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Oday 31
Designer: C. Raymond Hunt Associates  ·  Builder: O'day Corp. (Usa)  ·  First built: 1985
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About the Oday 31

Built during the mid-1980s by O'Day Corporation, this 30-foot cruiser represents the company's effort to create an affordable yet capable coastal sailing yacht during their final years of production. Designed by the respected C. Raymond Hunt Associates, the O'Day 31 features a modern fin keel and spade rudder configuration that delivers responsive handling and solid windward performance. With a moderate displacement of 10,100 pounds and a healthy ballast ratio, this masthead sloop strikes a practical balance between stability and performance. The generous beam of 10.75 feet provides comfortable interior space while maintaining reasonable stability characteristics, as evidenced by the capsize screening formula of 1.99. The sail area to displacement ratio of 14.98 suggests adequate power for coastal cruising without being overly demanding for shorthanded sailing. Only 150 hulls were completed during the brief production run from 1985 to 1988, making these boats relatively uncommon today. The fiberglass construction and straightforward systems make the O'Day 31 well-suited for coastal cruising and weekend sailing. While not designed for serious offshore passages, the boat's moderate proportions and Hunt pedigree deliver reliable performance for sailors seeking a comfortable, manageable cruiser at an accessible price point.

Market Price Estimate Beta
Small sample size. This estimate is based on fewer than 5 listings and may not be representative of the true market. Use with caution.
$1,234 – $18,000
typical asking price
Median $18,000  ·  3 listings used
All listings
$1,234 – $18,000 3
Rate a listing price
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About this estimate
  • Prices are based on recent asking prices from public listings — not actual sale prices, which are typically lower.
  • Condition is not factored in. A well-maintained boat with new sails and engine can be worth significantly more than a project boat of the same model.
  • Location affects price. Boats in landlocked states or areas with fewer buyers often sell for less than those on the coast.
  • Year of manufacture is not filtered. Older examples of this model will generally be priced lower than newer ones.
  • Included equipment varies widely. A boat with a full suite of electronics, dodger, and new standing rigging may command a large premium.
  • Outliers are automatically excluded using statistical filtering to improve accuracy, but some bad data may remain.
Core Dimensions
LOA (Length Overall) 30.12 ft / 9.18 m
LWL (Waterline Length) 25.58 ft / 7.80 m
Beam 10.75 ft / 3.28 m
Max Draft 5.25 ft / 1.60 m
Displacement 10,100.00 lb / 4,581 kg
Ballast 3,800.00 lb / 1,724 kg
Sail Area (Reported) 436.00 ft² / 40.51 m²
Headroom 6.25 ft / 1.91 m
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer C. Raymond Hunt Associates
Builder O'Day Corp. (USA)
First Built 1985
Last Built 1988
Number Built 150
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Known Issues & What to Watch For

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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
 171
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
 14.98
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
 37.62
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
 269.38
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
 24.5
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
 1.99
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 6.78 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 1.81
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 982.55 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 14.99
Rig Dimensions
I (Foretriangle Height) 39.75 ft / 12.12 m
J (Foretriangle Base) 13.25 ft / 4.04 m
P (Mainsail Luff) 33.75 ft / 10.29 m
E (Mainsail Foot) 10.25 ft / 3.12 m
SA Fore 263.34 ft² / 24.47 m²
SA Main 172.97 ft² / 16.07 m²
SA Total (100%) 436.31 ft² / 40.53 m²
Est. Forestay Length 41.90 ft / 12.77 m
Mast Height (DWL) 44.00 ft / 13.41 m
Engine & Accommodations
Engine Make Universal
Engine Type Diesel
Horsepower 14
Fuel Capacity 26 gals / 98 L
Water Capacity 25 gals / 95 L
Find a Oday 31 For Sale
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