Hi Matt,
I started to reply to this post a couple of days ago- but after typing up a lengthy list in Word, my reply was timed out and I lost the lot! Think there is something to be said in that the list was sooooo long!
Firt bit of advice - Get some good library books, trawl this forum- almost everything I have learnt is from here!
There is so much to factor in, and if I have learnt anything this last year of keeping 5 hens- it is more costly than we could have imagined. It takes up a pleasant and enjoyable amount of time which for me is no problem. Half an hour in the morning poop scooping, and sorting water food. Then for me there is "cuddle time", and "chicken watching" with a cup of coffee in hand- as I am sure almost everyone on here would agree!!
I keep a spreadsheet, just because I am super organised, sad and costs are relevant to our current financial situation.
Over this last year, (we had them last Feb) our girls have cost us £22 per week. I know this sounds ridiculous, but after factoring in purchasing 4 houses- (a few cheap mistakes). Also, the sanitising products, first aid items, a couple of vets trips- it all adds up. The actual feed and bedding for our five is the smallest part of the outlay.
HOWEVER- We couldn't imagine life without our girls-they are part of the family. We are now looking to add a couple more to our little flock. (we have a spare house

11 )
Was surpised just how many mealworms tubs I have bought over the year
Oh and we give the eggs away.......
Sharron