Ferry footprint calculator
See how the carbon footprint of sailing compares with flying or driving the same journey — per person.
Portsmouth → Bilbao
≈ 850 km, straight lineFerry (foot passenger)16.1 kg
Short-haul flight130.9 kg
Car97.5 kg
Per person with 2 occupants, driving ~35% further than the straight line.
Taking the ferry emits about 88% less CO₂ per person than flying this route.
Figures are indicative, based on average emission factors (≈19 g CO₂e per passenger-km for ferry, ≈154 g for short-haul flying, ≈170 g per km for a petrol car). Actual emissions vary by vessel, aircraft, load and driving style.