France Jet Lag Calculator

France keeps a single reference offset of UTC+1 across Paris, so the mental math never changes mid-trip. Jet lag into Paris scales with one number: |home offset − 1|.

Context for the adjustment: Paris rests at 35 m above sea level, and France's position in Western Europe shapes both flight routing and how much daylight you meet on arrival. Reference frame for France: Paris keeps UTC+1 and sits 35 m above sea level in Western Europe, with daylight saving nudging summer clocks an hour.

Direction changes the bill: flying to France eastward from London costs about 1 days of recovery. The westward routing to Paris costs only 0.7 — the body clock delays to France more easily than it advances. Sip an extra 500 ml of water for every 3 hours in the air to Paris; cabin air on the 1-hour France run is drier than most deserts.

Before you fly to France: move bedtime and meal times 30–60 minutes per day toward Paris time for 3–4 days. In the air on the France route (arrival UTC+1), hydrate hard and skip alcohol. Sleep only when it is night in Paris, so the cabin previews France hours.

Applied to this Western Europe trip: 1 hours east from London to Paris maps to about 1 reset days, so a France itinerary should front-load outdoor time on days one to 1.

Near-4am wakings are part of night one in Paris (35 m, UTC+1); stay dark and still, skip the clock-checking, and France nights settle by the third. Naps are a tool with a limit in France: 20–30 minutes, done by 3pm Paris time, never as a substitute for a full local night. For shifts over six hours — into France, that means the 1-hour London gap — 0.5–3 mg of melatonin at Paris bedtime (UTC+1) pulls the clock faster in 3–4 nights.

Clear France dosing with a clinician first. Practical baseline: lights out in a dark 16–20°C Paris room (35 m, UTC+1), and no evening alcohol for the first two nights while the France clock settles.