THE NUMBERS, EXPLAINED
How to use this calculator.
GSM is grams per square metre. Computes paper mass from flat sheet area and basis weight, excluding packaging, ink, moisture changes and coatings not included in the stated weight.
Start with your inputs
Enter sheet width (mm), sheet height (mm), paper weight (g/m²), sheets. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Sheet width (mm) | 210 |
| Sheet height (mm) | 297 |
| Paper weight (g/m²) | 80 |
| Sheets | 500 |
A worked example
With the example inputs above, mass per sheet (g) is 4.9896. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Mass per sheet (g) | 4.9896 |
| Total paper mass (kg) | 2.4948 |
How this is calculated
Mass per sheet (g)
Width × height in mm² ÷ 1,000,000 × grams per square metre.
Total paper mass (kg)
Mass per sheet × sheet count ÷ 1,000.
Symbols and units
- a
- Sheet width (mm)
- b
- Sheet height (mm)
- c
- Paper weight (g/m²)
- d
- Sheets
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
GSM is grams per square metre. Computes paper mass from flat sheet area and basis weight, excluding packaging, ink, moisture changes and coatings not included in the stated weight.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Mass per sheet (g); Total paper mass (kg). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: GSM is grams per square metre. Computes paper mass from flat sheet area and basis weight, excluding packaging, ink, moisture changes and coatings not included in the stated weight.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
PrintNinja: GSM means grams per square metre ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →