Find the Perfect Envelope in Seconds
Not sure which envelope size you need? Our Perfect Envelope Calculator takes the guesswork out of choosing the right envelope.
Simply enter the width and height of your card, invitation, document or artwork in millimetres (mm), and we'll instantly recommend the most suitable envelope from our Karma Krafts range.
Whether you're creating wedding invitations, sending greeting cards, posting important documents or working on a craft project, our calculator helps you find the perfect fit quickly and accurately.
How to Use the Calculator
- Measure the width of your card or document in millimetres (mm).
- Measure the height in millimetres (mm).
- Enter both measurements into the calculator.
- We'll recommend the best envelope size for your item.
Why Use Our Calculator?
✓ Instantly find the correct envelope size
✓ Avoid ordering the wrong envelopes
✓ Perfect for cards, invitations, certificates and documents
✓ Uses standard UK envelope sizes
✓ Quick, simple and completely free to use
Need More Help?
If you're still unsure which envelope is right for your project, visit our Envelope Size Guide for detailed measurements, compatibility information, helpful illustrations and answers to frequently asked questions about every envelope size.