Paper weight and sheets calculator
Ream mass from sheet size, grammage and sheet count.
Fill in the fields and the result will appear here automatically.
Grammage is mass per area in g/m². This calculator uses the nominal whole-millimetre A 0–A 6 dimensions in the ISO 216 table: A 4 is 210×297mm. That sheet has area 0.06237m²; at 80g/m² it weighs 4.9896g, and 500 sheets give 2.4948kg, displayed as 2.495kg. The estimate excludes packaging; actual mass depends on the dimensions, actual grammage and storage conditions.
How it works
Formula and logic
Area = width × height /1,000,000 in m²; ream mass = area × g/m² × sheets /1000 in kg. The A-series design halves area while retaining aspect ratio; ideal A 0 has area 1m², but table dimensions round to whole millimetres, so this calculator does not use exactly 1/16m² for A 4. Grammage must be positive and sheet count an integer from 1 to 9,007,199,254,740,991. Masses and the inverse sheet count round only for display; the inverse may be fractional. Numeric range limits are marked separately.
Example
A 4:210×297mm ×80g/m² ×500 sheets =2.4948kg, displayed as 2.495kg without packaging.
Fields and units
- Sheet size — list option
- Grammage — g/m²
- Sheets — unitless
How to use
- — Choose an available A 0–A 6 size; this form does not accept custom dimensions.
- — Enter the manufacturer’s grammage in g/m² and a positive whole sheet count.
- — Read the estimated mass without wrapping. Weigh the finished parcel for shipping; check printer compatibility in its manual.
Method and limitations
- Calculation method
- Formula and logic
- Data or methodology source
- ISO216:2007, §6.1 table1: nominal A0–A6 dimensions; ideal area differs from rounded dimensions
- Limitation
- Paper mass excludes the envelope, box, glue and other contents. Weigh the finished parcel before selecting postage: the nominal estimate does not guarantee staying below a weight threshold.
FAQ
Why is A 4 slightly below 2.5kg?
Nominal 210×297mm gives 0.06237m² rather than exactly 1/16m². Thus 500 sheets at 80g/m² give 2.4948kg; at 64g/m² they give 1.99584kg. A rounded estimate does not replace weighing.
Are grammage and thickness the same?
No. Grams per square metre specify mass per area; thickness depends on material and structure. This input alone does not determine thickness or printer suitability.
What counts for a parcel?
Paper mass excludes the envelope, box, glue and other contents. Weigh the finished parcel before selecting postage: the nominal estimate does not guarantee staying below a weight threshold.
What does sheets per kilogram mean?
It is 1000g divided by estimated sheet mass. The answer may be fractional; it is a theoretical ratio rather than a whole sheet count producing exactly one kilogram.