Couple of points, always try shoes on when you've been on your feet a while as they do swell a little so when on a long ride those shoes that fitted in the shop on a cold early morning will be a little bit too snug and there's nothing worse than a bike shoe that's too small!.
Most mtb/spd shoes are fine in the width sizing (I actually bought Lidl shoes as they fitted my wide feet perfectly & they were well made & cheap!)
Road shoes vary quite a bit from manufacturer to manufacturer but I'd say go for one size bigger than your standard shoe size as a starting point.
Couple of points, always try shoes on when you've been on your feet a while as they do swell a little so when on a long ride those shoes that fitted in the shop on a cold early morning will be a little bit too snug and there's nothing worse than a bike shoe that's too small!.
Most mtb/spd shoes are fine in the width sizing (I actually bought Lidl shoes as they fitted my wide feet perfectly & they were well made & cheap!)
Road shoes vary quite a bit from manufacturer to manufacturer but I'd say go for one size bigger than your standard shoe size as a starting point.