Gasoline & 2-Cycle Oil Mixer
Two-Stroke Oil Mixer Calculator
Calculate the exact amount of 2-cycle oil needed for any gas can size and mix ratio (50:1, 40:1, 32:1, etc.) in US fluid ounces, cups, tablespoons, and milliliters.
Mixer Inputs
1 US Gal = 128 fl oz
Result
Required 2-Stroke Oil
Fluid Ounces
6.40 fl oz
Tablespoons
12.8 tbsp
Measuring Cups
0.80 cup
Milliliters
189.3 mL
Mix 6.40 fl oz of 2-cycle oil with 2.50 gallons of gas.
50:1 Mix (2.56 oz / gal)
US Gas-to-Oil Ratio Quick Chart
US Fluid Ounces| Ratio | 1 Gallon | 2 Gallons | 2.5 Gallons | 5 Gallons | Common Equipment |
|---|---|---|---|---|---|
| 50:1 | 2.56 oz (76 mL) | 5.12 oz (151 mL) | 6.40 oz (189 mL) | 12.80 oz (379 mL) | Stihl, Husqvarna, Echo, Outboards |
| 40:1 | 3.20 oz (95 mL) | 6.40 oz (189 mL) | 8.00 oz (237 mL) | 16.00 oz (473 mL) | Ryobi, Craftsman, Poulan, Toro |
| 32:1 | 4.00 oz (118 mL) | 8.00 oz (237 mL) | 10.00 oz (296 mL) | 20.00 oz (591 mL) | Dirt Bikes (YZ/KTM), Motocross |
| 25:1 | 5.12 oz (151 mL) | 10.24 oz (303 mL) | 12.80 oz (379 mL) | 25.60 oz (757 mL) | Vintage Chainsaws & Engines |
| 16:1 | 8.00 oz (237 mL) | 16.00 oz (473 mL) | 20.00 oz (591 mL) | 40.00 oz (1.18 L) | Break-in & Antique Engines |
Frequently Asked Questions
How much 2-stroke oil goes in 1 gallon of gas?
For a 50:1 mix, use 2.56 fl oz (76 mL). For a 40:1 mix, use 3.20 fl oz (95 mL). For a 32:1 mix, use 4.00 fl oz (118 mL).
What is the mathematical formula?
Oil (fl oz) = (Gas Gallons × 128) / Ratio Number. For example, 2.5 gallons at 50:1 = (2.5 × 128) / 50 = 6.4 fl oz.
What gasoline is recommended for 2-cycle engines?
Ethanol-free (recreational) 89 to 93 octane gasoline is best. Ethanol absorbs moisture and causes carburetor corrosion in stored fuel.