The calculation, without hidden assumptions
Estimate the physical mass of a paper job from the definition of GSM: grams per square metre. Use a standard sheet preset or custom dimensions, then scale one-sheet mass to packs, reams and the complete print run.
How to use this calculator
Choose A5, A4, A3, Letter, Legal, Tabloid or Custom size.
Enter the stock grammage in GSM and sheets per pack or job unit.
Increase the pack count for cartons or multi-ream print runs; optionally add known wrapper/box mass per pack.
Read per-sheet, pack, 500-sheet ream, paper-only and packed totals, then inspect the substituted working before using the figure for logistics.
Where people use it
- •Estimate a print run before booking courier or freight.
- •Compare how changing GSM affects a brochure, report or handout shipment.
- •Check the theoretical weight of a ream or partial pack.
- •Estimate custom-size sheet mass for print production and purchasing.
500 A4 sheets at 80 GSM
A4 area is 0.210 × 0.297 = 0.06237 m². At 80 g/m² one sheet is 4.9896 g, so 500 sheets are 2,494.8 g, or about 2.495 kg before wrapper/box weight.
What the result does not assume
- •GSM is mass per unit area, not a direct measure of thickness, stiffness or opacity.
- •US basis-weight labels such as 20 lb Bond or 80 lb Cover depend on grade-specific basis sizes; do not treat the pound number as physical package weight.
- •For postage, freight, contractual or machine-load limits, weigh the finished packed job because coatings, moisture, ink/toner and manufacturing tolerance affect real mass.
Frequently asked questions
How much does one A4 80 GSM sheet weigh?+
A4 is 0.06237 m², so 0.06237 × 80 = 4.9896 g, about 4.99 g per sheet.
How much does a 500-sheet ream of A4 80 GSM paper weigh?+
The paper itself is about 2.495 kg. Wrapper and carton mass are additional.
Does higher GSM always mean thicker paper?+
No. GSM measures mass per square metre. Caliper/thickness also depends on fibre, coating, compression and stock construction.
Can I convert 20 lb or 80 lb paper directly to GSM?+
Only after identifying the US paper grade/basis size. Bond, Text, Cover and Index use different reference sheet sizes.
Can I use this total as courier chargeable weight?+
Use it as a planning estimate for actual mass, then weigh the finished parcel. Couriers can also apply volumetric/dimensional weight rules separately.
Semantic next steps
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