1739:
1749:
292:
is usually 500 sheets. However, the mass specified is not the mass of the ream that is sold to the customer. Instead, it is the mass of the uncut "basis ream" in which the sheets have some larger size (parent size). Often, that is a size used during the manufacturing process before the paper is cut
323:
However, a sheet of common copy paper that has a basis weight of 20 pounds (9.1 kg) does not have the same mass as the same size sheet of coarse paper (newsprint). In the former case, the standard ream is 500 sheets of 17-by-22-inch (432 by 559 mm) paper, and in the latter, 500 sheets of
307:
The standard dimensions and sheet count of a ream vary according to the type of paper. These "uncut" basis sizes are not normally labelled on the product, are not formally standardized, and therefore have to be guessed or inferred somehow from trading practice. Historically, this convention is the
227:
643:
Early newsprint presses printed sheets 2 by 3 feet (610 by 914 mm) in size, and so the ream dimensions for newsprint became 24 by 36 inches (610 by 914 mm), with 500 sheets to a ream. Newsprint was made from ground wood pulp, and ground wood hanging paper
680:-by-11-inch (216 by 279 mm) copy paper may be specified "10 M". 1000 cut sheets (or two reams) will weigh 10 lb (4.5 kg), half of the four reams of cut paper resulting from the 20# basis ream of 17-by-22-inch (432 by 559 mm) paper.
696:. However, paper thickness for most typical business papers might be similar across comparable brands. If thickness is not specified for a paper in question, it must be either measured or guessed based on a comparable paper's specification.
663:). The M weight is the weight (in pounds) of 1000 cut sheets. Paper suppliers will often charge by M weight, since it is always consistent within a specific paper size, and because it allows a simple weight calculation for shipping charges.
311:
By using the same basis sheet size for the same type of paper, consumers can easily compare papers of differing brands. Twenty-pound bond paper is always lighter and thinner than 32-pound bond, no matter what its cut size, and 20-pound bond
648:) was made on newsprint machines. Newsprint was used as wrapping paper, and the first paper bags were made from newsprint. The newsprint ream standard also became the standard for packaging papers, even though in packaging papers
144:
659:" symbol. For example, "20#" means "20 pounds per basis ream of that kind of paper". When the density of a ream of paper is given in pounds, it is often accompanied by its "M weight" (M is 1000 in
258:
692:
is typically not directly known or specified, the thickness of any sheet of paper cannot be calculated by any method. Instead, it is measured and specified separately as its
604:. So, the 17-by-22-inch (432 by 559 mm) ream became commonly used. The 25-by-38-inch (635 by 965 mm) book-paper ream developed because such a size can easily be
823:
1649:
222:{\displaystyle {\text{grammage}}={\frac {{\text{mass}}{\text{ (g)}}}{{\text{length}}{\text{ }}({\text{m}})\times {\text{width}}{\text{ }}({\text{m}})}}}
246:
of a square metre) weighs 5 g (0.18 oz). The abbreviation "gsm" instead of the standard "g/m" symbol is also widely encountered in
324:
24-by-36-inch (610 by 914 mm) paper. Here are some basic ream sizes for various types of paper. Units are inches except where noted.
277:
is used in addition to or instead of grammage. The basis weight of paper is the density of paper expressed in terms of the mass of a
1634:
1629:
1644:
1639:
948:
861:
688:
Paper thickness, or caliper, is a common measurement specified and required for certain printing applications. Since a paper's
836:
99:
of 500 (or in some cases 1000) sheets of a given (raw, still uncut) basis size. Japanese paper is expressed as the weight in
80:). This is the measure used in most parts of the world. It is often notated as gsm on paper product labels and spec sheets.
1563:
911:
1214:
1510:
1431:
901:
247:
733:
1112:
1042:
1624:
1558:
1515:
45:
1538:
729:
1457:
1182:
1067:
797:
704:
91:. The convention used in the United States and a few other countries using US-standard paper sizes is
1326:
600:-by-11-inch (216 by 279 mm) sheets, a standard for business stationery known conventionally as
1661:
941:
921:
1321:
1177:
1167:
282:
1689:
1752:
1780:
1234:
1219:
1077:
968:
802:
749:
1714:
1573:
1411:
1189:
982:
880:"ISO 534:2011(en) Paper and board — Determination of thickness, density and specific volume"
127:
1724:
1608:
1593:
1548:
1467:
1421:
1391:
1331:
1316:
1157:
1097:
1047:
995:
990:
741:
131:
1775:
1742:
1699:
1386:
1351:
1199:
1127:
1102:
1037:
934:
771:
660:
293:
to the dimensions in which it is sold. So, to compute the mass per area, one must know
116:, the mass per unit area of all types of paper and paperboard is expressed in terms of
1769:
1588:
1578:
1495:
1381:
1371:
1341:
1306:
1269:
1204:
1172:
1137:
905:
781:
725:
649:
285:
113:
17:
865:
721:
ranges between roughly 97 and 114 ÎĽm (0.0038 and 0.0045 in) in thickness.
281:
of given dimensions and a sheet count. In the US system, the weight is specified in
232:
Typical office paper has 80 g/m (0.26 oz/sq ft), therefore a typical
1704:
1603:
1520:
1477:
1376:
1286:
1259:
1254:
1249:
1194:
1162:
1142:
1117:
766:
92:
73:
49:
896:
1719:
1684:
1679:
1598:
1568:
1361:
1346:
1291:
1281:
1264:
1244:
1229:
1209:
1122:
1072:
972:
700:
656:
31:
879:
1656:
1583:
1505:
1462:
1436:
1426:
1356:
1336:
1311:
1276:
1239:
1152:
1132:
792:
786:
737:
718:
605:
335:
289:
278:
270:
254:
96:
84:
822:
International
Standard ISO 536: Paper and board – Determination of grammage.
1694:
1452:
1416:
1396:
1366:
1301:
1296:
1147:
645:
609:
122:
1709:
1553:
1543:
1224:
233:
134:, though printers in most English-speaking countries still refer to the "
100:
1472:
1017:
1011:
761:
693:
689:
308:
product of pragmatic considerations such as the size of a sheet mold.
135:
1487:
1406:
1401:
1107:
957:
745:
83:
Expressed in terms of the mass per number of sheets of a specific
53:
586:
Sheets 17 by 22 inches (432 by 559 mm) can be cut into four
30:"Paper weight" redirects here. For the heavy desktop object, see
69:
61:
57:
930:
652:
pulp, rather than ground wood, was used for greater strength.
320:
papers are the same weight paper with a different cut size.
732:
the grammage over the caliper, and is usually expressed in
916:
640:-inch (159 by 241 mm) before trimming and binding).
926:
147:
64:. Two ways of expressing grammage are commonly used:
1672:
1617:
1529:
1486:
1445:
1090:
1060:
1030:
1004:
981:
221:
303:the dimensions of an "uncut" sheet in that ream.
120:(g/m or gsm). This quantity is commonly called
824:International Organization for Standardization
942:
717: in = 25.4 ÎĽm). Commonly, 20-pound
8:
655:Paper weight is sometimes stated using the "
612:sheets without significant waste (nominally
1057:
1027:
1001:
949:
935:
927:
208:
200:
195:
184:
176:
171:
164:
159:
156:
148:
146:
328:
261:and verified by laboratory measurement.
815:
703:(ÎĽm), or in the United States also in
300:the number of sheets in that ream, and
666:For example, a 500-sheet ream of 20#
273:, a less verifiable measure known as
7:
1748:
76:(g/m), regardless of its thickness (
922:Paper Weight Conversion GSM to LBS
253:Typically grammage is measured in
27:The mass per unit of area of paper
25:
864:. 22 October 2012. Archived from
608:6-by-9-inch (152 by 229 mm)
1747:
1738:
1737:
699:Caliper is usually measured in
213:
205:
189:
181:
1:
1564:Environmental impact of paper
77:
897:Understanding Paper Weights
297:the mass of the basis ream,
1797:
1511:Surface chemistry of paper
1014:(Zuo Bo/Tso Po/Tso TzÇ”-yi)
902:Understanding paper weight
740:the mathematical need for
734:grams per cubic centimetre
498:Hanging, waxing, bag, etc.
248:English-speaking countries
29:
1733:
964:
334:
288:and the sheet count of a
1043:Friedrich Gottlob Keller
1559:Elemental chlorine free
1516:Units of paper quantity
917:Paper Weight Calculator
1539:Bleaching of wood pulp
565:Paperboard (all types)
269:In countries that use
259:quality control system
223:
118:grams per square metre
103:(kg) per 1,000 sheets.
56:product, that is, its
1458:Corrugated fiberboard
1215:Electrical insulation
1068:Thomas Francis Carter
798:Paper and ink testing
347:Bond, writing, ledger
224:
18:Basis weight of paper
789:— filing holes
271:American paper sizes
145:
912:M-weight Calculator
868:on 22 October 2012.
862:"Paper Comparisons"
748:and micrometres (a
602:letter sized paper
512:Book, text, offset
316:and 20-pound bond
219:
48:industry, are the
1761:
1760:
1086:
1085:
1078:Tsien Tsuen-hsuin
1056:
1055:
1026:
1025:
969:Paper engineering
803:Photo print sizes
750:conversion factor
728:is calculated by
582:
581:
217:
211:
203:
198:
187:
179:
174:
167:
162:
151:
16:(Redirected from
1788:
1751:
1750:
1741:
1740:
1725:Beverage cartons
1715:Watercolor paper
1574:Hollander beater
1058:
1028:
1002:
951:
944:
937:
928:
884:
883:
876:
870:
869:
858:
852:
851:
849:
847:
833:
827:
820:
742:unit conversions
716:
715:
711:
679:
678:
674:
671:
639:
638:
634:
631:
625:
624:
620:
617:
606:cut into sixteen
599:
598:
594:
591:
577:
557:
556:
552:
549:
541:
540:
536:
533:
462:
461:
457:
454:
446:
445:
441:
438:
361:Manuscript cover
342:Sheets per ream
329:
245:
244:
240:
228:
226:
225:
220:
218:
216:
212:
209:
204:
201:
199:
196:
188:
185:
180:
177:
175:
172:
169:
168:
165:
163:
160:
157:
152:
149:
21:
1796:
1795:
1791:
1790:
1789:
1787:
1786:
1785:
1766:
1765:
1762:
1757:
1729:
1668:
1613:
1609:Sulfite process
1594:Paper recycling
1549:Conical refiner
1531:
1525:
1482:
1468:Paper chemicals
1441:
1082:
1052:
1048:Charles Fenerty
1022:
1000:
996:Missal of Silos
991:Battle of Talas
977:
960:
955:
893:
888:
887:
878:
877:
873:
860:
859:
855:
845:
843:
835:
834:
830:
821:
817:
812:
807:
758:
752:of 1,000,000).
713:
709:
708:
686:
676:
672:
669:
667:
636:
632:
629:
627:
622:
618:
615:
613:
596:
592:
589:
587:
575:
554:
550:
547:
545:
538:
534:
531:
529:
459:
455:
452:
450:
443:
439:
436:
434:
431:Bristol and tag
338:
267:
242:
238:
237:
170:
158:
143:
142:
110:
35:
28:
23:
22:
15:
12:
11:
5:
1794:
1792:
1784:
1783:
1778:
1768:
1767:
1759:
1758:
1756:
1755:
1745:
1734:
1731:
1730:
1728:
1727:
1722:
1717:
1712:
1707:
1702:
1697:
1692:
1687:
1682:
1676:
1674:
1670:
1669:
1667:
1666:
1665:
1664:
1654:
1653:
1652:
1647:
1642:
1637:
1632:
1625:Paper industry
1621:
1619:
1615:
1614:
1612:
1611:
1606:
1601:
1596:
1591:
1586:
1581:
1576:
1571:
1569:Handmade paper
1566:
1561:
1556:
1551:
1546:
1541:
1535:
1533:
1527:
1526:
1524:
1523:
1518:
1513:
1508:
1503:
1498:
1492:
1490:
1488:Specifications
1484:
1483:
1481:
1480:
1475:
1470:
1465:
1460:
1455:
1449:
1447:
1443:
1442:
1440:
1439:
1434:
1429:
1424:
1419:
1414:
1409:
1404:
1399:
1394:
1389:
1384:
1379:
1374:
1369:
1364:
1359:
1354:
1349:
1344:
1339:
1334:
1329:
1327:Plastic-coated
1324:
1319:
1314:
1309:
1304:
1299:
1294:
1289:
1284:
1279:
1274:
1273:
1272:
1262:
1257:
1252:
1247:
1242:
1237:
1232:
1227:
1222:
1217:
1212:
1207:
1202:
1197:
1192:
1187:
1186:
1185:
1175:
1170:
1165:
1160:
1155:
1150:
1145:
1140:
1135:
1130:
1125:
1120:
1115:
1110:
1105:
1100:
1094:
1092:
1088:
1087:
1084:
1083:
1081:
1080:
1075:
1070:
1064:
1062:
1054:
1053:
1051:
1050:
1045:
1040:
1038:Matthias Koops
1034:
1032:
1024:
1023:
1021:
1020:
1015:
1008:
1006:
999:
998:
993:
987:
985:
979:
978:
976:
975:
965:
962:
961:
956:
954:
953:
946:
939:
931:
925:
924:
919:
914:
909:
899:
892:
891:External links
889:
886:
885:
871:
853:
837:"ISO 536:2019"
828:
814:
813:
811:
808:
806:
805:
800:
795:
790:
784:
778:
777:
776:
775:
774:
772:Linear density
769:
757:
754:
707:(1 mil =
685:
682:
661:Roman numerals
584:
583:
580:
579:
572:
569:
566:
562:
561:
558:
542:
527:
523:
522:
519:
516:
513:
509:
508:
505:
502:
499:
495:
494:
491:
488:
485:
481:
480:
477:
474:
471:
467:
466:
463:
447:
432:
428:
427:
424:
421:
418:
414:
413:
410:
407:
404:
400:
399:
396:
393:
390:
386:
385:
382:
379:
376:
372:
371:
368:
365:
362:
358:
357:
354:
351:
348:
344:
343:
340:
333:
305:
304:
301:
298:
266:
263:
230:
229:
215:
207:
194:
191:
183:
155:
109:
106:
105:
104:
81:
46:pulp and paper
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
1793:
1782:
1779:
1777:
1774:
1773:
1771:
1764:
1754:
1746:
1744:
1736:
1735:
1732:
1726:
1723:
1721:
1718:
1716:
1713:
1711:
1708:
1706:
1703:
1701:
1698:
1696:
1693:
1691:
1688:
1686:
1683:
1681:
1678:
1677:
1675:
1671:
1663:
1660:
1659:
1658:
1655:
1651:
1650:United States
1648:
1646:
1643:
1641:
1638:
1636:
1633:
1631:
1628:
1627:
1626:
1623:
1622:
1620:
1616:
1610:
1607:
1605:
1602:
1600:
1597:
1595:
1592:
1590:
1589:Paper machine
1587:
1585:
1582:
1580:
1579:Kraft process
1577:
1575:
1572:
1570:
1567:
1565:
1562:
1560:
1557:
1555:
1552:
1550:
1547:
1545:
1542:
1540:
1537:
1536:
1534:
1528:
1522:
1519:
1517:
1514:
1512:
1509:
1507:
1504:
1502:
1499:
1497:
1494:
1493:
1491:
1489:
1485:
1479:
1476:
1474:
1471:
1469:
1466:
1464:
1461:
1459:
1456:
1454:
1451:
1450:
1448:
1444:
1438:
1435:
1433:
1430:
1428:
1425:
1423:
1420:
1418:
1415:
1413:
1410:
1408:
1405:
1403:
1400:
1398:
1395:
1393:
1390:
1388:
1385:
1383:
1380:
1378:
1375:
1373:
1370:
1368:
1365:
1363:
1360:
1358:
1355:
1353:
1350:
1348:
1345:
1343:
1340:
1338:
1335:
1333:
1330:
1328:
1325:
1323:
1320:
1318:
1315:
1313:
1310:
1308:
1305:
1303:
1300:
1298:
1295:
1293:
1290:
1288:
1285:
1283:
1280:
1278:
1275:
1271:
1268:
1267:
1266:
1263:
1261:
1258:
1256:
1253:
1251:
1248:
1246:
1243:
1241:
1238:
1236:
1233:
1231:
1228:
1226:
1223:
1221:
1218:
1216:
1213:
1211:
1208:
1206:
1203:
1201:
1198:
1196:
1193:
1191:
1188:
1184:
1181:
1180:
1179:
1176:
1174:
1171:
1169:
1166:
1164:
1161:
1159:
1156:
1154:
1151:
1149:
1146:
1144:
1141:
1139:
1136:
1134:
1131:
1129:
1126:
1124:
1121:
1119:
1116:
1114:
1111:
1109:
1106:
1104:
1101:
1099:
1096:
1095:
1093:
1089:
1079:
1076:
1074:
1071:
1069:
1066:
1065:
1063:
1059:
1049:
1046:
1044:
1041:
1039:
1036:
1035:
1033:
1029:
1019:
1016:
1013:
1010:
1009:
1007:
1003:
997:
994:
992:
989:
988:
986:
984:
980:
974:
970:
967:
966:
963:
959:
952:
947:
945:
940:
938:
933:
932:
929:
923:
920:
918:
915:
913:
910:
907:
906:Staples, Inc.
903:
900:
898:
895:
894:
890:
881:
875:
872:
867:
863:
857:
854:
842:
838:
832:
829:
825:
819:
816:
809:
804:
801:
799:
796:
794:
791:
788:
785:
783:
782:Envelope size
780:
779:
773:
770:
768:
765:
764:
763:
760:
759:
755:
753:
751:
747:
743:
739:
735:
731:
727:
726:paper density
722:
720:
706:
702:
697:
695:
691:
683:
681:
664:
662:
658:
653:
651:
647:
641:
611:
607:
603:
573:
570:
567:
564:
563:
559:
543:
528:
526:Index bristol
525:
524:
520:
517:
514:
511:
510:
506:
503:
500:
497:
496:
492:
489:
486:
483:
482:
478:
475:
472:
469:
468:
464:
448:
433:
430:
429:
425:
422:
419:
416:
415:
411:
408:
405:
402:
401:
397:
394:
391:
388:
387:
383:
380:
377:
374:
373:
369:
366:
363:
360:
359:
355:
352:
349:
346:
345:
341:
337:
331:
330:
327:
326:
325:
321:
319:
315:
309:
302:
299:
296:
295:
294:
291:
287:
284:
280:
276:
272:
264:
262:
260:
257:on-line by a
256:
251:
249:
235:
192:
153:
141:
140:
139:
137:
133:
129:
125:
124:
119:
115:
114:metric system
107:
102:
98:
94:
90:
86:
82:
79:
75:
71:
68:Expressed in
67:
66:
65:
63:
59:
55:
51:
47:
43:
39:
33:
19:
1763:
1690:Papier-mâché
1685:Paper towels
1604:Soda pulping
1521:Wet strength
1500:
1322:Photographic
1195:Cotton (rag)
1168:Construction
874:
866:the original
856:
844:. Retrieved
840:
831:
818:
767:Area density
723:
698:
687:
665:
654:
642:
601:
585:
412:500 or 1000
322:
317:
313:
310:
306:
275:basis weight
274:
268:
265:Basis weight
252:
231:
138:" of paper.
121:
117:
111:
89:basis weight
88:
74:square metre
60:per unit of
50:area density
42:basis weight
41:
37:
36:
1720:Paper money
1680:Lined paper
1599:Papermaking
1532:and process
1530:Manufacture
1506:Paper sizes
1235:Greaseproof
1220:GenkĹŤ yĹŤshi
1073:Dard Hunter
1005:Originators
973:Papermaking
701:micrometres
332:Paper type
314:letter size
283:avoirdupois
95:(lb) per a
87:, known as
32:paperweight
1770:Categories
1657:Paper mill
1584:Organosolv
1463:Fiber crop
1453:China clay
1412:Waterproof
1312:Paperboard
1190:Correction
1183:Carbonless
1031:Developers
810:References
793:Index card
787:Hole punch
738:cancel out
736:(g/cm) to
719:bond paper
610:book sized
578:per ream)
576:1000 sq ft
417:Watercolor
336:Paper size
318:legal size
290:paper ream
255:paper mill
85:paper size
1710:Notebooks
1695:Cardboard
1478:Wood pulp
1446:Materials
1422:Wood-free
1397:Wallpaper
1392:Tree-free
1332:Red rosin
1317:Parchment
1302:Onionskin
1297:Newsprint
1158:Cartridge
1153:Cardstock
1148:Cardboard
1098:Acid-free
846:5 October
826:, Geneva.
646:wallpaper
484:Newsprint
389:Box cover
339:(inches)
193:×
166: (g)
101:kilograms
44:, in the
1781:Printing
1743:Category
1700:Clothing
1618:Industry
1554:Deinking
1544:Calender
1501:Grammage
1387:Transfer
1352:Security
1225:Glassine
1128:Blotting
1103:Air-laid
1061:Scholars
756:See also
744:between
730:dividing
375:Blotting
150:grammage
126:in both
123:grammage
108:Grammage
72:(g) per
38:Grammage
1753:Commons
1705:Tissues
1496:Density
1473:Papyrus
1432:Writing
1382:Tracing
1372:Thermal
1347:Scritta
1342:Rolling
1307:Origami
1270:Butcher
1205:Display
1173:Contact
1138:Bristol
1113:Asphalt
1018:Damjing
1012:Cai Lun
983:History
762:Density
712:⁄
694:caliper
690:density
684:Caliper
675:⁄
635:⁄
621:⁄
595:⁄
553:⁄
537:⁄
458:⁄
442:⁄
241:⁄
236:sheet (
128:English
112:In the
78:caliper
1635:Europe
1630:Canada
1377:Tissue
1287:Manila
1260:Korean
1255:Ingres
1250:Inkjet
1163:Coated
1143:Carbon
1118:Banana
746:metres
574:1000 (
470:Tissue
286:pounds
202:
178:
173:length
136:weight
132:French
93:pounds
1776:Paper
1645:Japan
1640:India
1407:Wasli
1402:Washi
1362:Stone
1292:Mummy
1282:Lokta
1265:Kraft
1245:India
1230:Graph
1200:CrĂŞpe
1123:Bible
1108:Amate
1091:Types
958:Paper
650:kraft
403:Cover
197:width
70:grams
54:paper
52:of a
1673:Uses
1662:List
1437:Xuan
1427:Wove
1357:Seed
1337:Rice
1277:Laid
1240:Hemp
1178:Copy
1133:Bond
848:2022
724:The
714:1000
705:mils
626:-by-
571:Ă— 12
560:500
521:500
518:Ă— 38
507:500
504:Ă— 36
493:500
490:Ă— 36
479:480
476:Ă— 36
465:500
426:500
423:Ă— 30
409:Ă— 26
398:500
395:Ă— 24
384:500
381:Ă— 24
370:500
367:Ă— 31
356:500
353:Ă— 22
279:ream
161:mass
130:and
97:ream
62:area
58:mass
40:and
1417:Wax
1367:Tar
841:ISO
1772::
1210:DĂł
971:/
839:.
568:12
546:30
544:Ă—
530:25
515:25
501:24
487:24
473:24
451:28
449:Ă—
435:22
420:22
406:20
392:20
378:19
364:18
350:17
250:.
243:16
234:A4
950:e
943:t
936:v
908:)
904:(
882:.
850:.
710:1
677:2
673:1
670:+
668:8
657:#
644:(
637:2
633:1
630:+
628:9
623:4
619:1
616:+
614:6
597:2
593:1
590:+
588:8
555:2
551:1
548:+
539:2
535:1
532:+
460:2
456:1
453:+
444:2
440:1
437:+
239:1
214:)
210:m
206:(
190:)
186:m
182:(
154:=
34:.
20:)
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