Backpacking Stove Fuel Calculator
Enter your trip length, daily hot-water need, measured stove fuel use, and any usable fuel already on hand. The calculator estimates the fuel to plan for, how many new canisters to add, and how much fuel should be left after the trip.
New canisters to add1
- Total hot water
- 3
- Equivalent 0.5 L heating cycles
- 6
- Baseline fuel use
- 42
- Fuel to plan for
- 60.48
- Does existing fuel cover the trip?
- No, 60.5 g more needed
- Fuel packed after adding canisters
- 110
- Estimated fuel left after the trip
- 49.52
Fuel amounts are net fuel contents in grams, not full canister weight.
Field allowance and safety reserve are compounded and calculated before the canister count is rounded up.
How to use this calculator
- Count the days on which the stove will be used.
- Enter the group hot-water volume for meals, drinks, cleanup, and other stove use.
- Enter your measured grams of fuel used to heat 0.5 liters with the stove and pot you will carry.
- Add allowances for field conditions and reserve, then enter any usable fuel in compatible partial canisters.
- Choose the new canister size you would buy and read the canister count and leftover fuel.
How the stove fuel estimate is calculated
The calculator starts with hot water because most backpacking stove planning comes down to how many half-liter boils, hot drinks, and meal rehydrations the group expects. A real stove test matters more than a generic boil-time claim. Weigh the canister, heat 0.5 liters in the pot you will carry, then weigh it again. The difference is the fuel-per-half-liter input.
The formula uses these values:
- D is trip length in stove-use days.
- W is group hot-water liters per day.
- F is grams of fuel used per 0.5 liters.
- E is the cold and wind allowance percent.
- R is the safety reserve percent.
- H is usable fuel already on hand in grams.
- C is the selected new-canister fuel capacity in grams.
Total hot water is V = D × W. Equivalent half-liter heating cycles are B = V ÷ 0.5. Baseline fuel is G0 = B × F. Planned fuel compounds the allowances: G = G0 × (1 + E ÷ 100) × (1 + R ÷ 100). Additional fuel needed is A = max(0, G − H). New canisters are N = 0 when A = 0; otherwise N = ceil(A ÷ C). Packed fuel is P = H + N × C, and estimated leftover fuel is S = P − G.
What moves the answer most
Daily hot-water volume and measured fuel use drive the baseline. A group that boils water for breakfast, dinner, and several drinks will need much more fuel than a solo hiker who only rehydrates one meal. The cold and wind allowance can be just as important because cold water, gusty cooking, snow melting, and long simmering all use more fuel than a sheltered home test.
The canister count changes in whole steps. A small shortfall still means one more canister because fuel canisters are not bought fractionally. Existing partial canisters can reduce or eliminate the new-canister count, but only count fuel that is compatible with the stove and realistically usable.
What this calculator leaves out
This is a fuel-content planner, not a complete pack-weight calculator. It does not include the metal canister weight, stove weight, pot efficiency differences beyond your measured test, the fuel cost, or whether a specific canister will perform well in cold conditions. It also does not decide whether a windscreen is safe with your stove. Follow the stove manufacturer's instructions, especially for upright canister stoves where enclosed windscreens can overheat the canister.
Worked example
Suppose a three-day trip needs 1 liter of hot water per day, and your stove uses 7 g of fuel to heat 0.5 liters. Total hot water is 3 × 1 = 3 liters, or 3 ÷ 0.5 = 6 half-liter heating cycles. Baseline fuel is 6 × 7 = 42 g.
With a 20% cold-and-wind allowance and a 20% safety reserve, planned fuel is 42 × 1.20 × 1.20 = 60.48 g. With no usable fuel on hand and 110 g canisters, the shortfall is 60.48 g, so the calculator rounds up to 1 new canister. Packed fuel is 110 g, leaving about 49.5 g after the trip if conditions match the estimate.
Common questions
How much canister fuel does a backpacking stove use per day?
There is no single daily number because stove efficiency, water volume, wind, water temperature, and simmering time vary. A common boil-only trip may use only a few dozen grams per day for a small group, while cold or windy cooking can use far more. A weighed test with your stove and pot gives a better starting point than a generic estimate.
How do I measure grams of fuel used per boil?
Weigh the canister before cooking, heat 0.5 liters of water the same way you normally would, then weigh the canister again. The difference in grams is the fuel used per 0.5 liters. Repeat the test a few times if you want a steadier average.
How much extra fuel should I carry for wind and cold?
Use the field allowance for expected efficiency losses and the safety reserve for unplanned needs. Mild summer trips with sheltered cooking may need a modest allowance, while cold water, exposed camps, altitude, or simmered meals justify more. The calculator compounds the two percentages so the reserve also covers the field-adjusted fuel.
How can I find the fuel remaining in a partial canister?
Weigh the canister and subtract the empty canister tare weight, not the labeled fuel capacity. Some canisters print the gross and net weights, and some brands publish tare weights by size. If you do not know the tare weight, be conservative or use that partial canister only as extra reserve.
Is one 110-gram canister enough for a weekend trip?
Often yes for one or two people using a stove mostly to boil water, but it depends on your measured fuel use and total hot-water volume. For example, the default three-day case plans for 60.48 g before canister rounding, so one 110 g canister has a wide surplus. More people, colder water, wind, or simmered meals can change that quickly.
Are windscreens safe with upright canister stoves?
Not always. A tight or full windscreen can trap heat around an upright canister and may create a dangerous overheat condition. Use only wind protection allowed by the stove manufacturer, and follow the stove manual rather than assuming a generic windscreen is safe.