By the Ebbrate editorial team · checked 18 October 2026 against the sources at the end
What the bunker adjustment factor is
Maersk defines the bunker adjustment factor as an adjustment shipping lines apply to offset changes in the cost of bunkers, the fuel ships burn. It is also called the bunker contribution (BUC) or fuel adjustment factor (FAF).
Why the bunker adjustment factor changes
BAF follows fuel prices, and lines usually reset it on a fixed cycle. Fuel rules also matter: cleaner fuels cost more, and the surcharge reflects that. A quote with a low base rate and a high BAF can cost more than the reverse, so compare all-in prices.
US rules on BAF increases
Ocean carriers in US trades must publish their rates, charges and rules in public tariffs. An increase may not take effect earlier than 30 calendar days after it is published; a decrease can apply as soon as it is published.
BAF and other surcharges in a quote
BAF sits alongside terminal handling charges, peak season surcharges and general rate increases. Ask for a quote that includes them all, or that lists those left out. See the freight terms glossary.
Fuel surcharges on Ebbrate
A bid on Ebbrate is the all-in price for the terms you asked for, split by leg, and anything not included must be stated on the bid. See how it works.
Sources
- Maersk: shipping terms glossary
- 46 CFR 520.3 — publication of tariffs
- 46 CFR 520.8 — effective dates of tariff changes
A guide, not legal advice: rules change, and your customs broker has the last word on your entry.