Using the comparison tool
Enter between two and five UK postcodes, separated by commas. The tool fetches each one's elevation and shows them ranked from highest to lowest, with the headline difference in feet and metres at the top.
When is this useful?
House-hunting is the obvious case — if you're weighing up a flat in the bottom of the valley versus a terrace on the ridge, the elevation difference can matter for heating costs, flood risk, views and garden drainage. It's also a useful sanity check when planning routes, comparing climate exposure between two homes, or just settling the pub argument about whose house is highest.
Single postcode lookup
If you only want to check one postcode, use the elevation lookup tool, which includes a full profile with UK rank, percentile, and a map.