What marks the start and end of the fasting period?

Fajr (astronomical dawn) marks the start and Maghrib (sunset) marks the end — the same two prayer times used by this site's Prayer Times Calculator for the same location and method.

Why does fasting duration change during Ramadan itself?

Fajr and Maghrib times shift a little each day as the sun's position changes, so the exact fasting duration for the same city can vary by several minutes from the start of Ramadan to the end.

Why are fasting hours so much longer in some countries than others?

Latitude is the main driver — locations far from the equator experience much longer or shorter daylight depending on the time of year, which lengthens or shortens the Fajr-to-Maghrib window regardless of calculation method.

What about locations at extreme latitude where standard sun-angle times become unreliable?

This tool only reports the astronomical Fajr/Maghrib times it computes for the coordinates and method you give it; it doesn't apply any special extreme-latitude adjustment. Check your local Islamic authority for guidance if you're in such a location.

Does the calculation method affect Maghrib as well as Fajr?

Only slightly — Maghrib (sunset) is astronomically well-defined and consistent across methods; nearly all of the variation between methods comes from how each authority defines the Fajr (dawn) angle.

Can I check fasting hours for a date outside Ramadan?

Yes — the tool calculates the Fajr-to-Maghrib duration for any date and location you enter, not just Ramadan dates, though it's most commonly used for Ramadan planning.

Is this the same as the time between Suhoor and Iftar?

Essentially yes — Suhoor should end by Fajr and Iftar begins at Maghrib, so the fasting duration shown here is the same window most people track as "Suhoor to Iftar."

Which calculation method should I choose?

Use whichever method your local mosque or national Islamic authority follows, since that's the standard your community's fasting times are actually based on — this tool doesn't recommend one method as more correct.

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Islamic Tools

Ramadan Fasting Hours

Fajr-to-Maghrib fasting duration for any location, date, and calculation method.

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Last reviewed 2026-09-06

About the Ramadan Fasting Hours

Computes how many hours a Ramadan fast lasts (Fajr to Maghrib) for any location, date, and calculation method.

100% Free Runs in Your Browser No Sign-Up Required

How to use it

Select your location.
Enter the date.
Choose a calculation method.
Read the fasting duration and the Fajr/Maghrib times.

Formula

Fasting duration = Maghrib time − Fajr time, both computed astronomically for the given coordinates and date (same engine as this site's Prayer Times Calculator).

Worked example

New York City, mid-Ramadan: roughly 13-14 hours depending on the time of year, versus much longer fasts in high-latitude locations during a summer Ramadan.

Interpreting your result

Fasting hours shift by a few minutes depending on the calculation method chosen — a genuine regional-authority difference, not a bug — and change day to day and by latitude as Fajr/Maghrib times shift through the year.

Recommendations

• Locations at high latitude can see dramatically longer or shorter fasting hours depending on the season — check your specific city and date rather than assuming a global average.

Frequently asked questions

Because Fajr and Maghrib themselves are defined slightly differently by different regional Islamic authorities (mainly the angle used to define dawn) — a real, named difference, not an error in this tool.