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Fertilizer Calculator

Ecology
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This calculator determines the amount of fertilizer needed to achieve the desired nutrient levels in soil.

More tools:Animal & Pet Calculators
How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Area to fertilize, Current nutrient level, Desired nutrient level, and Fertilizer nutrient content in the units shown.

Step 2

Read Amount of fertilizer needed in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Small Garden

Area to fertilize: 50 squareMeters; Current nutrient level: 5 percent; Desired nutrient level: 15 percent; Fertilizer nutrient content: 40 percent

Amount of fertilizer needed: 12.5 kilograms

Medium Garden

Area to fertilize: 200 squareMeters; Current nutrient level: 10 percent; Desired nutrient level: 25 percent; Fertilizer nutrient content: 50 percent

Amount of fertilizer needed: 60 kilograms

Large Field

Area to fertilize: 1,000 squareMeters; Current nutrient level: 20 percent; Desired nutrient level: 35 percent; Fertilizer nutrient content: 60 percent

Amount of fertilizer needed: 250 kilograms

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