Help! How long do you cook a roast?

[~Kaz~]

I have tried to search for this in old threads without luck. I know it's basic and something I should know but I don't

Ok. So I have a 650gm topside roastbeef. I have a 600 gas oven (fan forced). I know there's some kind of formula for how many minutes per kg etc but even google is not my friend this afternoon. Can someone please give me some kind of idea how long I should cook this for and at what temperature??

Thanks so much!!!

[Muppity]

I usually go 20 minutes for the roast (at 220C) and then 1/2 hour for every 500g (at 180C) so if it was 500g it would get 50 minutes - so you would be about an hour.

ETA - I like mine medium to well done on that timing

[~Kaz~]

Oh thanks Muppity! We're more medium-rare people in this house but 45-50 mins sounds like it would do. I also read in my google search that the temp of the meat can go up during the resting afterwards.

ETA - Roast was delish Muppity!

[Muppity]

Glad to hear it