Parcel Weight KG vs Stone
The UK Shipper's Complete Conversion Guide
UK courier tiers are defined in kilograms, but many of us think in stone. This guide converts every major tier for Royal Mail, Parcelforce, and DPD into stones and pounds.
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 every major UK and international shipping weight tier into stone and pounds, explains the 'volumetric weight' rule that catches thousands of UK senders out every year. 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're 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 — lampshades, cushions, 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 11 lbs, or just under 1 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 7.5 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 1.6 lb). Beyond 20 kg, parcels are handled by Parcelforce, which accepts up to 30 kg — approximately 4 stone 10 pounds (4 st 10.2 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.
Dr Muhammad Usman
MBBSDr Muhammad Usman graduated with his MBBS from Avicenna International Medical University in Bishkek, Kyrgyzstan (2019–2024) and brings international clinical training across general medicine, surgery, and public health. He writes all health content on this site to current NHS/WHO guidelines, ensuring clinical accuracy and real-world relevance for UK readers.
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