The number is easy to remember. The details, like the structure exception and AGL vs MSL, are what show up on the test.
The maximum altitude is 400 feet above ground level (AGL). You may go higher only if you stay within 400 feet of a structure. Controlled airspace may set lower limits.
Under Part 107, a small drone may not exceed 400 feet AGL unless a specific exception applies.
You must stay at or below 400 feet above ground level. AGL means height above the ground directly below the aircraft, not above sea level.
If you are flying near a tall structure, such as a tower or building, you may fly higher as long as the aircraft stays within 400 feet of that structure. This is useful for inspections.
In controlled airspace, authorization can specify a lower maximum altitude. LAANC facility maps show the limit for each grid. See What is LAANC?
Altitude on a sectional chart is often MSL (above sea level), while your drone's limit is AGL. Tower heights on charts show MSL with AGL in parentheses. Practice this with the chart decoder.
Expect questions on the 400-foot limit, the structure exception, and converting between MSL and AGL. Try the free practice test.
400 feet above ground level under Part 107, unless you are within 400 feet of a structure.
Yes, if you stay within 400 feet of the structure.
Above Ground Level, the height above the ground directly beneath the aircraft.
Recreational flyers also follow a 400-foot limit, and must follow airspace rules and safety guidelines.
Don't memorize answers — learn why they're right. 800+ practice questions, a timed exam simulator, chart practice in the test's new format, and an AI coach. One-time $39.99. Always verify current rules at faa.gov.