Hydroponics tool
Fertilizer PPM Calculator
Estimate nutrient ppm from fertilizer amount, water volume, and nutrient percentage for hydroponics, indoor growing, fertigation, and custom feed planning.
Amount of fertilizer you add to the water.
Choose the unit used for fertilizer amount.
Total water volume used for the solution.
Choose liters or US gallons.
Percentage of the nutrient element in the fertilizer, for example nitrogen at 20%.
Recommended products for nutrient mixing
Fertilizer or meter
A useful product for ppm-based feeding, nutrient measuring, or recipe building.
Fertilizer or meter
A useful product for ppm-based feeding, nutrient measuring, or recipe building.
Fertilizer or meter
A useful product for ppm-based feeding, nutrient measuring, or recipe building.
Total fertilizer amount added to the solution.
Choose grams, kilograms, or milligrams.
Total amount of water in the solution.
Choose liters or US gallons.
Nitrogen percentage in the fertilizer.
Phosphorus percentage used for direct ppm calculation.
Potassium percentage used for direct ppm calculation.
Calcium percentage, if applicable.
Magnesium percentage, if applicable.
Recommended products for ppm-based feeding
Fertilizer or meter
A useful product for ppm-based feeding, nutrient measuring, or recipe building.
Fertilizer or meter
A useful product for ppm-based feeding, nutrient measuring, or recipe building.
Fertilizer or meter
A useful product for ppm-based feeding, nutrient measuring, or recipe building.
Desired ppm of the nutrient element in the final solution.
Amount of water you want to prepare.
Choose liters or US gallons.
Percentage of the target element inside the fertilizer.
Choose the unit you want for the required fertilizer amount.
Recommended products for target ppm mixing
Fertilizer or meter
A useful product for ppm-based feeding, nutrient measuring, or recipe building.
Fertilizer or meter
A useful product for ppm-based feeding, nutrient measuring, or recipe building.
Fertilizer or meter
A useful product for ppm-based feeding, nutrient measuring, or recipe building.
Fertilizer ppm calculator for hydroponics and indoor growing
This fertilizer ppm calculator helps growers estimate the ppm contribution of a fertilizer based on how much product is added, how much water is used, and what percentage of a nutrient element is present in the fertilizer. It is useful for hydroponics, coco, fertigation, indoor growing, greenhouse feeding, and nutrient recipe planning.
Use it to estimate nitrogen ppm, phosphorus ppm, potassium ppm, calcium ppm, magnesium ppm, or any other nutrient element where you know the percentage content of the fertilizer being used.
How this ppm calculator works
The calculator first works out how much of the nutrient element is actually present in the fertilizer amount added. It then divides that nutrient mass by the water volume to estimate mg/L, which is numerically equivalent to ppm in dilute water-based solutions.
What each parameter means
- Fertilizer amount: how much product is added to the solution.
- Water volume: total amount of water used for the nutrient solution.
- Nutrient percentage: percentage of the target element inside the fertilizer.
- ppm: estimated concentration of the nutrient element in the final solution.
- mg/L: milligrams of nutrient per liter of water, numerically close to ppm for most grow solutions.
Why ppm matters
Ppm helps growers understand how much of a specific nutrient element is reaching the root zone. This is useful when designing feed recipes, comparing fertilizers, adjusting nutrient strength, diagnosing imbalances, or trying to maintain more consistent feeding between crops, stages, or water sources.
The calculator estimates nutrient-element ppm, not the total EC reading of the solution.
Target ppm helper
The target ppm helper works in reverse. Instead of estimating ppm from a known fertilizer amount, it estimates how much fertilizer is needed to reach a chosen nutrient ppm target at a given water volume. This is useful when building custom feeding recipes for hydroponics and fertigation.
It is especially practical for dry salts, powdered feeds, and single-element adjustments.
Best practice for growers
- Use the correct percentage for the actual nutrient element you want to estimate.
- Check whether your label values match elemental form or oxide form.
- Measure water volume accurately before calculating ppm.
- Use ppm calculations together with EC and pH monitoring, not as a full replacement.
- Keep records of ppm targets that work best for your crop and environment.
Shipping. 3 day EU delivery
7 to 15 EUR under 30kg. See more on Shipping details page.
60 days returns
You can get a refund or replacement after up to 30 days from purchase.
But we ussualy stand on customers side, so we can give a 60 days time frame!
2 months post sale expert support
It's free.
We are a team of 10 with a decade of wise expirience in growing and gardening, so if you'll have any need of help, we'll guide you to your goal within 2 months from a purchase.
About us. Our 9 year history
GoToGarden started in 2017 out of personal frustration. Our founder was a hobby grower who spent hours navigating online shops that felt built by people who had never touched a plant — cluttered layouts, vague product descriptions, no real guidance on what to actually buy or why. He knew there had to be a better way.
See more on About us page
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