Convert Hours to Seconds

Convert hours to seconds in one step with this hours-to-seconds calculator. Enter any number of hours to get the exact total seconds right away.

Hours

Seconds to Hours

How many hours in a seconds?

In 1 hours there are 3,600 seconds. Meanwhile in 1 seconds there are 0.000278 hours. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Seconds to Hours calculator above to convert any number.

* Values rounded to 6 decimal places for readability

How to convert hours to seconds?

To convert hours to seconds, use this rule:

1 hour = 3,600 seconds

Multiply the number of hours by 3,600:

seconds = hours × 3,600

Examples:

2 hours × 3,600 = 7,200 seconds
0.5 hours × 3,600 = 1,800 seconds
1.25 hours × 3,600 = 4,500 seconds

Tip: This works because 1 hour = 60 minutes and 1 minute = 60 seconds, so 60 × 60 = 3,600.

Frequently asked questions

How many seconds are in an hour?

There are 3,600 seconds in 1 hour.
That comes from 60 minutes per hour and 60 seconds per minute: 60 × 60 = 3,600.

What is the formula to convert hours to seconds?

Use this simple formula:
seconds = hours × 3,600

If you have a decimal hour, the same formula works.

How do I convert 2 hours to seconds?

Multiply hours by 3,600:
2 × 3,600 = 7,200 seconds

How do I convert 0.5 hours to seconds?

Half an hour is 0.5 hours. Multiply by 3,600:
0.5 × 3,600 = 1,800 seconds

How many seconds are in 1.25 hours?

Multiply 1.25 by 3,600:
1.25 × 3,600 = 4,500 seconds

This also matches 1 hour (3,600) plus 15 minutes (900).

How many seconds are in 24 hours?

A day has 24 hours. Multiply by 3,600:
24 × 3,600 = 86,400 seconds

How do you convert hours, minutes, and seconds into total seconds?

Convert each part, then add them:

hours × 3,600
minutes × 60
seconds × 1

Total: (hours × 3,600) + (minutes × 60) + seconds

Example: 1 hour, 2 minutes, 3 seconds
= (1 × 3,600) + (2 × 60) + 3
= 3,600 + 120 + 3
= 3,723 seconds

How do you convert seconds back to hours?

Divide seconds by 3,600:
hours = seconds ÷ 3,600

Example: 7,200 seconds ÷ 3,600 = 2 hours

Why does 1 hour equal 3,600 seconds?

Time units are built on base-60 steps:

1 hour = 60 minutes
1 minute = 60 seconds

So one hour is 60 × 60 seconds, which equals 3,600.

Can I convert negative hours to seconds?

Yes. The math stays the same:
seconds = hours × 3,600

Example: -2 hours × 3,600 = -7,200 seconds

How many seconds are in 1 hour and 30 minutes?

Convert 1.5 hours to seconds:
1.5 × 3,600 = 5,400 seconds

You can also do it in parts:
1 hour = 3,600 seconds, 30 minutes = 1,800 seconds, total = 5,400 seconds

What’s the quickest way to estimate hours to seconds?

Use 3,600 seconds per hour.
For a rough estimate, round the hours first, then multiply by 3,600. For exact results, use the full number, including decimals.

How does this converter work?

The Calculate Box tool to convert hours to seconds uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a hours value in the box and have it instantly converted to seconds.