The honest answer most people will not give you is that a fortnight in France can cost 600 euros or 3,500 euros for the same boat, the same crew and the same number of nights. The difference is not luck. It is a string of small decisions made before you slip the lines.
I have done this run more than once on a 12-metre sloop, two adults aboard, and I keep a tatty notebook with the actual numbers. What follows is a real two-week budget, broken down so you can see exactly where the money goes and which lines you can cut without ruining the trip.
The five lines that decide everything
Strip away the romance and a cruising budget is five buckets: berths, fuel, food, harbour and admin dues, and the unplanned stuff. Get the first three roughly right and the total comes within a few hundred euros of itself.
Here is my baseline fortnight, mid-season, Atlantic coast, sailing most days and using the engine only for entering and leaving port.
- Berths: 9 marina nights, 5 nights at anchor or on a free mooring
- Diesel: about 90 litres across the two weeks
- Food: cooking aboard most nights, eating ashore three times
- Dues: tourist tax, the odd lock, water and laundry
- Contingency: one breakage, one weather-bound extra night
Berths: the biggest single number
Marina nights are where a budget lives or dies. On the Atlantic and Channel coasts a 12-metre boat pays roughly 25 to 52 euros a night in season, with water, electricity and showers usually thrown in. La Rochelle, which publishes a clear tariff, sits around 42 to 52 euros a night for an 11 to 12 metre boat in high season. Smaller Brittany and Charente ports run 25 to 40.
Nine marina nights at an average of 38 euros comes to 342 euros. Add the five nights I spent at anchor or on a town mooring, which cost nothing or a token few euros, and the sleeping bill for a fortnight is around 360 euros.
Now look at the same fortnight on the Riviera. A 10-metre boat in Saint-Tropez pays from 80 euros at the cheaper Jean Lescudier basin to over 171 euros a night in the Old Port. Nine nights there could be 1,000 euros on its own. The coast you choose matters more than anything else you decide, which is why I dug into the regional gaps in annual running costs of a boat in France.
Fuel: smaller than you fear, if you sail
People wildly overestimate diesel. A sailing boat that actually sails burns far less than the gloomy forecasts suggest. Marina diesel in France in May 2026 ran about 2.12 euros a litre on the road network and a touch higher at the fuel berth, with Ajaccio quoting 2.31 euros a litre.
Across two weeks I used roughly 90 litres: motoring out of harbours, charging the batteries, a couple of windless afternoons. At 2.20 euros that is 198 euros. A motorboat doing the same passages would multiply that by five or six, which is its own conversation in fuel costs for motorboat cruising in France.
Fill the tank before you leave home waters if your diesel is cheaper there, top up little and often, and the fuel line stays modest.
Food: the line you actually control
This is where the savings hide. Eat ashore every night and two people will spend 50 to 70 euros per dinner before wine, because a French plat du jour sits around 15 euros a head and a proper three-course menu du jour runs 16 to 28 euros. Fourteen dinners ashore for two is easily 800 euros.
Cook aboard instead. A weekly supermarket shop for a couple in France lands between 75 and 110 euros, so two weeks of provisioning is around 200 euros. Buy at the morning market, hit Lidl for the staples, and you eat better than the tourists paying restaurant mark-ups.
My compromise: provision properly, then eat ashore three times across the fortnight as a treat. That is roughly 200 euros of shopping plus 180 euros of restaurant meals, so 380 euros total. The full restaurant route would have cost twice that. There is more on squeezing this line in money-saving cruising in France.
Dues, admin and the small stuff
The forgettable items add up. Tourist tax (taxe de sejour) on a 12-metre boat is charged per notional occupant; the Riviera caps it near 6.43 euros per person per night, so two crew can owe over 12 euros a night in the smart ports, though most Atlantic harbours charge a fraction of that. Budget 40 euros for tax across the fortnight on a modest coast.
Add laundry (around 8 euros a wash-and-dry), the occasional pump-out, a gas bottle swap, and a couple of euros here and there for fresh water at a metered tap. Call it 80 euros all in.
The contingency line you must not skip
The fortnights that hurt are the ones with no slack in the budget. Boats break. Weather pins you in port for an extra day you did not plan to pay for. An impeller goes, a fender bursts, a shackle pins itself somewhere unreachable and you buy two more from a chandler at tourist prices.
I carry a contingency of around 150 euros for a fortnight and treat it as spent. Some trips it sits untouched and rolls into a celebratory dinner on the last night. Most trips something small eats half of it. The mistake is budgeting to the last euro and then panicking when a 90-euro weather-bound marina night lands on day ten. Build the slack in and the trip stops feeling fragile.
How the seasons move the number
Timing changes the whole picture. Almost every French marina outside the Med halves its rate outside high season, which runs May to September. Cruise the same fortnight in late September instead of August and the berthing line can drop by 40 percent, with warmer water than people expect and a quarter of the boats sharing the anchorage.
I have paid under 25 euros a night in late September in ports that wanted 45 in August. If your calendar bends at all, the shoulder months are the single cheapest decision after choosing the coast. The August fortnight is the dearest two weeks of the French year, and you pay for the privilege of sharing it with everyone else.
The two-week total
Here is the fortnight as I actually ran it on the Atlantic coast:
- Berths: 360 euros
- Diesel: 198 euros
- Food (provisions plus 3 meals ashore): 380 euros
- Dues, laundry, gas: 120 euros
- Contingency (one weather day, one minor repair): 150 euros
That comes to 1,208 euros for two people over fourteen days, or about 86 euros a day for the boat. Strip out the restaurant meals and anchor more, and you slide under 1,000. Run the identical trip on the Riviera in August, staying in marinas every night, and you can clear 3,000 without trying.
Where the same trip goes wrong
The fortnights that blow the budget share a pattern. They book marinas every single night, never anchor, eat ashore by default, and pick the most expensive fortnight of the year on the most expensive coast. Each of those is a choice.
The cheapest credible fortnight I have done, anchoring most nights, cooking aboard, sailing a flexible route in late September, came in under 600 euros for two. The trade-off was fewer hot showers and more time on the anchor windlass. I would happily do it again.
If you are weighing where those marina nights bite hardest, the regional breakdowns in the cost of a Brittany cruising summer and the cost of a Cote d'Azur cruising summer show how far the same fortnight stretches on each coast. The boat does not change. The bill does.
