
There are exactly 3,600 seconds in an hour.
This unit relation is consistent under standard Coordinated Universal Time (UTC).
Formula: 1 Hour = 60 Minutes × 60 Seconds = 3,600 Seconds
Hours to Seconds Conversion Chart
| Hours (hr) | Minutes (min) | Seconds (sec) |
|---|---|---|
| 1/4 hr (15 min) | 15 min | 900 sec |
| 1/2 hr (30 min) | 30 min | 1,800 sec |
| 1 hr | 60 min | 3,600 sec |
| 2 hr | 120 min | 7,200 sec |
| 8 hr (Shift) | 480 min | 28,800 sec |
| 24 hr (Day) | 1,440 min | 86,400 sec |
Examples
1 Hour
3,600 seconds
0.5 Hours (Half Hour)
1,800 seconds
2 Hours
7,200 seconds
How it works
Time values are structured using a base-60 (sexagesimal) numerical system. To find the number of seconds in one hour, we multiply the minutes in an hour by the seconds in a minute:
1 Hour (hr) = 3,600 Seconds (sec)
Calculation: 60 minutes × 60 seconds = 3,600 seconds
Converting Hours to Seconds
To convert hours to seconds, multiply the number of hours by 3,600:
Example: 3 hours = 3 × 3,600 = 10,800 seconds
To convert seconds back to hours, divide the total seconds by 3,600:
Example: 5,400 seconds = 5,400 ÷ 3,600 = 1.5 hours
Related Time Tools
Explore more calculators for converting time increments:
Related Calculators
More tools from Conversions
Frequently asked questions
There are exactly 1,800 seconds in a half hour (3,600 seconds ÷ 2).
There are exactly 86,400 seconds in a 24-hour day (3,600 seconds/hour × 24 hours).
There are exactly 900 seconds in a quarter hour (3,600 seconds ÷ 4, or 15 minutes × 60 seconds).
There are exactly 604,800 seconds in a standard 7-day week (86,400 seconds/day × 7 days).
Related calculators
Conversions
How Many Ounces in a Gallon
Find out exactly how many fluid ounces are in a gallon. Use our quick converter to switch between gallons and ounces using either US customary or Imperial measurements.
Conversions
How Many Seconds in a Day
Calculate exact time intervals. Convert between days, hours, minutes, and seconds instantly, and learn the math behind standard calendar day calculations.
Conversions
How Many Quarts in a Gallon
Learn the relationship between quarts and gallons. Convert gallons to quarts and vice versa, and explore the volume differences between US and Imperial liquid systems.