Fertiliser Dilution Calculator
Work out how much fertiliser to mix for the water you are using, from the dose on the label. Includes half and quarter strength.
Result
Enter the numbers above to see the result.
Results are estimates to help you plan. Always follow product labels and local advice.
Enter the dose from the product label, the amount of water that dose is for, and how much water you are preparing. Use the same unit (grams or millilitres) that the label uses. Seedlings, houseplants and young plants often do better at half strength.
Tips
- Never use more than the label says. Extra fertiliser burns roots and does not make plants grow faster.
- Water the plant first if the soil is very dry, then feed.
- Measure with a proper measuring spoon or the cap, rather than guessing.
Frequently asked questions
Can I use more fertiliser for faster growth?
No. Too much fertiliser burns roots and leaf edges and can kill the plant. Follow the label, and use half strength for seedlings and houseplants if you are unsure.
What does half strength mean?
It means using half of the label dose in the same amount of water. You can feed a little more often instead of using it stronger.