Weigh it right the first time.
A nutrient formula solver for hydroponic and aquaponic growers. Tell it what your plants need and which salts you have on the shelf. It works out how many grams of each to weigh, splits them into an A and a B stock so nothing precipitates, and prices the batch.
Choose the strength of the solution, measured as electrical conductivity (EC).
Start from a published recipe such as the Bugbee standard, or your own.
Adjust nitrogen, phosphorus, potassium and the rest with sliders, in parts per million.
See the nutrient profile against your target, how far each element is off, and what the batch costs.
Follow the production guide: grams per stock tank, A and B kept apart, and the dilution ratio.
EC measures total dissolved salts in millisiemens per centimetre. Slide to see where a reading falls.
Nitrogen drives leaves and stems. Phosphorus builds roots, flowers and fruit. Potassium strengthens the plant. Growing stages want more nitrogen; flowering wants less nitrogen and more P and K.
Calcium and sulfate cannot share a concentrated tank: Ca²⁺ + SO₄²⁻ → CaSO₄↓, an insoluble crust. Part A carries the calcium; Part B carries the sulfates and phosphates. They meet only once diluted.
Every salt brings more than one nutrient, so an exact match rarely exists. NuTruCalc solves for the closest mix (singular value decomposition) and reports how far each element is off.
Each chemical in your library carries a price, so you can compare formulations and find the cheapest one that still meets the target.
Open it and go: pick your salts, load a recipe, solve, and follow the mixing guide. Nothing to install. It can't save your formulas or change the shared chemical list.
Runs on your own computer with everything switched on: saved formulas, your own products and prices, supplier price lookup, and sending a recipe to dosing pumps over MQTT. Needs Python 3.10 or newer; double-click the start file and it opens in your browser.
Windows: start-windows.bat · Mac / Linux: sh start-mac-linux.sh
After you solve, press Ask Orion's Garden. Your targets, EC, pH and stage open in Orion's Garden, which reviews them against a library of cultivation and hydroponics books, says which numbers sit below, inside or above the published ranges, and cites each source. Adjust, then solve again here. The recipe travels in the part of the link after the #, which browsers never send to a server.