Fishery Economics Calculator

This calculator boils a single fishing trip down to the numbers that determine whether it was profitable: gross revenue is simply landed catch weight times dockside price per kilogram, and net profit subtracts the trip's three expense categories — fuel, crew, and gear/repair — from that revenue. From there it derives four supporting figures. Cost per kilogram divides total expenses by catch weight, giving a per-unit cost baseline that's useful for comparing trips of different sizes on equal footing. Profit margin divides net profit by gross revenue to show what share of every landed dollar survives as take-home profit once fuel, crew, and gear costs are paid, which is how you judge whether a trip's economics are actually healthy rather than just nominally profitable.

Revenue per day divides gross revenue by trip duration, which matters because a longer trip spreads fixed costs like crew wages over more fishing time but also ties up the vessel longer. Breakeven catch answers a different question — given your actual expenses and price per kilogram, how much catch would you have needed just to cover costs — by dividing total expenses by price per kilogram; comparing that to your actual catch weight shows your margin of safety. The model treats price per kilogram as a single fixed number for the whole catch, so it doesn't account for mixed-species landings priced differently, and it doesn't factor in ownership costs like vessel depreciation, insurance, or license fees — only the direct, trip-specific expenses you enter. Treat it as a per-trip operating snapshot, not a full business P&L.