It’s important to know the correct 2 stroke mix ratio for your engine. The first thing you need to do is check the manual that came with your machine. It should tell you the correct ratio required for your 2-stroke mix. If you can’t find the specific ratio for your mix, 40:1 is accepted as an average ratio for two-stroke engines. This is 125mls of two stroke oil to 5L of fuel. 2 Stroke Fuel Mix Calculator Quickly and accurately calculate fuel/oil mixes easily in seconds! To calculate the amount of oil you need to get the exact 2stroke oil ratio for your 2–stroke engine, use our fuel ratio calculator. 2 Stroke Oil Mix Calculator 2 Stroke Oil Mix Ratio : 1 Quantity Of Petrol/Gas Litres 400 milliliters of oil for 2 liters of gas at 5:1 Whether you need a 50 1 calculator, 40 1 calculator or any oil to petrol ratio, our 2 stroke oil mix calculator can tell you exactly how much oil you need per litre of fuel. Got another ratio and need to work out how much oil to add? Then just enter your ratio and oil amounts in our 2 stroke fuel calculator above. What Machines use 2 Stroke Engines? Even though most cars and motorcycles have four-stroke motors, there are still a few bikes with two-stroke engines (also known as two-cycle engines) . Also plenty of other machines use two-stroke engines — like model aeroplanes, chainsaws, mowers, leaf blowers, string trimmers / whipper snippers, construction machinery, and snowmobiles. What is 2 stroke fuel? Two stroke fuel is basically unleaded petrol mixed with 2 stroke oil. The oil to fuel mix ratio should be specified in your engines instruction manual. The oil in 2 stroke fuel is extremely important in lubricating your engine as two stroke engines do not have an internal oil reservoir. Without the oil, you risk destroying your engine. That is why it is so important to get your 2stroke oil mix right the first time! Why Shouldn’t You Put Straight Petrol into a Two Stroke Engine? Four stroke petrol is straight unleaded petrol (known in the USA as Gas) will rapidly reduce the lifespan of your 2 stroke engine — and by a considerable amount. This is the wrong fuel for a 2 stroke motor, as it doesn’t provide the quality of lubrication that you need. It almost goes without saying, by forcing an engine to run without the correct lubrication you are almost guaranteed in damaging the piston and cylinders. Unfortunately, it’s hard to replace these parts and can be expensive, as its what you call an “engine rebuild”. This is easily preventable just by mixing the fuel and oil correctly. What is the best 2 stroke ratio? The precise 2 stroke oil ratio depends on your manufacturers instructions, as each engine can have varied requirements. The two stroke mix ratio depends on the year your equipment was made, and/or the make of your equipment. Your mix needs to be as accurate as possible, putting neither too much, or too little oil. If you put too much, it may stop the engine, generate carbon buildup, and blow smoke which is particularly bad for the environment. But if you put in too little, it will (with time) damage your engine permanently and overheat. 40 to 1 ratio If you are unsure 40:1 is a middle range 2 stroke fuel ratio. This equals 25mls of two stroke oil to 1 litre of petrol. It is pretty easy to calculate, you just multiply the litre amount by 25. But since we like to keep things as simple as possible you work out your 40 to 1 mix with our calculator above, we have included a 40:1 mix chart for both litres and gallons. 40:1 Fuel mix chart Litres Many brands also recommend a 40 to 1 ratio, if that’s the case then just input into our calculator ’40’ in as the ‘2 stroke oil mix ratio’ and ‘1’ as the quantity and it will work as a 40 to 1 calculator for you. But if you are wanting a physical table that shows the 40 to 1 mix in Litres, the chart below will give you the correct measurements. Fuel – Litres (L) Oil – Millitres (mls) 1 25 2 50 3 75 4 100 5 125 6 150 7 175 8 200 9 225 10 250 12 300 14 350 16 400 18 450 20 500 40 to 1 Fuel Mix Chart Gallons The following is a 40 to 1 Fuel Mix Chart in Gallons. You can print this handy table and keep it in your shed so you always have it available. Just remember, if you ever need to work out your 40:1 ratio in gallons just multiple the number of gallons by 3.2, so a 40 to 1 oil mix for 6 gallons is 19.2fl oz. Fuel – Gallons (gal) Oil – Fluid Ounce (fl oz) 1/2 1.6 1 3.2 1.5 4.8 2 6.4 2.5 8 3 9.6 3.5 11.2 4 12.8 4.5 14.4 5 16 5.5 17.6 6 19.2 6.5 20.8 7 22.4 7.5 24 50 to 1 ratio The best thing about the 50 to 1 ratio is that it is so each to calculate! To work out this 2 stroke ratio, all you need to do is multiply the litre amount by 2 and add a zero. But as you know we like to keep things as simple as possible. So not only can you work out your 50 to 1 mix with our calculator above, we have included a 50:1 mix chart for both litres and gallons. 50:1 Fuel mix chart Litres Many brands also recommend a 50 to 1 ratio, if that’s the case then just input into our calculator ’50’ in as the ‘2 stroke oil mix ratio’ and ‘1’ as the quantity and it will work as a 50 to 1 calculator for you. But if you are wanting a physical table that shows the 50 to 1 mix in Litres, the chart below