When ski techs adjusts the ski bindings,do they follow some kind of 'formula'(take height/weight into accout)

The previous answers all hit on some but not all of the parts needed.

The main components used to determine a binding setting are: Height, Weight, Ski Boot sole length, Skier Ability Type (1, 2, or 3), and Age. A ski tech must use all of these to find the binding manufacturer’s recommended setting for the binding being adjusted.

Every ski tech at every ski shop should go through a binding certification for each brand of ski bindings his shop works on. Each binding manufacturer supplies ski shops with a new binding adjustment chart every season. So even if you have a pair of last year’s bindings, ski shops are REQUIRED to use the new chart in order to protect themselves from any potential lawsuits from a customer who may say their binding was adjusted incorrectly.

There is a company based out of Vermont which is the authority on this as well as what can go drastically wrong if you just “crank” your bindings up. http://www.vermontskisafety.com/vsrfaqskiers.php

As far as your second question, a ski instructor should NEVER adjust his client’s bindings. The instructor would be liable in a lawsuit if the client should fall and injure themselves while using the recently adjusted skis. The clients normally sign a waiver on their contract form at the shop when they pick up their skis, which protects the shop who first adjusted the bindings. A ski instructor has no such protection when he touches his client’s skis. If the client is having problems “pre-releasing” out of the ski, then it is just smart to escort the client into the mountain’s repair shop and have the bindings checked by a certified technician.

Yes, most definitely. They have an adjusment chart they follow that is put out by the manufacturer and takes into consideration your weight, height and skiing ability. Weight is a big factor though because they need to adjust the binding properly so it releases if you have a nasty fall, but won't release if you are just skiing or hit a bump.

It is adjusted based on your weight mostly, but they can take your height into consideration. Follow the guide you were given, if not you can get a new one for the bindings you have on google, and you can adjust them to your settings. Also if you are skiing in powder make sure to increase the dins cause i forgot to do that last year in Vermont and ended up with a face full of bark, and a tree full of blood.. lol.. Good times..

If you're not sure what you're doing, which I'm assuming you don't or you wouldn't have asked, I would plead with you to have them adjusted at a shop. If; however, you happen to be kind of stubborn I've attached a chart. Hope you don't break anything.

Most of them follow chart systems that take the skiiers relative size (weight and height) and ability into account to select the proper tension.