Marine, Shipbuilding & Boat Manufacturing calculator

Shipyard Bay Capacity Calculator

Calculate how many vessels your shipyard can deliver per year based on available production bays, average build cycle time, and realistic facility utilization. Enter the number of enclosed or covered bays (or outdoor building positions), the average weeks a vessel occupies a bay from keel lay to rollout, and your utilization factor accounting for bay prep, maintenance, and schedule gaps. The result helps you validate production plans and justify facility expansion.

What this calculator does

  • Calculate annual vessel throughput for a shipyard or boatbuilding facility based on number of production bays, average build cycle time per vessel, and facility utilization rate.
  • Use it to determine if existing facility bays can support the order book, justify capital investment in additional bays, or evaluate production schedule feasibility.
  • The result estimates how many vessels per year the facility can produce based on bay count and cycle time.

Formula used

  • Available bay-weeks per year = bays x 52 weeks x utilization rate / 100
  • Annual vessel throughput = available bay-weeks / build cycle time per vessel

Inputs explained

  • Number of production bays: Count enclosed building bays, covered positions, or designated outdoor build stations where a vessel can be constructed start to finish.
  • Average build cycle time: Average weeks a vessel occupies the bay from keel lay (or mold load) through rollout to the yard. Include all production phases done in-bay.
  • Bay utilization rate: Percentage of available weeks actually used for production. Accounts for bay prep between vessels, maintenance shutdowns, and schedule gaps. Typical: 75-90%.

How to use the result

  • Use it to validate order book feasibility, justify bay additions, plan shift patterns, and set realistic delivery commitments.
  • Assumes all bays handle similar vessel types. For mixed production (different sizes using different bays), calculate each bay group separately. Does not account for labor constraints independently of bay constraints.

Common questions

  • What counts as a production bay? Any position where a vessel can be built from start to completion (or from one major phase to another). Include enclosed sheds, covered bays, and designated outdoor positions with crane access.
  • How do I improve bay throughput without adding bays? Reduce cycle time through parallel outfitting, modular construction, pre-assembled sub-systems, and eliminating production holds. Increase utilization by reducing changeover time between vessels.
  • What is a typical bay utilization rate? Well-run production boatbuilders achieve 80-90% bay utilization. Custom yacht builders may see 70-80% due to design changes and owner-driven holds. Below 70% signals scheduling or workflow issues.
  • Should I include launch and commissioning time in cycle time? Only include time the vessel occupies the building bay. Once it rolls out or launches, the bay is free. Count post-launch commissioning separately as it uses dock space, not bay space.

Last reviewed 2026-05-12.