Enter your item's dimensions and weight to find out its format and approximate postage cost.
Need to resize your shipping label? Once you know your format, use the Label Resizer to get your label print-ready.
Royal Mail uses four main formats to determine postage rates. Getting the right format saves money and ensures faster delivery.
The smallest and cheapest option for flat items.
For items that don't fit in a standard letter envelope.
For parcels up to 2kg, with compact dimensions.
Larger parcels up to 20kg.
Many sellers overpay by sending items as Small Parcels when they'd fit in a Large Letter. If your item fits the Large Letter dimensions, use that instead — you'll save significantly on postage costs and often get faster delivery.
You'll need Royal Mail Special Delivery or a specialist courier like DPD or FedEx. Special Delivery is tracked and guaranteed next-working-day.
Yes, if it's up to 25mm thick. Royal Mail will attempt letterbox delivery for items in Large Letter format up to that thickness.
1st Class is faster (usually next working day) and more expensive. 2nd Class is slower (2–3 working days) but significantly cheaper. Choose 2nd Class for non-urgent items to reduce postage costs.
Standard Royal Mail compensation is limited. For valuable items, consider buying additional insurance or using a tracked service like Special Delivery Guaranteed.
This tool uses the official Royal Mail format specifications. However, Royal Mail may occasionally update requirements or apply edge-case rules, so always verify with royalmail.com before sending high-value items.