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TTL Converter

Convert DNS TTL (time to live) values between seconds, minutes, hours and days.

What this tool does

Convert DNS TTL (time to live) values between seconds, minutes, hours and days. Type an amount in seconds, choose the units, and the tool converts it to hours. It offers 4 time units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Second, Minute, Hour, Day. Starts as Second.
  • To: Choose one of the same 4 units as "From". Starts as Hour.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from seconds to hours:

  • 1 s ≈ 0.000277778 h
  • 5 s ≈ 0.00138889 h
  • 10 s ≈ 0.00277778 h
  • 50 s ≈ 0.0138889 h
  • 100 s ≈ 0.0277778 h

Multiply the number of seconds by about 0.000277778 to get hours. The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Second: SI Brochure, 9th edition (2019). Hour: SI Brochure, 9th edition (2019), Table 8.

Limitations

  • Converts a length of time between units. It does not work out the time between two calendar dates.

FAQs

Q: How many hours are in one second?
A: One second is 1/3600 of an hour, about 0.000278 hours. Change the From and To boxes to convert any other pair of units.
Q: Can I convert the other way, from hours to seconds?
A: Yes. Swap the From and To units. One hour is 3,600 seconds.
Q: What TTL should I use for DNS records?
A: The right value depends on how often the record changes and how quickly you need a change to reach users. This converter only translates between units; it does not recommend a value.

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