On-line Fuel Mix Calculators

NOTE:
All INPUTS must be numeric and greater than zero – No Input Validation is performed!!!

Many power tools use 2 stroke / 2 cycle engines, such as grass trimmers, leaf blowers, chainsaws, some older lawn mowers and small outboard motors. These engines are small and light with no crankcase for oil. Essential lubrication of the engine is achieved by mixing Oil and Gasoline in proportions specified by the manufacturer.

Calculate the amount of oil to be added to a tank of gasoline
for use in a 2-cycle engine of a given oil/gas mix ratio:

US Only Calculation

Some version of windows fail to perform the calculations.

Try the Source if it is still available

Other Calculators from the same source

2 stroke engine problems

Solutions – to 2 stroke engine problems

If your boat is powered by 2-cycle Outboard Motors, you have the same problems I have. Gas must have oil mixed with it, or you risk burning up the engine. If you don't mix enough oil/gallon, you risk damaging your engine. If you have too much oil in your mix, you can bet you will foul out your plugs.

I use two outboards on my boat, one for main power, and a smaller one for emergency use or trolling. Each engine has a different oil/gas mix ratio. This means, for one thing, separate tanks/engine. Confusion could turn a great trip into a disastrous one. Since I don't carry a computer to do the calculations, my solution is to carry fuel mixing charts and formulas with me. These formulas are incorporated into the calculators and charts displayed below.

Table of Ounces (US) of Oil to Add - Based on the above Formula

Gallons (US)	16:1	24:1	32:1	40:1	50:1	60:1	75:1	100:1

1	8	5.3	4	3.2	2.6	2.1	1.7	1.3
2	16	10.7	8	6.4	5.1	4.3	3.4	2.6
3	24	16	12	9.6	7.7	6.4	5.1	3.8
4	32	21.3	16	12.8	10.2	8.5	6.8	5.1
5	40	26.7	20	16	12.8	10.7	8.5	6.4
6	48	32	24	19.2	15.4	12.8	10.2	7.7
7					17.9	14.9	11.9	9
8					20.5	17.1	13.7	10.2
9					23	19.2	15.4	11.5
10					25.6	21.3	17.1	12.8
11					28.2	23.5	18.8	14.1
12					30.7	25.6	20.5	15.4
13					33.3	27.7	22.2	16.6
14					35.8	29.9	23.9	17.9
15					38.4	32	25.6	19.2
16					41	34.1	27.3	20.5
17					43.5	36.3	29.0	21.8
18					46.1	38.4	30.7	23
19					48.6	40.5	32.4	24.3
20					51.2	42.7	34.1	25.6

You have two 2-cycle engines, that have different oil/gas mix ratios. Engine 1 requires less oil to be added per gallon than does engine 2. Engine 2 has run out of fuel, and you would like to use the fuel in engine1's tank. Calculate ounces of oil to be added to engine 1's tank, in order to make the oil/gas ratio equal to that of engine 2.

* (negative value indicates mix ratios entry error)

Table of Ounces (US) of Oil to Add When Changing Ratios

From Ratio	To Ratio	Existing Premixed Gallons (US)

From Ratio	To Ratio	0.5	1.0	2.0	3.0	4.0	5.0	6.0
24:1	16:1	1.3	2.7	5.3	8	10.7	13.3	16
32:1	24:1	0.7	1.3	2.7	4	5.3	6.7	8
32:1	16:1	2	4	8	12	16	20	24
40:1	32:1	0.4	0.8	1.6	2.4	3.2	4	4.8
	24:1	1.1	2.1	4.3	6.4	8.5	10.7	12.8
	16:1	2.4	4.8	9.6	14.4	19.2	24	28.8
50:1	40:1	0.3	0.6	1.3	1.9	2.6	3.2	3.8
	32:1	0.7	1.4	2.9	4.3	5.8	7.2	8.6
	24:1	1.4	2.8	5.5	8.3	11.1	13.9	16.6
	16:1	2.7	5.4	10.9	16.3	21.8	27.2	32.6
60:1	50:1	0.2	0.4	0.9	1.3	1.7	2.1	2.6
	40:1	0.5	1.1	2.1	3.2	4.3	5.3	6.4
	32:1	0.9	1.9	3.7	5.6	7.5	9.3	11.2
	24:1	1.6	3.2	6.4	9.6	12.8	16	19.2
	16:1	2.9	5.9	11.7	17.6	23.5	29.3	35.2
75:1	60:1	0.2	0.4	0.9	1.3	1.7	2.1	2.6
	50:1	0.4	0.9	1.7	2.6	3.4	4.3	5.1
	40:1	0.7	1.5	3	4.5	6	7.5	9
	32:1	1.1	2.3	4.6	6.9	9.2	11.5	13.8
	24:1	1.8	3.6	7.3	10.9	14.5	18.1	21.8
	16:1	3.1	6.3	12.6	18.9	25.2	31.5	37.8
100:1	75:1	0.2	0.4	0.9	1.3	1.7	2.1	2.6
	60:1	0.4	0.9	1.7	2.6	3.4	4.3	5.1
	50:1	0.6	1.3	2.6	3.8	5.1	6.4	7.7
	40:1	1	1.9	3.8	5.8	7.7	9.6	11.5
	32:1	1.4	2.7	5.4	8.2	10.9	13.6	16.3
	24:1	2	4.1	8.1	12.2	16.2	20.3	24.3
	16:1	3.4	6.7	13.4	20.2	26.9	33.6	40.3

You have two 2-cycle engines, that have different oil/gas mix ratios. Engine 1 requires less oil to be added per gallon than does engine 2. Engine 1 has ran out of fuel, and you would like to use the fuel in engine 2's tank. Calculate gallons of gas to be added to engine 2's tank, in order to make the oil/gas ratio equal to that of engine 1.

* (negative value indicates mix ratios entry error)

Table of Gallons (US) of Gas to Add When Changing Ratios

From Ratio	To Ratio	Existing Premixed Gallons (US)

From Ratio	To Ratio	0.5	1.0	2.0	3.0	4.0	5.0	6.0
16:1	24:1	0.3	0.5	1	1.5	2	2.5	3
16:1	32:1	0.5	1	2	3	4	5	6
24:1	32:1	0.2	0.3	0.7	1	1.3	1.7	2
	40:1	0.3	0.7	1.3	2	2.7	3.3	4
	50:1	0.5	1.1	2.2	3.2	4.3	5.4	6.5
32:1	40:1	0.1	0.2	0.5	0.7	1	1.2	1.5
	50:1	0.3	0.6	1.1	1.7	2.3	2.8	3.4
	60:1	0.4	0.9	1.8	2.6	3.5	4.4	5.3
	75:1	0.7	1.3	2.7	4	5.4	6.7	8.1
	100:1	1.1	2.1	4.3	6.4	8.5	10.6	12.7
40:1	50:1	0.1	0.3	0.5	0.8	1	1.3	1.5
	60:1	0.3	0.5	1	1.5	2	2.5	3
	75:1	0.4	0.9	1.8	2.6	3.5	4.4	5.3
	100:1	0.8	1.5	3	4.5	6	7.5	9
50:1	60:1	0.1	0.2	0.4	0.6	0.8	1	1.2
	75:1	0.2	0.5	1	1.5	2	2.5	3
	100:1	0.5	1	2	3	4	5	6
60:1	75:1	0.1	0.2	0.5	0.7	1	1.2	1.5
60:1	100:1	0.3	0.7	1.3	2	2.7	3.3	4
75:1	100:1	0.2	0.3	0.7	1	1.3	1.7	2

View/Print Tables

Source – Borrowed the code to make sure it does NOT vanish with time

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Mix Ratio (example: if ratio is 50:1, enter 50)
Gasoline	Gallons (US) Gallons (Brit) Litres

Ounces (US) of Oil to Add
Pints (US) of Oil to Add
Ounces (Brit) of Oil to Add
Pints (Brit) of Oil to Add
Millilitres of Oil to Add