Calculator Form
Use one mode at a time. Enter values, choose units, submit, then review the result, export files, and inspect the plotted premix relationship.
How to Use This Calculator
- Select a calculation mode based on the value you already know.
- Choose a common ratio or enter a custom ratio.
- Enter fuel, oil, or total premix amount in the matching field.
- Pick output units for fuel, oil, and total mixture.
- Set decimal places, then submit the form.
- Review the result table, comparison table, and graph.
- Download the generated CSV or PDF if needed.
- Cross-check the final ratio with your engine manual before mixing.
Formula Used
This calculator applies standard premix ratio mathematics. A ratio written as 50:1 means fifty parts fuel for one part oil.
Oil = Fuel / RatioFuel = Oil × RatioTotal Premix = Fuel + OilFuel from Total = Total × Ratio / (Ratio + 1)Oil from Total = Total / (Ratio + 1)Actual Ratio = Fuel / OilOil Percentage = Oil / Total × 100
All calculations are performed after converting entered values into milliliters, then converted back to the selected display units.
Example Data Table
| Fuel Amount | Ratio | Oil Needed | Total Premix |
|---|---|---|---|
| 1.00 L | 25:1 | 40.00 mL | 1.04 L |
| 2.00 L | 32:1 | 62.50 mL | 2.06 L |
| 5.00 L | 40:1 | 125.00 mL | 5.13 L |
| 1.00 US gal | 50:1 | 2.56 US fl oz | 1.02 US gal |
FAQs
1. What does a 50:1 mix mean?
It means fifty equal parts fuel are mixed with one equal part oil. The calculator divides fuel by fifty to find the required oil amount.
2. Can I calculate from oil instead of fuel?
Yes. Choose the oil-to-fuel mode, enter the oil amount, select the ratio, and the calculator returns the supported fuel quantity and total premix.
3. Can this page split a total premix volume?
Yes. The total-premix mode separates a known final mixture into its fuel portion and oil portion using the selected ratio.
4. Why are unit conversions included?
Premix instructions appear in liters, milliliters, gallons, and fluid ounces. Conversions help keep the math consistent while matching the container you use.
5. Does the actual ratio finder help with checking old mixes?
Yes. Enter known fuel and oil amounts, and the calculator estimates the effective ratio so you can compare it with a target preset.
6. What is oil percentage in the results?
Oil percentage shows how much of the final premix is oil by volume. It offers a quick mathematical check beyond the usual ratio label.
7. Should I always trust the nearest preset shown?
No. The nearest preset is only a comparison aid. Always follow the engine manufacturer’s recommended ratio, especially for tuned or older equipment.
8. Why export results to CSV or PDF?
Exports help you save a mixing record, share values with others, or keep a printable reference near your tools, workshop, or maintenance notes.