Skip to main content
HydroCalc

Mix nutrient solutions with confidence.

Turn your target values into exact grams and volumes, from concentrated stock to the reservoir.

Runs in your browser

The maths happens on your device. Nothing you type is sent to a server.

No tracking, no banners

No analytics, no ads, and no cookie consent to click away.

Hosted in the EU

Accounts and saved recipes sit on servers in Frankfurt.

Three steps from target value to reservoir.

01

Pick your line and stage

Choose a nutrient line from the catalog, your water, and the growth stage you are in.

02

Mix a stock solution

Set your own concentration factor and batch volume, or dose the reservoir directly.

03

Dose and top up

Get exact grams and millilitres for the reservoir size you actually have.

Bottled nutrients or raw salts.

Ready-made nutrient lines

Pick a brand and line from the curated catalog. You get per-stage doses and an estimated EC for every step.

Open the calculator

Raw single salts

Set a target profile in ppm, pick the salts on your shelf, and get exact doses.

Open the salt mix

Every value, out in the open.

The reference lists each curated line with its per-stage doses and EC factors, next to pH targets and a safe mixing order. Every value is a starting point, so always check EC and pH at the tank.

Browse the reference

Save your recipes and reuse them.

A free account keeps your mixes and stock solutions ready for next time. You can export or delete everything yourself, at any point.

Create a free account