J Boats · 43 ft · masthead sloop
J/40 sails
Every sail for the J/40 on one page. Fixed prices on cruising sails you can buy today, instant estimates on racing sails, and the upgrades that matter offshore. All sized to the J/40 rig.
Luff (P) 16.18 mFoot (E) 5.62 mFore triangle (I) 16.79 mBase (J) 4.72 mLength 13.11 m
CruiseBuy cruising sailsMainsail and furling genoa in Dimension-Polyant Dacron, fixed price, built in about 4 weeks.From A$5,286See cruising sailsRaceBuild a racing wardrobeMain, J1 to J3, code zero and kites in film or membrane. Instant estimate, full quote in 3 days.Main from A$9,004Open the configuratorAdventureGo offshoreHydranet for long passages, heavier cloth, a third reef and storm sails sized to this rig.Storm jib from A$461Plan a passage wardrobe
Cruising sails
Fixed price. Add to cart.
Made to measure for the J/40 in named Dimension-Polyant cloth. Pick the cloth and options, check out, and we confirm your measurements before anything is cut.
Furling genoa
Size (LP)
120% recommended from the rated headsail on 4 ORC certificates.
UV cover colour
A$5,731A$ including GST
Main and 120% genoa together: A$12,826 in Dimension-Polyant Optimum Cruise. Add both to the cart and they ship together.
Build timeStandard about 4 weeks. Express about 2 weeks (+8%), economy about 8 weeks (5.5% off).
Sail numbersOptional, 460 mm letters for this boat, priced per character when you order.
Fit checkWe send a short measurement check after you order and confirm before cutting.
12-month warrantyOn top of your rights under Australian Consumer Law. Shipped worldwide.
Also sized to your rig
Asymmetric spinnakerSize 8, 94 m², 14.6 m luff. Cruising nylon in 11 colours.A$2,902Dousing sockSized to the spinnaker luff. Pick your tube colours.Added with the spinnakerStorm jibUp to 14.1 m² with a luff up to 10.9 m. High visibility orange.From A$461TrysailUp to 15.9 m². Slides, slugs or grommets to suit your track.From A$740
Who's making your sail
Real sailors.
A real loft in Geelong.
Every Kraken sail is designed from your boat’s own measurements by a designer who still races at international level, and built in cloth made in Europe or America. Before anything is cut, Christie or Ryan checks your numbers and talks to you about how you sail your J/40. That conversation is where a good sail becomes the right one.
Questions about the J/40? Email sales@krakensails.com and you’ll hear back from one of us, not a call centre. Read our story
Rudder Cup 2026
Toecutter, on Kraken sails, wins AMS and PHS in Australia’s oldest ocean race.
Sailing with Phoenix
Oregon to Hawaii singlehanded. On day 11 the rudder went and the sails flogged for four hours in 25 knots. “The sails held.” Read the story
Racing sails
Open the J/40 configuratorBuild a Racing Wardrobe
Instant estimate, full quote in 3 business days. Sized from the rated sail areas of real J/40s. Configure the wardrobe and see the estimate straight away. A sailmaker then sends your full quote and sail plan.
| Sail | PX film | Carbon Sport | Membrane |
|---|---|---|---|
| Mainsail43.4 m², pin head | A$9,004 | A$11,281 | A$11,809 |
| J1Light air genoa | A$5,924 | A$7,552 | A$8,190 |
| J3Heavy air jib | A$4,763 | A$6,045 | A$6,787 |
| Code zeroDimension-Polyant CZ | A$7,695 | ||
| A2 / A3165.5 / 140.7 m² | A$8,223 | A$11,957 |
From prices, inshore cloth, one reef on the main. Kites in Nylite; the A2 in Superkote is shown in the Carbon Sport column. A$ including GST.
- 1Choose inshore or offshore and your cloth.
- 2Add the sails you need and see the estimate.
- 3Get sent your quote and sail plan.
Racing sails are quoted, not bought online, so a sailmaker checks the rig and your racing before anything is built. Two-year warranty on racing sails.
J/40 racing sail prices
Typical prices for the J/40, sized from the rated sail areas of real boats. Your exact price follows the rig check.
Inshore racing
| Sail | Value · PX Liteskin | Performance · Carbon Sport film | Grand Prix · Membrane, film faces |
|---|---|---|---|
| Mainsail | A$9,004 / US$5,290 | A$11,281 / US$6,620 | A$11,809 / US$6,945 |
| J1 headsail | A$5,924 / US$3,485 | A$7,552 / US$4,440 | A$8,190 / US$4,825 |
| J2 headsail | A$5,660 / US$3,335 | A$7,211 / US$4,240 | A$7,876 / US$4,645 |
| J3 headsail | A$4,763 / US$2,805 | A$6,045 / US$3,560 | A$6,787 / US$4,005 |
Coastal & offshore racing
| Sail | Value · PX taffeta | Performance · Carbon Sport Liteskin | Grand Prix · Membrane, non-woven faces |
|---|---|---|---|
| Mainsail | A$9,158 / US$5,380 | A$15,274 / US$8,955 | A$13,772 / US$8,095 |
| J1 headsail | A$5,610 / US$3,305 | A$9,719 / US$5,710 | A$8,982 / US$5,290 |
| J2 headsail | A$5,368 / US$3,160 | A$9,279 / US$5,450 | A$8,630 / US$5,085 |
| J3 headsail | A$4,516 / US$2,665 | A$7,755 / US$4,560 | A$7,414 / US$4,370 |
Downwind and reaching
| Sail | Cloth | Typical price |
|---|---|---|
| A2 asymmetric (166 m²) | Nylite | A$8,223 / US$4,830 |
| A2 asymmetric (166 m²) | Superkote | A$11,957 / US$7,020 |
| A3 asymmetric (141 m²) | Nylite | A$7,134 / US$4,195 |
| A3 asymmetric (141 m²) | Superkote | A$10,307 / US$6,050 |
| Code zero | CZ | A$7,695 / US$4,520 |
| Code zero | CZ GP | A$10,483 / US$6,155 |
A$ prices include GST. As a proudly Australian company we keep our tax here, and Australian businesses paying their tax help support Australian sport. US$ prices are before local taxes and duties.
Adventure and offshore
Plan a passage wardrobeSails for the long way round.
Passage making asks more of a sail: weeks on the boom, sun and chafe, and a third reef when it blows. Here is how the J/40 wardrobe changes when you leave the coast.
Coastal and weekend
Optimum Cruise
Dimension-Polyant's cruising Dacron and our best value.
- Mainsail
- A$7,095
- Genoa 130%
- A$6,177
Works hard, holds shape
C-Breeze
Tighter weave of higher tenacity fibres. Resists stretch and lasts longer.
- Mainsail
- A$9,141
- Genoa 130%
- A$7,838
Bluewater and expedition
Hydranet Radial
Dimension-Polyant's offshore cloth, woven with Dyneema, with panels that follow the loads. Built for ocean miles.
- Mainsail
- A$18,260
- Genoa 130%
- A$15,714
Third reef and offshore buildThird reef, heavier patches and chafe protection. Added in your passage quote.Quoted with your wardrobeStorm jib and trysailSized to this rig under the offshore safety rules: jib to 14.1 m², trysail to 15.9 m².From A$461Passage storiesOregon to Hawaii single-handed, a Tahiti delivery, Melbourne to Osaka.Read the case studies
Hydranet and offshore builds go through a short quote so we can talk through your passage. Catalogue sails carry a 12-month warranty; custom and racing sails carry two years.
A real loft in GeelongSails designed by Kraken sailmakers who race and cross oceans themselves.
Named cloth onlyEvery price names the exact Dimension-Polyant cloth and weight.
Australian Consumer LawWarranty on top of your consumer rights, from an Australian company.
Delivered anywhereExpress to Australia, the US and worldwide, with US import duty prepaid.
Rig and sizes
J/40 rig
These are the published rig dimensions. Boats change over the years, so we check your own measurements before we build, and tell you before design starts if a change moves the price.
| Mainsail luff (P) | 16.18 m |
|---|---|
| Mainsail foot (E) | 5.62 m |
| Fore triangle height (I) | 16.79 m |
| Fore triangle base (J) | 4.72 m |
| Mainsail area | about 53.2 m² |
| Genoa 130% area | about 51.5 m² |
| Length overall | 13.11 m |
| Rig | Masthead sloop |
Questions about J/40 sails
How much is a new mainsail for a J/40?
From A$6,881 (US$3,950 in the US) in Dimension-Polyant Optimum Cruise with a full head batten and three leech battens, or A$7,095 with four full battens. C-Breeze costs more. Racing mainsails start from A$9,004 in PX film.
What size genoa does a J/40 need?
J/40s racing under ORC carry a headsail of about 43.0 m², about 121% LP on this rig (median of 4 certificates). So a 120% furling genoa (about 47.5 m² on this boat) matches the sail plan. Go one size smaller for windy places or easier tacking, or bigger for light air. A 120% genoa in Optimum Cruise is A$5,731 (US$3,295 in the US).
Can I race in cruising sails?
Yes, plenty of club racers do. If results matter, a laminate main and headsails hold their shape far longer: open the configurator to compare.
How long does it take?
Cruising sails take about 4 weeks to build, then ship express. Racing laminates take about 4 weeks and membranes about 6 once the design is signed off.
Do the prices include GST and shipping?
A$ prices include GST. US$ prices are before local taxes and duties. Shipping is added at checkout: A$75 in Australia, about US$75 plus duty prepaid to the US.
A$ prices include GST. As a proudly Australian company we keep our tax here, and Australian businesses paying their tax help support Australian sport. US$ prices are before local taxes and duties.