Is it worth converting 20 halogen lights to led?

I have 20 halogen down lighters.

no idea how much they cost to run.

ive had for 10 years and only changed 2 bulbs.

would the cost ov converting to led be more than my savings please?

most likely yes. LED GU10's are not expensive

Are they 12v halogen or 230v haologen?

If they are 12v your existing transformers may not work with them

Do you know what power rating your lamps are?   

Halogen lights are typically;  20watt,  35watt or 50watt each

So guessing at a few calculations...

If you have 20 lamps you could have around 400watts to 1000watts of power consumed.

Or for 1 unit of electricity you will get between;  One to Two & half hours worth of use.

And some common LED power ratings could be around  4, 5 or 6 watts each...

So with 20 LEDs you could have around 80watts to 120watts of power consumed.

Or for 1 unit of electricity you will get between;  Eight hours twenty minutes  to  Twelve and half hours worth use.

So once you have accounted for the supply and fitting of replacement lamps...

the running costs can give significant electrical consumption savings...

BUT another factor that can cause issues if if the lamps are controlled by Dimmer switches..?

LED's and dimming can be a lot more hassle than just normal off/on switch..

As you need to replace switches as well!

:coffee

Plus, don’t go chasing savings in rooms you rarely use.

priorities are normally 

kitchen

hall / landing

ie the rooms you use the most and /or leave lights on

updating lights in a spare bedroom probably isn’t work the investment 

AND LED bulbs don’t last as long as many companies claim