50 to 1 fuel mix calculator

A 50 to 1 fuel mix refers to the ratio of gasoline to two-stroke engine oil. This means for every 50 parts of gasoline, you add 1 part of oil. This specific ratio is commonly used in many two-stroke engines, such as those found in chainsaws, string trimmers, leaf blowers, and some outboard motors. Using the correct fuel mix is crucial for the longevity and performance of your engine, as too much or too little oil can lead to serious damage.

Why is the Correct Fuel Mix Important?

Two-stroke engines rely on the oil mixed with the fuel for lubrication. Unlike four-stroke engines, which have a separate oil crankcase, two-stroke engines burn the oil along with the gasoline.

• Too little oil: Can lead to insufficient lubrication, causing excessive friction, overheating, and premature wear of engine components like the piston, cylinder, and crankshaft. This can result in costly engine seizure.
• Too much oil: Can cause excessive smoke, fouled spark plugs, carbon buildup on engine parts, and reduced engine performance. It can also lead to a “rich” fuel mixture, making the engine run less efficiently.

Always consult your equipment’s owner’s manual for the manufacturer’s recommended fuel mix ratio. While 50 to 1 is common, some engines may require different ratios like 40 to 1 or 32 to 1.

How to Calculate a 50 to 1 Fuel Mix

Calculating the correct amount of oil for your gasoline can be done with a simple formula.

Formula:

Oil Required = (Gasoline Volume / 50)

Let’s look at some common examples:

For 1 gallon of gasoline:

• 1 gallon = 128 fluid ounces
• Oil = 128 oz / 50 = 2.56 fluid ounces

For 1 liter of gasoline:

• Oil = 1 liter / 50 = 0.02 liters = 20 milliliters (ml)

For 5 liters of gasoline:

Oil = 5 liters / 50 = 0.1 liters = 100 milliliters (ml)

Quick Conversion Chart for 50:1 Mix

Step-by-Step Mixing Instructions

• Gather Your Supplies: You’ll need fresh gasoline (check octane rating recommended by your manufacturer), quality two-stroke engine oil (designed for air-cooled engines if applicable), a clean, approved fuel can, and an accurate measuring cup for oil.
• Determine Gasoline Volume: Decide how much gasoline you want to mix.
• Calculate Oil Amount: Use the formula or conversion chart above to determine the exact amount of oil needed for your gasoline volume.
• Add Oil First (Recommended): Pour the calculated amount of two-stroke oil into the empty, clean fuel can.
• Add Gasoline: Carefully add the gasoline to the fuel can. Adding the oil first helps it mix more thoroughly as the gasoline is poured on top.
• Secure and Shake: Securely cap the fuel can and gently shake it to ensure the oil and gasoline are fully mixed.
• Label Your Can: Clearly label the fuel can with the mix ratio (e.g., “50:1 Mix”) and the date it was mixed. Mixed fuel has a shelf life, typically around 30-90 days, depending on storage conditions and if a fuel stabilizer is used.

Tips for Accurate Mixing

• Use a Dedicated Measuring Device: Do not guess the oil amount. Use a precise measuring cup or syringe specifically designed for fuel mixing. Many two-stroke oil bottles come with built-in measuring compartments.
• Fresh Fuel Only: Always use fresh gasoline. Stale gasoline can cause starting problems and engine damage.
• Use Quality Oil: Invest in high-quality two-stroke engine oil that meets or exceeds your manufacturer’s specifications (e.g., ISO-L-EGD, JASO FD).
• Mix in a Well-Ventilated Area: Gasoline fumes are flammable and harmful.
• Store Properly: Store mixed fuel in an approved, airtight container away from direct sunlight and heat.
• Avoid Over-Mixing: Only mix the amount of fuel you expect to use within a reasonable timeframe.

50 to 1 Fuel Mix Calculator Tool

For quick and easy calculations, use our interactive 50 to 1 fuel mix calculator below. Simply enter the amount of gasoline you have, and it will instantly tell you how much oil you need.

Marjorie Riggs