Fuel weight
Fuel weight from volume, or volume from weight, for avgas or jet fuel at a nominal density or one you enter.
Planning and education aid. Not for primary navigation. Full disclaimer
Experimental: not yet fully verified. How results are checked
40 US gal of fuel weighs 240 lb. This uses a nominal density.
- Uses the nominal 100LL avgas density of 6 lb/gal (FAA-H-8083-1B). Actual fuel varies with temperature; use your fuel's measured density for close loading.
- gal was read as US gallons, not imperial gallons.
- Fuel volume
- Density used
- Density basis
Provenance
- Computed by
- aviation.loading.fuel-weight 1.0.0, core 0.1.0
- Model
- Weight = volume × density
- Accuracy
- Exact for the density used. Real fuel density varies with temperature and batch by a few percent.
- Notes
- 3 shown with the answer
- Cites
- Federal Aviation Administration, Aircraft Weight and Balance Handbook, FAA-H-8083-1B
Something look off?
How we got thisFormula, worked example, sources, and proof
Model: Weight = volume × density
Accuracy: Exact for the density used. Real fuel density varies with temperature and batch by a few percent.
Worked example: 40 US gal of 100LL. Source: add-aviation-suite fuel scenario: 240 lb at the nominal 6.0 lb/gal (FAA-H-8083-1B chapter 2). It is golden test vector v001, and every build checks the tool still gives its answer within its tolerance.
You enter
- Fuel type
- 100ll
- Fuel volume
- 40 gal
You get
- Fuel weight
- 240 lb
- Fuel volume
- 40 US gal
- Density used
- 6 lb/US gal
- Density basis
- nominal
Review: Not yet independently reviewed by a flight instructor (CFI).
Last verified: 2026-09-18, when a maintainer last confirmed this tool's sources at the issuer. See the sources ledger.
Status: version 1.0.0, core 0.1.0. See this tool in the verification report.
Checked against: 5 golden test vectors (download the test vectors, each with its source and tolerance). See how results are checked and every source.
Sources
- Aircraft Weight and Balance Handbook, FAA-H-8083-1B, Federal Aviation Administration, FAA-H-8083-1B. Chapter 2 (weight and balance theory, fuel weights) and Chapter 4 (CG envelope, percent MAC).
Experimental means this tool has not yet met the stable bar: at least 20 golden vectors, differential tests, and an independent worked example.