🛢️
Fuel Planning — Two-Thirds Rule
PROApply the boating safety fuel rule: 1/3 out, 1/3 back, 1/3 reserve.
Capt. Rob StentVerified
MCA Yachtmaster Ocean, MNZ Coxswain (restricted)
Offshore sailing instructor and maritime educator with 30 years of blue-water passages. Author of coastal navigation guides for NZ waters.
Numly Pro
Unlock Fuel Planning — Two-Thirds Rule
Get full results, advanced insights and unlimited access with Numly Pro.
- Access this and 300+ professional calculators
- Advanced insights and detailed breakdowns
- Engineering, trading, clinical and chemistry tools
- Save calculations and track history
- Export results as PDF
- No ads — ever
NZ$9.99/month after trial · Cancel anytime
Related calculators
⛽🧭⛵
Marine Fuel Range Calculator
Estimate range, fuel consumption and reserve for a powerboat or sailing vessel under power.
Nautical Distance / Speed / Time
Solve any two of distance (nm), speed (knots) and time for passage planning.
Hull Speed Calculator
Calculate the theoretical hull speed for a displacement vessel from waterline length.
Was this helpful?0 found helpful