Great Loop Tool

Great Loop Fuel Range Calculator

Use this to sanity-check fuel range before long or sparse sections. It is intentionally simple because false precision is dangerous: real burn changes with load, bottom condition, current, wind, sea state, speed, and engine health.

Maintained by TheCenterOf editors. Last reviewed: 2026-06-10. This page is a planning aid, not navigation, legal, insurance, mechanical, or safety advice. Verify current charts, notices, bridge and lock information, weather, marina terms, insurance language, and local rules before acting.

Range inputs

Fuel capacity (gallons)

Reserve to hold back (%)

Burn rate (gallons/hour)

Cruising speed (knots)

What to verify before trusting the result

Actual usable fuel, not brochure tank capacity.
Burn at the speed you will actually run, not best-case sea-trial burn.
Known current and wind effect on the specific leg.
Fuel dock hours, approach depth, payment limits, and seasonal status.
A bailout stop if the preferred fuel dock is closed or unavailable.