Cost to Mail a 100 lb Box – UK Rates Explained
Got a big box that weighs 100 lb and needs to go somewhere? You’re probably wondering how much it will cost and which service is best. Shipping a heavy parcel isn’t the same as sending a small envelope, so you’ll need to look at a few options and do a quick price check.
Royal Mail options for heavy parcels
Royal Mail’s standard parcels top out at 30 kg (about 66 lb). That means a 100 lb box can’t be sent as a regular parcel. If you still want to use the post office, you’ll have to split the box into smaller parcels that stay under the weight limit, or use the Royal Mail Business service called Parcelforce. Parcelforce offers a "Heavy Parcel" service that handles items up to 70 kg (about 154 lb). Prices are calculated by weight, size and speed. In 2025 a 100 lb (45 kg) box shipped with Parcelforce Express 48‑hour service costs roughly £150‑£180, while the slower economy option sits around £110‑£130. The cost includes basic tracking, but fuel surcharges and insurance add a few extra pounds.
Using couriers for a 100 lb box
Big couriers like UPS, DHL and FedEx also accept 100 lb packages. Their price calculators make it easy to get a quote online. Typical rates for a domestic UK shipment are:
- UPS Ground: £120‑£170, delivery in 2‑4 business days.
- DHL Express: £130‑£190, usually next‑day or two‑day service.
- FedEx UK Economy: £115‑£160, delivery in 3‑5 days.
All three add a fuel surcharge (around 5‑7% of the base price) and let you add insurance if the contents are valuable. If you have a business account, you can often shave 10‑15% off the listed rates.
One trick to lower the cost is to break the 100 lb box into two 50 lb parcels, if the items allow it. Two smaller parcels often qualify for cheaper tier pricing, and they’re easier for the carrier to handle. Just make sure each new box stays within the carrier’s size limits (most UK couriers allow up to 1.2 m in length and 0.8 m in width for a single parcel).
Another tip is to use a flat‑rate box if the carrier offers one. For example, Parcelforce has a Heavy Flat Rate Box that covers up to 70 lb for a set price of £99. If your box can fit, you’ll save a lot compared to per‑kg pricing.
Before you book, run a quick online quote for each provider. Enter the exact weight, dimensions and destination to see the final amount. Many sites also show extra services like signature on delivery or weekend collection, which can add a few pounds.
In short, expect to pay between £110 and £200 to move a 100 lb box across the UK, depending on speed and carrier. Compare the big three couriers, check Parcelforce’s heavy‑parcel rates, and consider splitting the load if you want the lowest price. With a few quick checks you’ll know exactly what you’re paying and can choose the best option for your budget.
April 14, 2025
Evelyn Wescott
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Figuring out the cost to mail a 100 lb box internationally can feel like a treasure hunt with no map. Factors such as destination, shipping method, and carrier choices significantly influence the overall cost. From understanding how carriers calculate their rates to tips on saving a few bucks, this guide provides a clear path through the often confusing world of international shipping. Let's untangle the complexities and make sense of international shipping costs without the stress.
