Parcel Weight KG vs Stone
The UK Shipper's Complete Conversion Guide
For a quick reference, 10 kg is 1 stone 8 pounds (1 st 8.0 lb exactly). This guide converts common UK courier thresholds from kilograms into stone and pounds, then explains volumetric weight and why the carrier's current rules still matter.
The Weight Problem UK Sellers and Movers Face
When you're packing a box to send through Royal Mail, Parcelforce or a courier like DPD, every pricing tier is defined in kilograms. But if you're a small business owner packing goods in your kitchen, or someone shipping household items while moving abroad, your instinct is to pick up a box and think 'that's about half a stone', not 3.2 kg.
This guide converts common UK and international shipping weight tiers into stone and pounds and explains the volumetric-weight rule that can make a large, light parcel chargeable by size. You can also use our main kg to stone converter for custom labels.
UK Carrier Weight Tiers in Stone and Pounds
Every carrier prices by weight bracket. Move above a bracket ceiling and you jump to the next price band, even if you are only 100 grams over.
| Weight (kg) | In Stone & Lbs | Carrier Threshold |
|---|---|---|
| 0.1 kg | 100g / 3.5oz | Royal Mail Small Letter Max |
| 0.5 kg | 1.1 lbs | Royal Mail Small Letter (mid-tier) |
| 1 kg | 2.2 lbs | Royal Mail Small Parcel entry |
| 2 kg | 4.4 lbs | Royal Mail Small Parcel ceiling |
| 5 kg | 11 lbs | Royal Mail Medium Parcel mid-tier |
| 10 kg | 1 st 8 lb | Parcelforce entry threshold |
| 20 kg | 3 st 2.1 lb | Royal Mail absolute max |
| 30 kg | 4 st 10.1 lb | Parcelforce absolute max |
Key thresholds: 2 kg (end of small parcel), 20 kg (Royal Mail hands off to Parcelforce).
Volumetric Weight: The Rule That Catches Everyone Out
Express carriers (DHL, FedEx, UPS, Parcelforce) charge based on whichever is higher: the actual weight on a scale, or the volumetric weight. A parcel can be extremely light but physically large, and you will be charged for its size, not its mass.
Volumetric Formula
Example: A box measuring 80 × 60 × 20 cm weighing 4 kg.
(80 × 60 × 20) ÷ 5,000 = 19.2 kg. You pay for 19.2 kg, not 4 kg.
Common Shipping Scenarios: Stone to KG
Typical real-world weights converted to familiar stone for easier planning.
| Scenario | Typical Weight | In Stone |
|---|---|---|
| Box of books (~25 items) | ~5 kg | 0 st 11 lb |
| Packed clothing suitcase | ~8–10 kg | 1 st 4 lb to 1 st 8 lb |
| Small kitchen appliance | ~10–14 kg | 1 st 8 lb to 2 st 3 lb |
| Moving house box (standard) | ~15–20 kg | 2 st 5 lb to 3 st 2 lb |
| Large furniture panel | 20–30 kg | 3 st 2 lb to 4 st 10 lb |
The Volumetric Trap for eBay & Etsy Sellers
If you sell lighter items such as lampshades, cushions or framed prints, your manual weight is secondary to the box size. A lampshade in a 40×40×40cm box weighs about 500g but has a volumetric weight of 12.8 kg. You will be charged for 12.8 kg.
The fix: Pack tightly, use the smallest box possible, and check our 10 kg in stone and 20 kg in stone guides to understand the pricing ceilings.
Frequently Asked Questions
What is 5 kg in stone for shipping?
5 kg is 0 stone 11.0 pounds, just under a full stone. At 5 kg you are typically in Royal Mail's medium parcel band for domestic UK shipping.
What does 10 kg parcel weigh in stone?
10 kg is 1 stone 8 pounds (1 st 8.0 lb exactly). In pounds it is 22 lbs. At 10 kg you are typically entering Parcelforce pricing territory or the upper end of Royal Mail medium.
What is volumetric weight and how do I calculate it?
Volumetric weight is the chargeable weight based on a parcel's size rather than its actual mass. The formula used by Parcelforce, DHL and FedEx is: Length × Width × Height (in cm) ÷ 5,000. Whichever is higher, your scale weight or the volumetric weight, is what you pay for.
What is the Royal Mail maximum parcel weight in stone?
Royal Mail's maximum is 20 kg, which is 3 stone 2 pounds (3 st 2.1 lb). Beyond 20 kg, parcels are handled by Parcelforce, which accepts up to 30 kg, approximately 4 stone 10 pounds (4 st 10.1 lb).
Do I need to declare weight in kg when shipping internationally?
Yes. All international shipping labels, customs declarations and courier bookings require weight in kilograms. Stone and pounds are not accepted by international carriers. Use the formula: kg = stone × 6.35029318 + pounds × 0.45359237, or use the converter at stonetokg.com.
StoneToKG.com: all conversions calculated using 1 stone = 6.35029318 kg exactly.
Need to weigh the parcel first? Guessing parcel weight is how you overpay postage or get parcels returned. See our best postal scales UK guide: 6 scales compared for letters, parcels and heavy items.
Dr Muhammad Usman
Dr Muhammad Usman graduated with his MBBS from Avicenna International Medical University in Bishkek, Kyrgyzstan (2019–2024).
He brings clinical training across general medicine, surgery, and public health, and writes the site's health information for UK readers in clear, practical language.