Fuel math that is right the first time.

Convert between kilograms, pounds, litres, and gallons at the real density. Plan fuel required with FAR and EASA reserves. Check tankering, receipts, and fuel weight. One aircraft profile fills in the rest.

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iPhone, iPad, and Android. No account. Nothing leaves your device.

Convert

Five units, live as you type.

Pick the fuel, pick the unit, type what is on board and what you want. FuelCalc shows the fuel to add in your unit and in the other four, using the density you actually have.

  • Density in use is always visible and always editable: the standard at 15 °C, the figure from the fuel slip, or the standard corrected for outside air temperature.
  • To tabs and full come straight from your aircraft profile.
  • History keeps recent conversions and plans. Tap a row to bring it back.
The Convert screen: fuel type chips for Avgas 100LL, mogas, Jet A, and Jet A-1; a unit picker for kg, lb, L, US gal, and Imp gal; the density in use shown as 0.720 kg/L, Avgas 100LL standard at 15 °C; current and target fields; and a result card with fuel to add in pounds plus kilograms, litres, US gallons, and imperial gallons.

Plan

Fuel required, line by line.

Enter burn rate, taxi and run-up, trip, alternate, reserve, and contingency. FuelCalc totals it, shows each line in weight and volume, and tells you how much to add from what is already on board.

  • Reserve presets for FAR 91.151 day and night, FAR 91.167, and EASA, one tap each.
  • On board now is shared with Convert, so it only needs typing once.
The Fuel required screen: fields for burn rate, taxi and run-up, trip, alternate, reserve, and contingency; reserve preset chips for FAR 91.151 day 30 minutes and night 45 minutes; an on board now field; and a breakdown list with each line in pounds.

Burn

Endurance and range, with the reserve held back.

Fuel on board, burn rate, and groundspeed give endurance in minutes and range in nautical miles. The reserve you set is subtracted and shown separately, so the usable number is the one you see.

  • Burn rate in any unit: gal/hr, lb/hr, L/hr, or kg/hr, converted at the density in use.
  • Fuel for a leg from time or distance, on the same screen.
The Endurance and range screen: a toggle between Endurance and range and Fuel for a leg; fields for fuel on board, groundspeed, and burn rate with a gal/hr, lb/hr, L/hr, kg/hr picker; a result card showing endurance in minutes, range in NM, and lb/hr in use; and a line showing a 45 minute reserve held back.

Tools

Three checks for the ramp.

  • Tankering. Price here, price there, fuel needed, and a carry penalty give a verdict and the amount saved, with a check that it fits in the tanks.
  • Receipt check. Ordered vs delivered vs gauge change, plus slip density vs standard, each flagged against a tolerance.
  • Fuel weight. Pounds and moment per tank, split by the profile's tank arms, ready for the weight and balance.
The More calculators screen listing Tankering, Receipt check, and Fuel weight under Calculators, and History and Settings under App.

Aircraft profiles

Set it up once. Every calculator pre-fills.

A profile holds registration, type, fuel type, default unit, tabs, typical burn, and each tank's usable fuel and arm. Switch aircraft from any screen and the converter, planner, and tools pick up the new numbers.

  • Any number of tanks, each with its own usable quantity and arm.
  • Several aircraft side by side, with one marked as the default.
The New aircraft form: registration and type fields, fuel type chips, a default unit picker, tabs and typical burn fields, and a tanks table with name, usable, and arm for left and right tanks plus an Add a tank link.

Every screen

Built for one-handed use on the ramp.

Big targets, high contrast, and the result card always within reach.

Convert screen
Convert
Fuel required screen
Plan
Endurance and range screen
Burn
More calculators screen
Tools
New aircraft screen
Aircraft

Why density matters

Weight to volume needs a density, and batches vary.

Converting kilograms or pounds to litres or gallons is only as good as the density you use. Jet fuel batches differ: ASTM D1655 allows 0.775 to 0.840 kg/L at 15 °C, a spread of about eight percent. FuelCalc shows the default in use and its reference condition, and lets you override it with the value on the fuel slip or correct it for outside air temperature.

Get FuelCalc

Free on the App Store and Google Play. Runs on iPhone, iPad, and Android phones and tablets.

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Privacy

FuelCalc stores everything on your device. No account, no analytics, no data leaves your phone.