Private by design
Calculations run in the browser; the tool does not submit or save the values.
Sail Specification Studio
Calculate, compare and prepare a better sail brief
Use transparent formulas, practical selectors and worked examples. Every result shows its assumptions and the checks still requiring a sailmaker or rigger.
Complete planningYacht sail specification studio
Turn verified I, J, P and E rig measurements, sailing program, crew and priorities into sail-area estimates and a quote-ready Australian buying brief.
Open tool
Rig geometryGenoa LP and overlap calculator
Calculate genoa LP percentage, approximate headsail area and the practical category of a working jib, non-overlapping jib or overlapping genoa.
Open tool
Rig geometryMainsail and headsail area calculator
Estimate triangular mainsail, foretriangle and headsail areas from I, J, P, E and LP, with optional mainsail roach allowance and visible formulas.
Open tool
Inventory planningSail inventory wind-range mapper
Map mainsail, working headsail, Code Zero, spinnaker and storm-sail coverage to identify handling gaps and unnecessary overlap in a yacht inventory.
Open tool
MaterialsSailcloth and construction selector
Compare woven polyester, cruising laminate and composite yacht sails using annual use, sailing program, handling tolerance, UV exposure and priorities.
Open tool
Ownership valueYacht sail lifetime-cost calculator
Compare two yacht sail options by delivered price, useful shape life, annual maintenance, expected repairs and estimated cost per useful year or season.
Open tool
Mainsail planningMainsail reefing-area calculator
Estimate remaining mainsail area after one or two reefs using P, E and approximate vertical luff reduction, then prepare reef-depth questions for a sailmaker.
Open tool
Ownership valueYacht sail maintenance planner
Create a practical yacht sail inspection and maintenance schedule based on Australian region, annual use, storage, furling exposure and offshore plans.
Open tool
Handling systemsMainsail reefing-system selector
Compare slab reefing, single-line reefing, in-mast furling and in-boom furling by crew, boat size, shape priority, maintenance and failure tolerance.
Open tool
Headsail planningWorking jib and genoa selector
Compare non-overlapping jibs, overlapping genoas, self-tacking jibs and furling headsails by wind range, crew, rig geometry and handling priorities.
Open toolNew measurement and fit suite
Measure once, compare consistently
Guide the measurements, screen a used sail, save one private project and export the same buying brief to every provider.
Measurement & fit
Yacht sail measurement wizard
Record I, J, P and E yacht rig measurements with clear diagrams, metric or imperial units, endpoint checks and a private saved sail project.
Open tool →
Measurement & fit
Used sail fit analyser
Compare used sail luff, leech, foot and LP dimensions, hardware, clew and UV-cover compatibility with a yacht before arranging inspection or purchase.
Open tool →
Measurement & fit
My Sail Project
Save yacht details, rig measurements and sail quote notes privately in this browser, then reuse the information across Buy Sails Australia planning tools.
Open tool →
Measurement & fit
Downloadable yacht sail buying pack
Turn saved yacht measurements, sailing priorities and quote notes into a consistent sailmaker enquiry brief you can copy, download or print to PDF.
Open tool →
Measurement & fit
Yacht sail buying examples
Explore six worked yacht sail buying examples for trailer sailers, cruisers, offshore yachts, catamarans and club racers, with practical next steps.
Open tool →Important limits
Use outputs as a briefing aid
These tools cannot verify rig loads, dimensions, cloth condition, safe use or final fit. Keep the output with measurements, photos and written provider proposals, then obtain professional verification.
Assumptions shown
Results explain what still needs checking instead of presenting a false pass/fail certificate.
Built for comparison
Each output is designed to improve a provider conversation and written decision record.