IRC rating calculator
Estimate your boat's TCC before you commit to a certificate — free, from the IRC Center at UK Sailmakers.
Your boat
Metric units (m / kg), straight off your existing certificate or brochure specs.
Fill in every field — numbers only.
Your estimate
ESTIMATED TCC
± 0.010 typical vs. issued certificates
Upwind sail area m²
SA / displacement
Fleet position
An estimate for planning only — not an official IRC rating. Certificates are issued by RORC Rating through your national authority.