Papyrus360

Tools

Paper Industry Calculators

Eight free calculators covering everything from GSM conversions and ream weights to roll lengths and per-sheet pricing. Bookmark this page — your daily paper maths, done in seconds.

GSMBasis WeightReam WeightRoll WeightRoll LengthCaliperSheet CountPrice

Need a custom calculator or formula? Tell us and we'll add it.

Reference Pages

Paper Glossary

63 industry terms — GSM, bulk, kappa, freeness, deckle and more.

Paper Grades Guide

Compare newsprint, LWC, art, kraft, duplex, tissue — GSM, brightness, opacity.

Testing Standards

BIS (IS), ISO, and TAPPI standards for paper and board quality testing.

Weight & Grammage

GSM calculations and international paper weight conversions

GSM Calculator

Calculate GSM from sheet dimensions and weight, or find sheet weight from GSM.

mm
mm
g

Basis Weight ↔ GSM

Convert US basis weight to metric GSM or vice versa across all paper grades.

lb

Ream Weight Calculator

Find the weight of a ream given GSM, sheet size, and number of sheets.

g/m²
mm
mm

Roll Calculations

Weight and length calculations for paper rolls

Roll Weight Calculator

Calculate gross weight of a paper roll from GSM, width, and length.

g/m²
mm
m

Roll Length Calculator

Find paper length on a roll from weight & GSM, or from outer/core diameter and caliper.

g/m²
mm
kg

Thickness & Dimensions

Caliper and thickness unit conversions

Caliper / Thickness Converter

Convert paper thickness between microns, mils, millimetres, and points.

Bulk Calculator

Calculate paper bulk (cm³/g) and book thickness from caliper and GSM. Critical for book designers and printers.

μm
g/m²

Bulk = Caliper (μm) ÷ GSM

Quantity & Pricing

Sheet counts and price breakdowns from bulk orders

Sheets from Weight

Calculate how many sheets are in a given weight for a specific paper size and GSM.

kg
g/m²
mm
mm

Price Converter

Convert paper price from per metric ton to per ream and per sheet.

INR
g/m²
mm
mm

Production & Efficiency

Machine output and moisture-adjusted weights

Moisture Correction

Adjust paper weight from actual moisture content to standard (trade) moisture. Standard is typically 10% for India trade.

kg
%
%

Production Rate Calculator

Calculate paper machine output from machine speed, trim width, GSM, and operating efficiency.

m/min
mm
g/m²
%

Standard Paper Sizes

ISO A/B/C, SRA/RA, US ANSI, and Indian traditional sizes with mm and inch equivalents

Standard Paper Sizes

ISO A/B/C, SRA, US ANSI, and Indian traditional sizes with mm and inch dimensions.

SizeWidth (mm)Height (mm)Width (in)Height (in)
ISO A Series
A0841118933.11"46.81"
A159484123.39"33.11"
A242059416.54"23.39"
A329742011.69"16.54"
A42102978.27"11.69"
A51482105.83"8.27"
A61051484.13"5.83"
A7741052.91"4.13"
A852742.05"2.91"
A937521.46"2.05"
A1026371.02"1.46"
ISO B Series
B01000141439.37"55.67"
B1707100027.83"39.37"
B250070719.69"27.83"
B335350013.90"19.69"
B42503539.84"13.90"
B51762506.93"9.84"
B61251764.92"6.93"
B7881253.46"4.92"
B862882.44"3.46"
ISO C Series (Envelopes)
C0917129736.10"51.06"
C164891725.51"36.10"
C245864818.03"25.51"
C332445812.76"18.03"
C42293249.02"12.76"
C51622296.38"9.02"
C61141624.49"6.38"
C7811143.19"4.49"
SRA Series (Bleed printing)
SRA0900128035.43"50.39"
SRA164090025.20"35.43"
SRA245064017.72"25.20"
SRA332045012.60"17.72"
SRA42253208.86"12.60"
RA0860122033.86"48.03"
RA161086024.02"33.86"
RA243061016.93"24.02"
US / ANSI Sizes
Letter2162798.50"10.98"
Legal2163568.50"14.02"
Tabloid27943210.98"17.01"
Executive1842677.24"10.51"
Statement1402165.51"8.50"
ANSI C43255917.01"22.01"
ANSI D55986422.01"34.02"
Indian / Traditional Sizes
Crown38150815.00"20.00"
Demy44557217.52"22.52"
Medium45758417.99"22.99"
Royal50863520.00"25.00"
Super Royal52168620.51"27.01"
Foolscap34343213.50"17.01"
Elephant58471122.99"27.99"

Automate these calculations

Let the ERP do
the maths.

Papyrus360 BPApp handles GSM tracking, roll inventory, and pricing automatically — no manual conversion needed.

See BPAppEmail us directly
EmailGet in Touch