The five buckets
Fuel is the easy one — distance, consumption, price. Lodging is the biggest variable in mid-range trips. Food is roughly half lodging for restaurant-driven travellers, much less for self-cooked. Tolls and ferries are localised but can be substantial — the Confederation Bridge alone is over $50 each way, and a BC Ferries crossing with a vehicle can run $80–150. Miscellaneous catches park passes, attractions, gear, gas-station snacks and the inevitable thing you forgot to pack.
Per-person vs per-vehicle costs
Fuel and tolls scale with the vehicle, not with people. Lodging partially scales (a hotel room is the same price for one or two adults; many places charge extra for a third or fourth). Food scales fully per person. The calculator splits the total across travellers for a per-head figure — useful for couples settling up after the trip or for friends carpooling.
Where the budget usually overruns
- Fuel — winter trips and roof-box use can blow the budget by 20–30%. Increase your consumption assumption when packing the rooftop carrier.
- Restaurants — three sit-down meals a day add up faster than expected. Self-pack breakfast and one other meal (cooler, hotel kettle, picnic supplies) and you save $30–60 per person per day.
- Single-night hotels — last-minute bookings on popular routes (Trans-Canada, Banff–Jasper, Cabot Trail) double during peak season. Book 2–4 weeks ahead in summer.
- Activity tickets — Banff/Jasper park passes, Niagara, West Edmonton Mall, ski hills. A family of four at a Rocky Mountains attraction can be $200+ for a single afternoon.