# Hours to Days Converter URL: https://speedycalculator.com/calculators/conversion/hours-to-days/ Last updated: 2026-10-25 > Convert hours (h) to days (day): 1 hour = 0.041666667 day, so multiply by 0.041666667 or divide by 24. Both fields are editable, so you can also type in days and get hours back. ## Inputs - Hours (h) ## Results - Days ## Formula ``` 1 h = 0.041666667 day 1 day = 24 h day = h × 0.041666667 ``` ## Explanation Divide hours by 24 to get days. Shipping estimates, battery life and fasting windows are often given in hours. ### How to use the Hours to Days Converter - Type the number of hours into the **Hours** field. Decimals such as 36 are fine. - Read the answer in **Days** – it updates as you type, with no button to press. - To convert the other way, type into **Days** and the hours are recalculated. - Press **Copy results** to copy both values with the page title, or **Copy link** to share this exact conversion. This page converts only h ⇄ day. Need a different unit? Use the general time converter, where you can choose any “from” and “to” unit. ### How it works Both units measure time, so they are always in the same ratio: one hour equals 0.041666667 days. The calculator multiplies the number of hours you type by 0.041666667 to give days, and when you type into the days field it divides by the same factor to give hours. Because the ratio never changes, doubling the hours always doubles the days. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation). ### How to convert hours to days - Write down the value in hours, for example **72 h**. - Multiply by the conversion factor 0.041666667 (because 1 hour = 0.041666667 day). - 72 × 0.041666667 = **3 day**. - To go back from days to hours, divide by 0.041666667 – or multiply by 24. ### h to day conversion table HoursDaysDaysHours1 h0.041666667 day1 day24 h6 h0.25 day2 day48 h12 h0.5 day5 day120 h24 h1 day10 day240 h36 h1.5 day20 day480 h48 h2 day50 day1,200 h72 h3 day100 day2,400 h96 h4 day1,000 day24,000 h100 h4.1666667 day120 h5 day168 h7 day1,000 h41.666667 day ### What is an hour? An hour is 60 minutes or 3,600 seconds. Wages, shifts and travel times are counted in hours. ### What is a day? A day is 24 hours or 86,400 seconds. Calendar days occasionally differ by one second when a leap second is added. ### Quick mental conversion For a fast estimate, multiply hours by about **0.042** to get days; the error is about 0.8%. Use the calculator above when you need the exact figure. ### Common mistakes to avoid Treating every month as 30 days or every year as 365 days in long calculations, and writing decimal hours such as 1.5 h as 1 h 50 min (it is 1 h 30 min). ## Worked example Inputs — Hours: 72 h. Results — **Days = 3 day**. ## FAQ **How many days is 72 hours?** 3 days. **How many hours in a week?** 168. **How do I convert hours to days?** Multiply the number of hours by 0.041666667. For example, 72 h × 0.041666667 = 3 day. **How do I convert days back to hours?** Divide by 0.041666667 (or multiply by 24), or simply type the value into the days field above. **What is 100 h in days?** 100 h = 4.1666667 day. **What is 1,000 h in days?** 1,000 h = 41.666667 day. **Is this conversion exact?** Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit. **Can I convert to other units on this page?** This page converts only between hours and days. To pick any time unit, use the general time converter linked under Related calculators. **What formula does the Hours to Days Converter use?** 1 h = 0.041666667 day. ## Sources - [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811) - [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)