Ethanol Content Estimator

Graduated Test Tube Method

Ethanol % = ((Separation Mark - Water Added) ÷ Fuel Sample) × 100

Input the exact values read directly from your graduated ethanol test bottle/cylinder. The tool automatically isolates the added water to find the true fuel percentage.

Initial Water Added (ml):

Settled Separation Mark (ml):

Total Mixture Volume (ml):

Scratchpad / Quick Notes

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Perform a calculation and click "Log Current Run" to save it for side-by-side comparison.

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Quick-Swap Unit Converter

Value:

Unit:

Step-by-Step Cold Test Procedure

Using a graduated test tube, add water up to the first marked line (e.g. 10 ml).
Add your fuel sample up to the top marked line (e.g. 100 ml total).
Shake the mixture vigorously for 10-15 seconds.
Let it settle on a flat surface for 1-2 minutes until phase separation is complete.
Read the volume of the water-ethanol separation line. Calculate using the tool above!