Your purchase notes
Keep the details in one place.
Keep the worktop cut-out and outer dimensions as separate measurements. Then check the supply and installation requirements.
Use the manufacturer’s installation drawing for the cut-out and clearances. A familiar width category does not establish whether a replacement will fit an existing opening.
Space and clearance checker
Check one dimension at a time using measurements you have verified. Enter the clearance from the exact product instructions; this calculator does not decide a safe installation allowance.