Private production calculator
Poster Resolution Calculator
Choose sensible resolution for large-format artwork. Results update instantly.
More file tasks
Choose a sensible poster resolution using print size, viewing distance, source quality and printer requirements instead of a universal 300 PPI rule.
How it works
A useful answer,
with the math visible.
Calculate the pixel dimensions and approximate uncompressed file size for posters, signs and banners. Adjust the fields above and the result updates immediately—there is no upload, account or hidden processing step.
Worked example
A 24 × 36 in poster at 150 PPI requires 3600 × 5400 px, or 19.44 megapixels.
How to use the Poster Resolution Calculator
- Enter your poster width and height in inches.
- Select your target resolution from the dropdown menu.
- Review the required pixel dimensions for your poster.
- Check the megapixel count and uncompressed file size estimate.
- Adjust resolution based on viewing distance and print quality needs.
What happens under the hood
This calculator multiplies your poster dimensions by the selected PPI to determine required pixel count, then calculates megapixels by dividing total pixels by 1,000,000. The uncompressed file size estimate assumes 3 bytes per pixel (RGB) and divides by 1,000,000. All calculations happen instantly in your browser, with no data sent to external servers. You can choose lower resolutions for distant viewing or higher resolutions for close inspection.
Before you send the file
- Large-format work is often viewed farther away and may not require 300 PPI.
- The file-size estimate is uncompressed RGB data; saved files are usually smaller.
- Ask the printer for effective-resolution and maximum-file-size requirements.
Frequently asked questions
What resolution do I need for a poster?
Viewing distance matters. For posters viewed from 10+ feet, 100-150 PPI is sufficient. For close viewing (within 3 feet), use 200-300 PPI. This tool helps you balance quality and file size.
Why is the file size estimate so large?
The estimate shows uncompressed RGB data (3 bytes per pixel). Actual saved files are smaller due to compression. JPEGs typically reduce file size by 80-90% while maintaining good quality.
Can I use this for billboard-sized prints?
Yes, but billboards often use very low resolutions (30-50 PPI) since they're viewed from great distances. This tool helps you choose appropriate resolution for your specific viewing conditions.
What's the difference between PPI and DPI for large format?
PPI refers to image resolution, while DPI refers to printer output. For large format, printers may use different DPI settings. Focus on PPI for image quality—most large format printers work well with 100-150 PPI.
This calculator is a planning aid. Materials, equipment and supplier tolerances vary, so verify final specifications with the printer or carrier responsible for production.