Stampulator - the Stamp Calculator https://stampulator.sroot.eu

About stampulator

This page calculates how many 1st/2nd class stamps you need for large letters and parcels.

Read my blog about why I created this here. When Royal Mail prices change please prompt me via a comment on my blog or messge me via Mastodon(https://mastodon.me.uk/@Sroot) and I'll update the calculations. thanks!

I was asked for a version that shows the stamps used to be below the target value. You can find that at https://stampulator.sroot.eu/underpaid.html

Royal Mail Online Pricing is sometimes different

If you're sending parcels, you might want to check Royal Mail online (also known as Click and Drop) pricing. They sometimes have discounts or offer free collections. https://www.royalmail.com/current-postage-prices currently links to both price lists. Example at the time of writing, the online price for a 10KG parcel is currently £7.39 and the stamp/over the counter price is £8.69

Printable page

I designed this page to be printable. It makes for a very long poster, useful for quick reference.

Which stamps do you have?

By default, it's assumed you have the standard UK 1st (£1.65p), 2nd (85p), Large 1st (£2.60p) and Large 2nd (£1.55p) which are are the Post Office price guide October 2024 prices from Royal Mail (link also includes size and weight limits). Alternatively, enter the values of the stamps you have here and press submit. If you don't need all 4 values use a high number like 9999 so it won't be suggested in the calculation. If you'd like a page for a different country or values comment on my blog and I'll see what I can do.


Results

Known limitations: Can only use up to 9 of each type of stamp (thus 36 stamps in total)

Your target values 165

UK Standard Services

Size Weight (up to) First Class Second Class
Letter 100g 165 85
Large Letter 100g 260 155
250g 350 210
500g 350 250
750g 350 270
Small Parcel 2kg 479 375
Medium Parcel 2kg 699 615
10kg 869 765
20kg 1319 1155

UK Signed for

Size Weight (up to) First Class Second Class
Letter 100g 335 255
Large Letter 100g 430 325
250g 520 380
500g 520 420
750g 520 440
Small Parcel 2kg 615 515
Medium Parcel 2kg 839 755
10kg 1009 905
20kg 1459 1295