Altitude and Flight Level Helper

Convert altitude between flight levels, feet, metres, and kilometres with standard-pressure notes and a quick aviation reference sheet.

Travel & navigation

Altitude and flight level helper

Convert altitude between feet, metres, kilometres, and flight levels, then review the aviation reference sheet that keeps standard-pressure context visible.

Operational note

Flight level values assume standard pressure at 1013.25 hPa / 29.92 inHg. Actual clearances and transition levels remain authority- and procedure-dependent, so use this page as a conversion and briefing aid.

Enter an altitude Enter an altitude or flight level to see the equivalent sheet.

Also in Travel & Navigation

Nautical Distance Converter

Aviation Altitude

Altitude and flight level helper: feet, metres, and FL standard-pressure context explained

An altitude and flight level helper is useful when aviation material moves between cockpit-style feet, international metric references, and pressure-based flight levels. The physical altitude has not changed, but the way it is expressed can shift with procedure, documentation, and phase of flight.

Why flight levels are not just another altitude unit

A flight level is a pressure-based shorthand tied to a standard atmospheric reference rather than a direct geometric height above sea level. FL350, for example, means a constant-pressure surface nominally corresponding to 35,000 feet under standard-pressure assumptions.

That distinction matters because a converter can only show the standard-pressure equivalent. Actual altitude assignment and separation still depend on local transition altitude or level, the current altimeter setting, and the governing procedure.

How the core conversion works

Feet, metres, and kilometres are ordinary distance conversions once the foot-to-metre relationship is fixed. Flight level adds a pressure-based shorthand where one flight-level unit equals one hundred feet under the standard-pressure convention.

The page therefore converts through metres for the geometric values, then expresses the corresponding standard-pressure flight level as the feet value divided by one hundred. That keeps the table internally consistent while still making the pressure caveat explicit.

1 ft = 0.3048 m (exact)

Exact international foot relationship used for feet-to-metre conversion.

1 FL = 100 ft

Flight-level shorthand under the standard-pressure reference model.

How to use the reference sheet

The equivalent table is the direct conversion result for the selected value. The reference sheet below it is there to anchor common aviation checkpoints such as FL100, FL180, and FL350 so your sense check is not just numeric but operationally recognisable.

The warning callout remains important. The table is for conversion and briefing support, not for replacing the altimeter setting, transition-level procedure, or aircraft-specific operating rules used on the day.

Frequently asked questions

What does FL350 mean?

FL350 means flight level 350, which corresponds to 35,000 feet under the standard-pressure flight-level convention. It is shorthand for a constant-pressure surface, not a guarantee of geometric altitude in every real-world condition.

 Why does the page warn about standard pressure?

Because flight levels are pressure-based. Actual operational use depends on the current altimeter setting and the transition altitude or transition level published for the airspace.

 Why keep metres and kilometres on an aviation helper?

Metric references still appear in international documentation, engineering material, and some operational contexts, so keeping them on the same sheet makes cross-checking faster.

Related

More from nearby categories

These related calculators come from the same leaf category, nearby sibling categories, or the same top-level topic.

Nautical Distance Converter

Convert nautical, metric, and imperial route distances, then review chart-scale equivalents and transit-time planning for marine or aviation legs.

Open calculator

Speed Converter

Convert speed between metres per second, kilometres per hour, miles per hour, feet per second, knots, and Mach, with all six units shown at once.

Open calculator

Currency Unit Format Helper

Convert amounts between major and minor money units, then compare standard, accounting, and compact notation across supported currencies with locale-aware formatting.

Open calculator

Natural Gas Converter

Convert natural gas quantities between cubic metres, cubic feet, ccf, Mcf, therms, MMBtu, and kWh using typical delivered-gas heat-content assumptions.

Open calculator

Privacy choices

If you allow analytics, we may use Google Analytics and Microsoft Clarity to better understand how the site is used. Analytics remain off unless you accept.