Back to Search
Dufour 31
Designer: Michel Dufour  ·  Builder: Dufour  ·  First built: 1973
+ Add to Compare
Videos
About the Dufour 31

Built from 1973 onwards by French manufacturer Dufour, this compact 31-footer represents classic European coastal cruising design with nearly 900 hulls launched over its production run. Designer Michel Dufour created a well-balanced yacht that prioritizes comfort and seaworthiness over pure performance, evident in its moderate sail area to displacement ratio of 14.04 and reassuring comfort ratio of 25.54. The fiberglass hull features a fin keel with rudder mounted on a skeg, providing predictable handling characteristics that many sailors appreciate for coastal and short offshore passages. With a waterline length of 23 feet generating a hull speed of 6.43 knots, this masthead sloop offers respectable sailing performance while maintaining the stability that comes with 9,600 pounds of displacement and 3,696 pounds of ballast. The Dufour 31's design philosophy emphasizes practical cruising over racing, making it well-suited for weekend coastal adventures and extended coastal cruising. Its capsize screening value of 1.98 suggests reasonable stability for offshore work, though most owners find it excels in protected waters and moderate coastal conditions. The combination of French styling, solid construction, and forgiving sailing characteristics has made this model a popular choice among sailors seeking an affordable entry into serious cruising.

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.
$14,250 – $28,000
typical asking price
Median $21,125  ·  4 listings used
All listings
$14,250 – $28,000 4
Rate a listing price
$
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) 30.83 ft / 9.40 m
LWL (Waterline Length) 23.00 ft / 7.01 m
Beam 10.50 ft / 3.20 m
Max Draft 5.67 ft / 1.73 m
Displacement 9,600.00 lb / 4,354 kg
Ballast 3,696.00 lb / 1,676 kg
Sail Area (Reported) 395.00 ft² / 36.70 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG
Designer Michel Dufour
Builder Dufour
First Built 1973
Number Built 900
Owner Reviews

No owner reviews yet — be the first to share your experience with this boat.

Known Issues & What to Watch For

No known issues documented for this model yet.

Own or have surveyed a Dufour 31? Submit a known issue

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
168
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
14.04
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
38.5
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
352.24
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
25.54
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
1.98
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. 6.43 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
1.2
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. 862.91 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. 14.03
Rig Dimensions
I (Foretriangle Height) 37.60 ft / 11.46 m
J (Foretriangle Base) 11.97 ft / 3.65 m
P (Mainsail Luff) 33.30 ft / 10.15 m
E (Mainsail Foot) 10.20 ft / 3.11 m
SA Fore 225.04 ft² / 20.91 m²
SA Main 169.83 ft² / 15.78 m²
SA Total (100%) 394.87 ft² / 36.68 m²
Est. Forestay Length 39.46 ft / 12.03 m
Engine & Accommodations
Engine Make Volvo
Engine Model MD7A/MD2B
Engine Type Diesel
Fuel Capacity 13 gals / 49 L
Water Capacity 20 gals / 76 L
How It Compares

vs. Dehler 31, Ericson 31 Independence, Hallberg Rassy 312, Monsun 31, Pearson 31 2

This boat Similar boats
Dimensions
LOA
Dufour 31 ★
30.8 ft
Dehler 31
30.8 ft
Ericson 31 Independence
30.9 ft
Hallberg Rassy 312
30.9 ft
Monsun 31
30.8 ft
Pearson 31 2
30.7 ft
LWL
Dufour 31 ★
23.0 ft
Dehler 31
24.3 ft
Ericson 31 Independence
23.9 ft
Hallberg Rassy 312
25.3 ft
Monsun 31
24.7 ft
Pearson 31 2
25.4 ft
Beam
Dufour 31 ★
10.5 ft
Dehler 31
10.2 ft
Ericson 31 Independence
10.4 ft
Hallberg Rassy 312
10.1 ft
Monsun 31
9.4 ft
Pearson 31 2
10.7 ft
Displacement
Dufour 31 ★
9 lbs
Dehler 31
7 lbs
Ericson 31 Independence
11 lbs
Hallberg Rassy 312
10 lbs
Monsun 31
9 lbs
Pearson 31 2
10 lbs
Ballast
Dufour 31 ★
3 lbs
Dehler 31
2 lbs
Ericson 31 Independence
4 lbs
Hallberg Rassy 312
4 lbs
Monsun 31
4 lbs
Pearson 31 2
3 lbs
Sail Area
Dufour 31 ★
395 sq ft
Dehler 31
443 sq ft
Ericson 31 Independence
Hallberg Rassy 312
484 sq ft
Monsun 31
414 sq ft
Pearson 31 2
493 sq ft
Performance
PHRF Rating (lower = faster)
Dufour 31 ★
168 s/nm
Dehler 31
162 s/nm
Ericson 31 Independence
Hallberg Rassy 312
Monsun 31
204 s/nm
Pearson 31 2
180 s/nm
SA / Displacement (higher = more powerful)
Dufour 31 ★
14.0
Dehler 31
19.3
Ericson 31 Independence
Hallberg Rassy 312
15.9
Monsun 31
15.1
Pearson 31 2
17.1
Ballast / Disp (higher = stiffer)
Dufour 31 ★
38.5 %
Dehler 31
Ericson 31 Independence
39.5 %
Hallberg Rassy 312
Monsun 31
45.4 %
Pearson 31 2
38.0 %
Comfort Ratio (higher = more comfortable offshore)
Dufour 31 ★
25.5
Dehler 31
18.9
Ericson 31 Independence
Hallberg Rassy 312
28.5
Monsun 31
27.2
Pearson 31 2
24.5
Capsize Screening (lower = safer)
Dufour 31 ★
1.98
Dehler 31
2.12
Ericson 31 Independence
Hallberg Rassy 312
1.83
Monsun 31
1.80
Pearson 31 2
1.98
Displacement / Length (lower = lighter)
Dufour 31 ★
352
Dehler 31
Ericson 31 Independence
371
Hallberg Rassy 312
Monsun 31
275
Pearson 31 2
271
Hull Speed
Dufour 31 ★
6.4 kts
Dehler 31
6.6 kts
Ericson 31 Independence
Hallberg Rassy 312
6.7 kts
Monsun 31
6.7 kts
Pearson 31 2
6.8 kts
Speed Number (higher = faster)
Dufour 31 ★
1.2
Dehler 31
2.7
Ericson 31 Independence
Hallberg Rassy 312
1.6
Monsun 31
1.8
Pearson 31 2
2.0
Find a Dufour 31 For Sale