Built from Primrose ratio logic
Calculate additive fast by tank size and treatment ratio.
Use this field-ready calculator to estimate exact dose, rounded dose, and converted units for ounces, quarts, and gallons. It also supports the initial-application doubling rule from the provided chart.
Inputs
Enter a fuel amount, choose a treatment ratio, and decide whether this is a regular treatment or an initial cleanup application.
Quick chart examples
These examples reflect the supplied chart style and are useful for spot checks in the field.
| Fuel gallons | Ratio | Chart-style amount | Exact ounces |
|---|---|---|---|
| 50 | 1:500 | 13 oz | 12.8 oz |
| 75 | 1:300 | 1 qt | 32.0 oz |
| 100 | 1:1000 | 13 oz | 12.8 oz |
| 250 | 1:3000 | 11 oz | 10.7 oz |
| 500 | 1:8000 | 8 oz | 8.0 oz |
| 1000 | 1:1200 | 3 qt | 106.7 oz |
Use notes
- The source chart states that ounces are rounded to the nearest full ounce.
- For initial application, the chart says to double the quantities listed.
- If tanks are old, the chart suggests doubling the additive for the first 2 to 4 applications.
- The source chart also says quantities not listed can be combined, such as 75 gallons plus 100 gallons to treat 175 gallons at the same ratio.