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 £7.65 and the stamp/over the counter price is £8.99

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 (£1.70p), 2nd (87p), Large 1st (£3.15p) 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 170

UK Standard Services

Size Weight (up to) First Class Second Class
Letter 100g 170 87
Large Letter 100g 315 155
250g 360 200
500g 360 240
750g 360 270
Small Parcel 2kg 499 390
Medium Parcel 2kg 719 629
10kg 899 789
20kg 1369 1189

UK Signed for

Size Weight (up to) First Class Second Class
Letter 100g 360 277
Large Letter 100g 505 345
250g 550 390
500g 550 430
750g 550 460
Small Parcel 2kg 649 540
Medium Parcel 2kg 869 779
10kg 1049 939
20kg 1519 1339