Private production calculator
Paper Weight Converter
Compare GSM with US paper basis weights. Results update instantly.
More file tasks
Understand paper weight measurements, convert between GSM and pounds, and choose the right paper for your printing needs with confidence.
How it works
A useful answer,
with the math visible.
Convert common text, cover, bond and Bristol paper basis weights into an approximate GSM value. Adjust the fields above and the result updates immediately—there is no upload, account or hidden processing step.
Worked example
80 lb text is approximately 118 GSM, while 80 lb cover is approximately 216 GSM.
How to use the Paper Weight Converter
- Select whether you're converting from basis weight (lb) or metric weight (GSM).
- Choose your paper grade from the dropdown menu.
- Enter your weight value in the appropriate field.
- Review the converted value in both measurement systems.
- Use the results to compare paper specifications across regions.
What happens under the hood
This calculator uses grade-specific conversion factors to translate between US basis weights and metric GSM. Text paper uses a factor of 1.48, cover paper 2.7, bond paper 3.76, and Bristol paper 2.19. The conversion runs instantly in your browser using simple multiplication and division, with no data sent to external servers. Results are rounded to whole numbers for practical purchasing decisions.
Before you send the file
- A pound value means different things for different paper grades because base sheet sizes differ.
- This is a purchasing estimate, not a laboratory measurement of a specific stock.
- Confirm caliper, opacity and finish separately with the paper supplier.
Frequently asked questions
What is basis weight vs GSM?
Basis weight measures the weight of 500 sheets in pounds, while GSM (grams per square meter) measures weight per area. GSM is more consistent across paper types and is the standard in most countries outside the US.
Why do different paper grades use different conversion factors?
Basis weight is based on different base sheet sizes for each grade. Text paper uses 17×22 inches, while cover uses 20×26 inches, making direct comparison impossible without conversion.
Is this conversion accurate for all paper types?
This provides approximate values for common grades. For specialty papers or exact specifications, consult your paper supplier. The conversion factors are industry standards but may vary slightly by manufacturer.
How do I choose the right paper weight?
Consider your project needs: text paper (60-100 lb) for books and flyers, cover (65-120 lb) for postcards and brochures, and bond (20-24 lb) for everyday printing. Heavier weights feel more substantial but cost more.
This calculator is a planning aid. Materials, equipment and supplier tolerances vary, so verify final specifications with the printer or carrier responsible for production.