30 to 1 Fuel Mix Calculator

30 to 1 Fuel Mix Calculator

US Gallons Liters UK Gallons (Imperial)

Mixing Instructions:

Based on a strict 30:1 (Gas to Oil) ratio.

function calculateFuelMix() { var gas = parseFloat(document.getElementById('gasAmount').value); var unit = document.getElementById('unitType').value; var resultDiv = document.getElementById('fuelResult'); var textOutput = document.getElementById('oilRequirementText'); if (isNaN(gas) || gas <= 0) { alert("Please enter a valid amount of gasoline."); return; } var ratio = 30; var oilNeeded; var outputUnit; if (unit === "gallons") { // 1 US Gallon = 128 Fluid Ounces oilNeeded = (gas / ratio) * 128; outputUnit = "Fluid Ounces (fl oz)"; } else if (unit === "liters") { // 1 Liter = 1000 Milliliters oilNeeded = (gas / ratio) * 1000; outputUnit = "Milliliters (ml)"; } else if (unit === "imperial") { // 1 UK Gallon = 160 Fluid Ounces oilNeeded = (gas / ratio) * 160; outputUnit = "Imperial Fluid Ounces (fl oz)"; } textOutput.innerHTML = "To get a 30:1 mix with " + gas + " " + unit + " of gasoline, add:" + oilNeeded.toFixed(2) + " " + outputUnit + " of 2-cycle oil."; resultDiv.style.display = "block"; }

How to Use the 30:1 Fuel Mix Calculator

Using the correct fuel-to-oil ratio is critical for the longevity of 2-stroke engines. A 30:1 ratio means that for every 30 parts of gasoline, you must add 1 part of two-cycle engine oil. This specific ratio is commonly required for older vintage outboard motors, certain chainsaws, and high-performance RC engines that demand more lubrication than modern 40:1 or 50:1 systems.

The 30:1 Math Explained

To calculate the amount of oil manually, you divide your total gasoline volume by 30. However, because we usually measure gas in gallons and oil in ounces, the conversion can get tricky.

• US Customary: (Gallons of Gas × 128) ÷ 30 = Ounces of Oil
• Metric: (Liters of Gas × 1000) ÷ 30 = Milliliters of Oil

30:1 Conversion Chart (Quick Reference)

Gasoline (US Gallons)	2-Cycle Oil (Fluid Ounces)
1 Gallon	4.27 fl oz
2 Gallons	8.53 fl oz
5 Gallons	21.33 fl oz

Steps for a Perfect Mix

1. Use a dedicated gas can: Never mix fuel directly in the equipment's fuel tank. It prevents proper blending.
2. Add half the gas: Pour about half of your gasoline into the clean container.
3. Add the oil: Use the calculator above to find the exact amount of oil and pour it in.
4. Add the remaining gas: This helps "wash" the oil down and starts the mixing process.
5. Agitate: Close the cap tightly and shake the container gently to ensure the oil and gas are fully integrated.

⚠️ Pro Tip: Fuel Freshness

2-stroke fuel mixtures degrade faster than straight gasoline. Only mix what you plan to use within 30 days. If you must store it longer, use a high-quality fuel stabilizer to prevent the ethanol from attracting moisture and gumming up your carburetor.