Is the 30 minutes what I must still have in the tanks when I land?

The rule is a condition of beginning the flight. You plan enough fuel to reach the first point of intended landing and then continue for the reserve, considering wind and forecast weather, at normal cruising speed. It is not a separate in-flight minimum that replaces that planning rule.

What is the first point of intended landing?

It is the first place you intend to land, not automatically the final destination on the nav log. A planned fuel stop is the first point for the fuel on board when you depart. The next leg is planned again from there.

Which “night” does 91.151 use?

Section 91.151 says “during the day” and “at night” and does not define those words. Section 1.1 defines night as the end of evening civil twilight to the beginning of morning civil twilight, and that definition applies when a rule uses “night” without setting a different clock. It is not the sunset-to-sunrise light rule in 91.209, and it is not the one-hour-after-sunset window in 61.57(b). See the night study page for all three.

Does a helicopter use 30 and 45 minutes?

No. Section 91.151(b) is the rotorcraft rule: fuel to the first point of intended landing and then at least 20 minutes at normal cruising speed. It does not split day and night.

Is this the same reserve I use on an IFR flight plan?

No. VFR fuel is 91.151. IFR fuel is a different section, 14 CFR 91.167. Read that section for an IFR flight rather than adding the VFR day or night minutes on top of a guess.

What are the VFR fuel minimums?

Q: What are the VFR fuel minimums?

Under 14 CFR 91.151, an airplane needs fuel to the first point of intended landing plus 30 minutes by day or 45 minutes at night, at normal cruising speed. Rotorcraft: 20 minutes.

For an airplane, 14 CFR 91.151(a) says no person may begin a VFR flight unless, considering wind and forecast weather, there is enough fuel to fly to the first point of intended landing and then, at normal cruising speed, for at least 30 minutes during the day or at least 45 minutes at night. For a rotorcraft, paragraph (b) requires fuel to that same point and then for at least 20 minutes at normal cruising speed. The rotorcraft rule does not add a longer night reserve.

Study aid, not legal advice. Regulations, the AIM, and handbook editions change. Check the current text and confirm anything that affects a flight or a checkride with your CFI.

What the rule actually measures

Section 91.151(a) applies to a flight in an airplane under VFR conditions. Three qualifiers sit in the sentence:

Considering wind and forecast weather. The fuel to reach the landing point is not a no-wind, standard-day guess.
To the first point of intended landing, and then enough to fly after that for the reserve.
Assuming normal cruising speed for the reserve time. The regulation does not say best endurance, and it does not say “30 minutes of fuel remaining at touchdown” as a second test.

Day is at least 30 minutes after that first landing point. Night is at least 45 minutes. Both are airplane rules in paragraph (a). Paragraph (b) is only rotorcraft, and it is 20 minutes with no day/night split.

Which night

“At night” in 91.151 is the word night. 14 CFR 1.1 says night means the time between the end of evening civil twilight and the beginning of morning civil twilight, as published in the Air Almanac, converted to local time. Section 91.151 does not replace that definition.

Position lights in 91.209 run from sunset to sunrise. Passenger-carrying currency in 61.57(b) runs from one hour after sunset to one hour before sunrise. Those are different clocks. Using either of them as the 91.151 “night” reserve is a common oral miss. The three definitions are on the night study page.

Where this shows up on the oral

Section 91.103 requires the pilot in command, before beginning a flight, to become familiar with all available information about that flight. For a flight under IFR or a flight not in the vicinity of an airport, that information must include fuel requirements. The private pilot ACS puts the fuel reserve on the cross-country planning task (PA.I.D). Build the reserve into the nav log you will defend, in normal cruising fuel flow, after wind and the forecast are already in the time to the first landing.

Day 4 of the 30-day oral checklist is that cross-country.

Common examiner follow-ups

Is the 30 minutes what I must still have in the tanks when I land?: The rule is a condition of beginning the flight. You plan enough fuel to reach the first point of intended landing and then continue for the reserve, considering wind and forecast weather, at normal cruising speed. It is not a separate in-flight minimum that replaces that planning rule.
What is the first point of intended landing?: It is the first place you intend to land, not automatically the final destination on the nav log. A planned fuel stop is the first point for the fuel on board when you depart. The next leg is planned again from there.
Which “night” does 91.151 use?: Section 91.151 says “during the day” and “at night” and does not define those words. Section 1.1 defines night as the end of evening civil twilight to the beginning of morning civil twilight, and that definition applies when a rule uses “night” without setting a different clock. It is not the sunset-to-sunrise light rule in 91.209, and it is not the one-hour-after-sunset window in 61.57(b). See the night study page for all three.
Does a helicopter use 30 and 45 minutes?: No. Section 91.151(b) is the rotorcraft rule: fuel to the first point of intended landing and then at least 20 minutes at normal cruising speed. It does not split day and night.
Is this the same reserve I use on an IFR flight plan?: No. VFR fuel is 91.151. IFR fuel is a different section, 14 CFR 91.167. Read that section for an IFR flight rather than adding the VFR day or night minutes on top of a guess.

Sources

Checked against the eCFR, the AIM, and FAA-H-8083-25C on October 29, 2026. The eCFR is updated continuously; the link opens the current section.