Dilution Ratio Calculator
A 1:10 dilution in a 32 oz spray bottle takes 2.9 oz of concentrate and 29.1 oz of water. This dilution ratio calculator splits any container size into the right amounts of concentrate and water for a 1:N ratio. The catch most people miss: 1:10 means 11 total parts, not 10, so the concentrate is the total divided by 11.
Quick answer
A 1:N ratio means 1 part concentrate mixed with N parts water.
Mix
2.909 concentrate + 29.091 water
Concentrate
2.909
Water
29.091
Total parts
11
What this tells you
- •A 1:N ratio means 1 part concentrate mixed with N parts water.
- •That makes N + 1 total parts, so concentrate = container size / (N + 1).
- •The water is everything left after the concentrate.
- •The stronger the ratio number, the less concentrate you need, 1:64 is far more dilute than 1:4.
How to Use
- 1Enter the ratio number from the product label, the N in 1:N.
- 2Enter the size of the container you are filling, in any unit.
- 3Read the concentrate and water amounts in the same unit.
- 4Add the concentrate first, then top up with water to reduce foaming.
How It Works
Formula
concentrate = total volume / (ratio + 1)A 1:10 mix has 11 equal parts, 1 concentrate and 10 water. For a 32 oz bottle, each part is 32 / 11 = 2.91 oz, so you add 2.91 oz of concentrate and 29.09 oz of water. Dividing by the ratio alone (32 / 10 = 3.2 oz) overdoses the concentrate by 10 percent, the most common mixing mistake.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
1:10 all-purpose cleaner, 32 oz bottle
11 total parts of 2.91 oz each, one of them concentrate.
1:64 heavy dilution, 1 gallon (128 oz)
Industrial cleaners often run 1:64, about 2 oz per gallon.
1:4 carpet pre-spray, 5 liters
Strong ratios like 1:4 divide neatly, 5 parts of 1 liter each.
Ounces of Concentrate per Gallon
Common ratios and the concentrate needed for one US gallon (128 oz).
| Ratio | Concentrate | Water |
|---|---|---|
| 1:4 | 25.6 oz | 102.4 oz |
| 1:10 | 11.6 oz | 116.4 oz |
| 1:16 | 7.5 oz | 120.5 oz |
| 1:32 | 3.9 oz | 124.1 oz |
| 1:64 | 2.0 oz | 126.0 oz |
| 1:128 | 1.0 oz | 127.0 oz |
Common mistakes
- Dividing by N instead of N + 1. A 1:10 mix in 32 oz needs 2.91 oz of concentrate, not 3.2 oz.
- Reading 1:10 as 10 percent. A 1:10 dilution is 9.1 percent concentrate, and a true 10 percent solution is a 1:9 ratio.
- Doubling the dose for a dirtier job. Over-concentrated cleaner leaves residue and wastes product. Repeat applications work better.
- Adding water to concentrate in a foaming product. Concentrate first, then water, or the foam steals bottle volume.