Food & Water Calculators
Calorie needs, water requirements, meal planning, fuel canister estimates and cooking calculations.
Calorie Calculator
Calculate daily calorie needs based on activity level, terrain and pack weight.
Water Requirement Calculator
Estimate water needs per day based on temperature, exertion and altitude.
Meal Planning Calculator
Plan meals for your trip with calorie targets, weight budgets and shopping lists.
Fuel Canister Calculator
Calculate how many fuel canisters you need based on meals, boil times and altitude.
Stove Burn Time Calculator
Estimate how long your stove fuel will last based on canister size and burn rate.
Food Weight Calculator
Calculate the total weight of food for your trip based on calories per gram.
Dehydrated Food Calculator
Calculate water needed to rehydrate meals and total food weight savings.
Water Purification Calculator
Calculate purification tablet or filter capacity needs for your trip duration.
Cooking Time Calculator
Adjust cooking times for altitude, temperature and stove type.
Bear Canister Calculator
Calculate the right bear canister size based on trip length and food volume.
10 free calculators in Food & Water
Fuelling Your Outdoor Adventures
Proper nutrition and hydration are critical for outdoor performance and safety. A day of strenuous hiking with a loaded pack can burn 3,000 to 5,000 calories, far more than a typical day at home. Running out of food or water in remote areas is a serious safety risk.
Water requirements increase significantly with exercise, heat and altitude. The general guideline is 2-4 litres per day for moderate hiking, but this can double in hot weather or at high altitude. Water weighs 1kg per litre, so carrying too much adds significant pack weight.
Gas canister stoves are the most popular choice for UK backpacking. A standard 230g canister provides roughly 35-45 minutes of burn time, enough for approximately 12-15 boils of 500ml of water. Our fuel canister calculator helps you work out exactly how much fuel to carry.