What it does
Quoting an IHC conversion means counting: how many switch inputs the panel has, how many outputs, how many of those outputs are dimmed, and where a wireless button is cheaper than pulling a wire. Turning that count into a parts list is mechanical work that takes an hour and is easy to get wrong by one device.
The calculator does that step. You enter the counts; it returns the Shelly devices that cover them, with quantities.
It assumes the three conversion methods described in IHC to Shelly conversion. Read that first if you have not decided which method each circuit gets — the answer changes the parts list more than the counts do.
Open the calculator
Open the tool IHC to Shelly calculator Inputs, outputs and wireless buttons in — a complete parts list out. Opens on ihc-beregner.shelly.guide — opens in a new windowIt runs on its own address rather than inside this page.
Reading the result
It is a starting point, not a specification. The list reflects what we would fit. Other combinations work, and a panel with an unusual constraint — width, an existing supply worth keeping, a circuit that must survive a network outage — will justify departing from it.
Check panel width before ordering. The cheapest parts list per output is not always the one that fits. This is the constraint that most often forces a rethink, and it is the one the calculator cannot see.
Save or print it with the quote. In six months the list is the only record of what the count was, and the next electrician in that panel will be working from it.