Performance Calculator

Enter basic measurements below to calculate your boat's performance.

Use this sailboat performance calculator to turn your boat’s core dimensions into quick, data-driven performance estimates.

What you'll get

At-a-glance performance ratios, a polar chart, and key sailboat performance metrics based on your inputs.
An SBP score. This proprietary score compares your design to similar boats and helps you quickly understand how it performs within its size group. A score of 100 means your boat matches the average performance expectation.
Useful baseline numbers for comparing sailboat designs and evaluating trade-offs.
Instant updates as you adjust dimensions, displacement, and sail areas.

Trust note: These results are estimates and should complement, not replace, manufacturer polar data, measured performance data, or real-world sea trials.

Start mode

Search and load an existing profile to prefill the form.

⚡ Quick Start

Search an existing boat to quickly populate the form:

Search by manufacturer or model

Showing up to 10 matches at a time. Loads dimensions and sail data from database.

Quick presets

275 boats available

Primary Specifications

Length Overall (ft) *

Length overall, including any permanent appendages like fixed bowsprit.

Beam (ft) *

Draft (ft) *

Displacement (lbs) *

Total loaded boat weight used for performance ratios.

Mainsail Area (ft²) *

Headsail Area (ft²) *

Foretriangle working sail area (jib or genoa).

How this sailboat performance calculator works

The calculator starts from the same core measurements you enter in the form: length, beam, draft, displacement, and sail area (mainsail, headsail, plus optional downwind sail area). It converts those values to a common baseline, estimates core performance characteristics, and builds a predicted speed profile across wind angles. From that profile, it computes the handicapping inputs used to produce the SBP score shown in your results.

What this calculator is good for

Use it for fast, consistent comparisons between designs, concept checks when exploring how dimension and sail-plan changes might affect expected performance, and creating a common baseline when discussing boats with your crew, yard, or broker. It is especially helpful for relative ranking because every boat is processed through the same computation pipeline.

What it does not replace

This tool does not replace a full naval architecture review, class-rule measurement certificate, sea trial data, or weather- and crew-specific race analysis. Real-world results still depend on hull condition, rigging setup, loading state, sail inventory quality, trim skill, and local wind/sea state. Treat the calculator output as decision support, not a guaranteed predictor of race outcomes or safety margins.

Calculator FAQ

Why does one missing field prevent a score?: The SBP calculation depends on a complete set of base geometry and sail-area inputs. Missing or non-positive required values break the performance chain, so the calculator blocks output until the required dimensions are valid.
How should I interpret a higher or lower SBP score?: Use SBP primarily as a relative indicator between boats run through the same workflow. Larger score gaps usually indicate stronger expected performance separation than very small gaps.
Should I enter brochure numbers or measured values from my boat?: Measured values from your current setup typically produce the most useful estimate. Brochure values are still useful for screening and early comparisons when real measurements are unavailable.
What changes the score most: length, weight, or sail plan?: It is the combination that matters: hull size and displacement shape the speed potential, while sail area drives available power. Testing small "what-if" edits in the calculator is the fastest way to see which changes move your specific result most.