Paper density is a paper product's mass per unit volume. The density can be calculated by dividing the grammage of paper (in grams per square metre or "gsm") by its caliper (usually in micrometres, occasionally in mils).
- "Structural Characteristics of Paper" (PDF). Georgia Tech. Retrieved 2015-08-15.
- "ISO 534:2011(en) Paper and board — Determination of thickness, density and specific volume".