Envelope Sizing Calculator
Calculate envelope sizing with this free online tool
Envelope Sizing Calculator
Find the right envelope size for your card dimensions.
Standard Envelope Sizes
| Name | Width | Height | Fits Card Up To |
|---|---|---|---|
| A2 | 4.375" | 5.75" | 3.88" x 5.25" |
| A6 | 4.75" | 6.5" | 4.25" x 6.00" |
| A7 | 5.25" | 7.25" | 4.75" x 6.75" |
| A8 | 5.5" | 8.125" | 5.00" x 7.63" |
| A9 | 5.75" | 8.75" | 5.25" x 8.25" |
| A10 | 6" | 9.5" | 5.50" x 9.00" |
| #9 | 3.875" | 8.875" | 3.38" x 8.38" |
| #10 | 4.125" | 9.5" | 3.63" x 9.00" |
A free online envelope sizing calculator that works instantly in your browser. No registration, no limits — just enter your values and get results.
Key Features
No registration or account needed
Clean, ad-free interface
Instant envelope sizing calculator results
All processing happens in your browser
Free with unlimited use
Works on desktop, tablet, and mobile
Envelope Sizing Calculator
Enter Your Data
Input the required values or data into the tool fields
Adjust Settings
Configure any available options, units, or parameters
Run the Tool
Click the button to organize your input
Review Results
Read the output displayed on screen
Copy or Save
Copy the result to clipboard or save as needed
Use Cases
Learning and experimentation
On-the-go access from your phone or tablet
Comparing different inputs or scenarios
Quick tasks without specialized software
Frequently Asked Questions
How accurate are the results?
The tool uses standard formulas. For critical decisions, always verify independently.
Is my data safe?
All processing happens locally in your browser. No data is uploaded or stored.
Do I need to install anything?
No. The tool runs entirely in your web browser.
Can I use it offline?
Once loaded, most processing works without an internet connection.
Tool Information
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