Roughly working out the inputs for my sheep -
Initial purchase
Grass keep (rental, or value of land).
Equipment (Hurdles, drench guns, digging shears etc etc).
Medical Supplies - Heptavac, Toxo, Enzo, any anti biotics you use, wormers, fly prevention. Fec's.
Water in some places.
Any forage (i.e hay or fodder beet) or hard feed bought in over winter. Along with mineral licks.
Shearing (if you need to, and if you don't do it yourself)
Fuel.
My time.
You'd be surprised at the costs when you add them up. But it's worth doing, as it allows you to see where you can reduce inputs.