Mix liquid nutrients with laboratory precision. Enter your dilution ratio, water volume, and concentration — get exact fertilizer amounts, scaled batch sizes, and a live mixing visualization.
Always follow your product label first. Manufacturer instructions override mathematical ratios. This calculator is a helpful guide — not a substitute for professional horticultural advice.
Scale your batch instantly — amounts update automatically.
From ratios to percentages — everything you need to mix with confidence.
A dilution ratio like 1:100 means one part fertilizer to 100 parts water. If you use 1 liter of fertilizer, you add 100 liters of water. The ratio tells you the relative proportion — not the final concentration. For example, a 1:100 ratio yields roughly a 1% solution (1 part in 101 total parts). Common ratios for liquid fertilizers range from 1:100 (strong) to 1:500 (gentle, for frequent feeding).
Percentage concentration tells you how much of the final solution is fertilizer. A 1% solution means 1 part fertilizer per 100 parts total solution. This is slightly different from a 1:100 ratio (which gives ~0.99%). For most gardening purposes, the difference is negligible — but for precise laboratory or hydroponic work, it matters. Our calculator handles both methods and shows you the exact final concentration.
Always use a dedicated measuring cup or syringe for fertilizers — never kitchen utensils. For small batches, a milliliter syringe gives the best precision. For larger volumes, use a graduated jug. Remember: it's easier to add more fertilizer than to remove it, so start conservative and adjust. Our calculator gives you exact amounts in milliliters, fluid ounces, and liters.
Scaling a fertilizer recipe is simple: multiply both the fertilizer and water by the same factor. If your recipe calls for 10 mL in 1 L and you want 5 L, use 50 mL in 5 L. Our batch scaling buttons let you instantly see amounts for ½×, 2×, 5×, 10×, and 20× batches. The ratio stays the same — only the total volume changes.
Every fertilizer is different. Some are salt-based and can burn roots at high concentrations. Others are organic and gentler. The manufacturer's label is based on their specific formulation — it accounts for solubility, pH, and safe application rates. Our calculator helps you execute those instructions accurately, but never overrides them. If your label says 1:200 and our calculator suggests 1:100 for a different product, follow your label.
It means 1 part fertilizer to 100 parts water. For example, 10 mL of fertilizer mixed with 1000 mL (1 L) of water. This produces roughly a 1% solution. Always check your product label — some plants prefer weaker dilutions like 1:200 or 1:500.
Divide 1 by the total parts. For 1:100, the total is 101 parts, so 1 ÷ 101 ≈ 0.99%. For 1:200, it's 1 ÷ 201 ≈ 0.5%. Our calculator does this automatically and shows both the ratio and the final concentration.
Yes — but hydroponic nutrient solutions often use PPM (parts per million) rather than simple ratios. Our percentage mode helps, but for precise hydroponic work, always use a TDS/EC meter and follow your nutrient brand's specific schedule.
This calculator is designed for liquid concentrates. For powders, dissolve the recommended amount in a small volume of warm water first, then dilute to your final volume. The ratio math is the same, but the measurement is by weight (grams) rather than volume (mL).
5 gallons ≈ 18.93 liters. For a 1:100 ratio, you'd need 18.93 ÷ 100 ≈ 0.189 L (189 mL) of fertilizer. Our calculator handles the conversion automatically — just enter 5 gallons and it shows you the exact amount in mL, fl oz, and liters.
NPK stands for Nitrogen, Phosphorus, and Potassium — the three primary macronutrients. The numbers represent the percentage by weight of each nutrient in the fertilizer. 10-10-10 means 10% nitrogen, 10% phosphorus, and 10% potassium. The remaining 70% is inert filler or secondary nutrients.
Because the total solution includes both the fertilizer and the water. A 1:100 ratio gives 1 part fertilizer in 101 total parts, which is ~0.99%, not exactly 1%. For most gardening, this difference is negligible — but our calculator shows you the exact percentage so you always know.
Some can be mixed, but many react poorly — especially calcium-based and phosphate-based products, which can precipitate and become unavailable to plants. Always check compatibility charts or mix in a small test batch first. When in doubt, apply separately with a few days between applications.
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