VFR Weather Minimums
Airspace class + altitude + day/night → required visibility and cloud clearance. The §91.155 table, looked up for you.
Inputs
Your indicated altitude above mean sea level.
Only used when the airspace class is Class G.
Required minimums
Enter altitude (MSL)
Then we'll surface the §91.155 minimums.
Full §91.155 reference table
vis · below · above · horizontal
| Airspace | Altitude | Day | Night |
|---|---|---|---|
| A | Any | IFR only — VFR not permitted | |
| B | Any altitude | 3 sm · clear of clouds | 3 sm · clear of clouds |
| C | Any altitude | 3 sm · 500/1000/2,000 ft | 3 sm · 500/1000/2,000 ft |
| D | Any altitude | 3 sm · 500/1000/2,000 ft | 3 sm · 500/1000/2,000 ft |
| E | Less than 10,000 ft MSL | 3 sm · 500/1000/2,000 ft | 3 sm · 500/1000/2,000 ft |
| E | At or above 10,000 ft MSL | 5 sm · 1000/1000/1 sm | 5 sm · 1000/1000/1 sm |
| G | 1,200 ft AGL or less | 1 sm · clear of clouds | 3 sm · clear of clouds |
| G | More than 1,200 ft AGL, less than 10,000 ft MSL | 1 sm · 500/1000/2,000 ft | 3 sm · 500/1000/2,000 ft |
| G | More than 1,200 ft AGL, at or above 10,000 ft MSL | 5 sm · 1000/1000/1 sm | 5 sm · 1000/1000/1 sm |
Source: 14 CFR §91.155 (verbatim). A Class G exception exists for airplane operations in the traffic pattern of an airport with an operating control tower at night below 1,200 ft AGL — see §91.155(b) for that exception; not modeled here.
About this lookup
The §91.155 table is one of the most-consulted regs in everyday VFR flying, but the way it's laid out in the CFR — one giant table indexed by airspace AND altitude AND time-of-day — buries the answer. Pick three values, get one row. Numbers come straight from the regulation.
Special VFR (§91.157), waivers (§91.903), and ATC clearances all modify these baselines. This tool returns the regulatory baseline only.
AutoBrief
AutoBrief checks VFR minimums against the day's weather for every dispatched flight. The chief pilot sees it in the morning brief.
AI pre-flight GO/NO-GO for flight schools.