How much fertilizer or chemical product do I need to get a certain concentration (ppm)?

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Enter the units. If you specify metric, the app calculates in grams and liters. If you specify "U.S." the app calculates in ounces and gallons (U.S.).

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Whether the product is solid or liquid determines the units used for calculations

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Enter the target final concentration of active ingredient in the product in ppm (parts per million - which is the same as milligrams per liter.)

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Read the product label to know the percent of active ingredient

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Enter the tank volume. If you specified "metric" units, enter the number of liters. If you specified "US/Imperial" units, enter the number of gallons.

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If you are not using an injector (dilutor), set the dilution ratio value to 1. If you are using an injector, for example at 1:100 dilution, enter the dilution ratio (in that case 100).

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Specific gravity is only relevant for liquids. It is the ratio of the mass of the material to the mass of an equal volume of water. The specific gravity of liquid water at 4C is 1.0 and its density is 1 kg/L. In many cases specific gravity for a liquid chemical or fertilizer will approximately equal 1. However, the liquid may be more or less dense than water. For example, 1 liter of 35% sulfuric acid weight 1.259 kg (denser than water), so its specific gravity is 1.259.