Johnson 18 Performance

Hull Speed

The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.

5.2 kts

A displacement hull pushes a bow wave whose speed is limited by the waterline length.

Performance Ratios

Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.

Displacement / Length

60

Ultralight — responsive and fast, but carries less stores.

Comfort Ratio

3.7

Quick, snappy motion — better for day sails and racing than long passages.

Hull Speed

5.2kts

Pounds/Inch Immersion

2lbs

Weight needed to sink the hull one inch — loading sensitivity.

Motion & Offshore Suitability

Two ratios that matter most when you're planning passages — how the boat feels in a seaway, and whether the hull geometry is suitable for open ocean.

Comfort Ratio

3.7

Quick, snappy motion — better for day sails and racing than long passages.

Under 20 — Snappy, racing motion

20–30 — Acceptable coastal

30–40 — Good offshore comfort

Over 40 — Very comfortable offshore

PHRF Fleet Position

Where the Johnson 18 sits on the PHRF handicap spectrum — lower numbers mean faster boats.

Cruiser 150–210

Heavy Cruiser 210–300

Hunter 18 282s/nm

Catalina 18 289s/nm

How It Compares

Side-by-side with the boats most often cross-shopped against the Johnson 18.

	Johnson 18	Buccaneer 18	Capri 18 Catalina	Catalina 18	Hunter 18	Laguna 18
Dimensions
LOA	18.0	18.0	18.0	18.0	18.0	18.0
LWL	—	16.7	16.3	15.8	15.5	14.7
Beam	6.6	6.0	7.6	7.8	7.5	8.0
Displacement	480	500	1	1	1	1
Ballast	—	—	425	500	500	500
Sail Area	185	175	155	152	145	151
Performance
PHRF	—	—	—	289	282	—
SA/Disp	—	44.5	19.0	19.9	18.5	18.5
Bal/Disp	—	—	28.3	37.0	35.7	—
Comfort	3.7	4.2	9.3	8.2	9.0	9.3
Capsize	—	3.03	2.65	2.81	2.68	2.80
Hull Speed	5.2	5.5	5.4	5.3	5.3	5.1