{"id":581,"date":"2026-10-03T13:45:53","date_gmt":"2026-10-03T13:45:53","guid":{"rendered":"https:\/\/envelopedock.com\/uncategorized\/envelope-weight-conversion\/"},"modified":"2026-10-03T13:45:53","modified_gmt":"2026-10-03T13:45:53","slug":"envelope-weight-conversion","status":"publish","type":"post","link":"https:\/\/envelopedock.com\/ru\/resources\/design-standards\/envelope-weight-conversion\/","title":{"rendered":"\u041f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0432\u0435\u0441\u0430 \u043a\u043e\u043d\u0432\u0435\u0440\u0442\u0430: \u0442\u0430\u0431\u043b\u0438\u0446\u0430 \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0430 GSM \u0432 \u0444\u0443\u043d\u0442\u044b, \u0431\u0430\u0437\u043e\u0432\u044b\u0439 \u0432\u0435\u0441 \u0438 \u0433\u0440\u0430\u043c\u043c\u044b"},"content":{"rendered":"

\u0412\u0432\u0435\u0434\u0435\u043d\u0438\u0435<\/h2>\n\n

Ask two suppliers for \"100 lb paper\" and you can receive two materials that differ by more than double in actual weight. That is not a mistake on either side \u2014 it is how the US paper-weight system works, and it is the single most common source of confusion in envelope specification.<\/p>\n\n

The reason is that American paper weights are not weights. They describe how much a ream of 500 sheets weighs at that grade's own uncut sheet size<\/strong> \u2014 and every grade uses a different sheet size. Bond, text, cover, index, and tag each start from a different rectangle, so the same number describes a different thickness of paper in each.<\/p>\n\n

This guide explains the basis sizes behind each grade, gives the conversion formula, and provides gsm-to-lb charts for every grade used in envelope making. For which paper to choose in the first place \u2014 finishes, fiber, and use cases \u2014 see our \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u0435 \u043f\u043e \u0442\u0438\u043f\u0430\u043c \u0438 \u043f\u043b\u043e\u0442\u043d\u043e\u0441\u0442\u0438 \u0431\u0443\u043c\u0430\u0433\u0438 \u0434\u043b\u044f \u043a\u043e\u043d\u0432\u0435\u0440\u0442\u043e\u0432<\/a>; that article covers selection, and this one covers the arithmetic that lets you compare materials across systems.<\/p>\n\n

Why \"lb\" Is Not a Weight<\/h2>\n\n

A paper's pound value answers a specific question: what does a ream of 500 uncut sheets weigh, at this grade's standard sheet size?<\/p>\n\n\n
\u0422\u0435\u0440\u043c\u0438\u043d<\/th>What It Actually Means<\/th><\/tr>\n
lb (US basis weight)<\/strong><\/td>Weight of 500 sheets at the grade's basis size<\/td><\/tr>\n
gsm (g\/m\u00b2)<\/strong><\/td>Weight of one square metre of the paper<\/td><\/tr>\n
Ream<\/strong><\/td>500 sheets<\/td><\/tr>\n
Basis size<\/strong><\/td>The uncut sheet size that grade is measured at<\/td><\/tr>\n<\/table>\n\n

Because the basis size differs by grade, the comparison only works within a grade. A 24 lb bond and a 24 lb text are not the same material \u2014 the bond is measured on a much smaller sheet, so its 24 lb represents a thicker paper.<\/p>\n\n\n
\u0421\u0438\u0441\u0442\u0435\u043c\u0430<\/th>Used In<\/th>Basis<\/th><\/tr>\n
Basis weight (lb)<\/strong><\/td>US, Canada<\/td>Grade-specific sheet size<\/td><\/tr>\n
Grammage (gsm)<\/strong><\/td>Most of the world<\/td>One square metre, always<\/td><\/tr>\n<\/table>\n\n

Grammage is the more portable measure precisely because its basis never changes.<\/p>\n\n

The Basis Sizes Behind Each Grade<\/h2>\n\n

This table is the root of the whole problem \u2014 and the reason the same number means different papers.<\/p>\n\n\n
\u041c\u0430\u0440\u043a\u0430<\/th>Basis Size (inches)<\/th>Basis Area (in\u00b2)<\/th><\/tr>\n
Bond<\/strong><\/td>17 \u00d7 22<\/td>374<\/td><\/tr>\n
Text \/ Book \/ Offset<\/strong><\/td>25 \u00d7 38<\/td>950<\/td><\/tr>\n
Cover<\/strong><\/td>20 \u00d7 26<\/td>520<\/td><\/tr>\n
Index<\/strong><\/td>25.5 \u00d7 30.5<\/td>778<\/td><\/tr>\n
Bristol<\/strong><\/td>22.5 \u00d7 28.5<\/td>641<\/td><\/tr>\n
Tag<\/strong><\/td>24 \u00d7 36<\/td>864<\/td><\/tr>\n
\u0413\u0430\u0437\u0435\u0442\u043d\u0430\u044f \u0431\u0443\u043c\u0430\u0433\u0430<\/strong><\/td>24 \u00d7 36<\/td>864<\/td><\/tr>\n<\/table>\n\n

The spread is large: bond is measured on a sheet of 374 square inches, text on one of 950 \u2014 two and a half times the area. That single fact explains almost every \"100 lb\" surprise.<\/p>\n\n\n
If two papers share the number 100\u2026<\/th>Their relative weight depends on<\/th><\/tr>\n
Their basis sizes<\/strong><\/td>A smaller basis size means a heavier paper<\/td><\/tr>\n
Bond vs text<\/strong><\/td>Bond's smaller sheet makes its 100 lb much heavier<\/td><\/tr>\n<\/table>\n\n

\u0424\u043e\u0440\u043c\u0443\u043b\u0430 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u044f<\/h2>\n\n

Two conversions, both reversible.<\/p>\n\n\n
\u041d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435<\/th>\u0424\u043e\u0440\u043c\u0443\u043b\u0430<\/th><\/tr>\n
lb to gsm<\/strong><\/td>gsm = lb \u00d7 453.592 \u00f7 (500 \u00d7 basis area in\u00b2) \u00d7 1550<\/td><\/tr>\n
gsm to lb<\/strong><\/td>lb = gsm \u00d7 (500 \u00d7 basis area in\u00b2) \u00f7 1550 \u00f7 453.592<\/td><\/tr>\n<\/table>\n\n

The constants: 453.592 grams per pound, 500 sheets per ream, 1550 square inches per square metre.<\/p>\n\n\n
Input<\/th>Symbol<\/th>\u0417\u043d\u0430\u0447\u0435\u043d\u0438\u0435<\/th><\/tr>\n
Pounds to grams<\/strong><\/td>453.592<\/td>g per lb<\/td><\/tr>\n
Sheets per ream<\/strong><\/td>500<\/td>sheets<\/td><\/tr>\n
Square inches per m\u00b2<\/strong><\/td>1550.003<\/td>in\u00b2 per m\u00b2<\/td><\/tr>\n
Basis area<\/strong><\/td>varies<\/td>by grade<\/td><\/tr>\n<\/table>\n\n

Worked example \u2014 20 lb bond:<\/p>\n\n\n
\u0428\u0430\u0433<\/th>\u0420\u0430\u0441\u0447\u0451\u0442<\/th>\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442<\/th><\/tr>\n
Pounds to grams<\/strong><\/td>20 \u00d7 453.592<\/td>9,072 g<\/td><\/tr>\n
Per ream<\/strong><\/td>9,072 \u00f7 (500 \u00d7 374)<\/td>0.0485 g\/in\u00b2<\/td><\/tr>\n
Convert area<\/strong><\/td>0.0485 \u00d7 1550<\/td>75 \u0433\/\u043c\u00b2<\/strong><\/td><\/tr>\n<\/table>\n\n

The same arithmetic on 20 lb text would give a very different answer \u2014 which is the point.<\/p>\n\n

Bond Grade: gsm Equivalents<\/h2>\n\n

Bond is the classic envelope and letterhead grade, measured on a 17 \u00d7 22 sheet.<\/p>\n\n\n
Basis Weight<\/th>\u041f\u043b\u043e\u0442\u043d\u043e\u0441\u0442\u044c<\/th>\u0422\u0438\u043f\u0438\u0447\u043d\u043e\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435<\/th><\/tr>\n
13 lb<\/strong><\/td>49 gsm<\/td>Lightweight, airmail<\/td><\/tr>\n
16 lb<\/strong><\/td>61 gsm<\/td>Light correspondence<\/td><\/tr>\n
20 \u0444\u0443\u043d\u0442\u043e\u0432<\/strong><\/td>75 \u0433\/\u043c\u00b2<\/td>Standard office paper<\/td><\/tr>\n
24 lb<\/strong><\/td>90 \u0433\/\u043c\u00b2<\/td>\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0435 \u0434\u0435\u043b\u043e\u0432\u044b\u0435 \u043a\u043e\u043d\u0432\u0435\u0440\u0442\u044b<\/td><\/tr>\n
28 lb<\/strong><\/td>105 \u0433\/\u043c\u00b2<\/td>\u041f\u0440\u0435\u043c\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u0434\u0435\u043b\u043e\u0432\u043e\u0439<\/td><\/tr>\n
32 \u0444\u0443\u043d\u0442\u0430<\/strong><\/td>120 \u0433\/\u043c\u00b2<\/td>Heavy correspondence<\/td><\/tr>\n
36 lb<\/strong><\/td>135 gsm<\/td>Very heavy<\/td><\/tr>\n
40 \u0444\u0443\u043d\u0442\u043e\u0432<\/strong><\/td>151 gsm<\/td>Card-like bond<\/td><\/tr>\n<\/table>\n\n

The widely repeated equivalence is that 20 lb bond is close to 75\u201380 gsm, which is why US office paper and European A4 feel similar.<\/p>\n\n\n
Observation<\/th>\u041f\u0440\u0438\u043c\u0435\u0447\u0430\u043d\u0438\u0435<\/th><\/tr>\n
20 lb bond \u2248 80 gsm A4<\/strong><\/td>Close but not identical<\/td><\/tr>\n
24 lb bond \u2248 90 gsm<\/strong><\/td>The common business envelope weight<\/td><\/tr>\n
28 lb bond \u2248 105\u2013110 gsm<\/strong><\/td>\u041f\u0440\u0435\u043c\u0438\u0430\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u0440\u0440\u0435\u0441\u043f\u043e\u043d\u0434\u0435\u043d\u0446\u0438\u044f<\/td><\/tr>\n<\/table>\n\n

Text \/ Book Grade: gsm Equivalents<\/h2>\n\n

Text \u2014 also called book or offset \u2014 is measured on the much larger 25 \u00d7 38 sheet, so its numbers run higher for the same actual weight.<\/p>\n\n\n
Basis Weight<\/th>\u041f\u043b\u043e\u0442\u043d\u043e\u0441\u0442\u044c<\/th>\u0422\u0438\u043f\u0438\u0447\u043d\u043e\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435<\/th><\/tr>\n
30 lb<\/strong><\/td>44 gsm<\/td>Directories, lightweight<\/td><\/tr>\n
40 \u0444\u0443\u043d\u0442\u043e\u0432<\/strong><\/td>59 gsm<\/td>Light text<\/td><\/tr>\n
45 lb<\/strong><\/td>67 gsm<\/td>Light book<\/td><\/tr>\n
50 lb<\/strong><\/td>74 gsm<\/td>Standard text<\/td><\/tr>\n
60 lb<\/strong><\/td>89 gsm<\/td>Book pages<\/td><\/tr>\n
70 lb<\/strong><\/td>104 gsm<\/td>Heavier book<\/td><\/tr>\n
80 lb<\/strong><\/td>118 gsm<\/td>Premium text<\/td><\/tr>\n
90 lb<\/strong><\/td>133 gsm<\/td>Heavy text<\/td><\/tr>\n
100 lb<\/strong><\/td>148 gsm<\/td>Cover-weight text<\/td><\/tr>\n
120 lb<\/strong><\/td>178 gsm<\/td>Very heavy text<\/td><\/tr>\n<\/table>\n\n

The comparison that trips people up: 50 lb text is about 74 gsm, while 24 lb bond is about 90 gsm. The text number looks larger and the paper is lighter.<\/p>\n\n\n
Looks like<\/th>Actually is<\/th><\/tr>\n
\"50 lb is heavier than 24 lb\"<\/strong><\/td>74 gsm vs 90 gsm \u2014 text is lighter<\/td><\/tr>\n
\"Text numbers are bigger\"<\/strong><\/td>Because the text basis sheet is bigger<\/td><\/tr>\n<\/table>\n\n

Cover Grade: gsm Equivalents<\/h2>\n\n

Cover \u2014 the card stock used for stiff envelope backs and heavy inserts \u2014 is measured on a 20 \u00d7 26 sheet.<\/p>\n\n\n
Basis Weight<\/th>\u041f\u043b\u043e\u0442\u043d\u043e\u0441\u0442\u044c<\/th>\u0422\u0438\u043f\u0438\u0447\u043d\u043e\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435<\/th><\/tr>\n
50 lb<\/strong><\/td>135 gsm<\/td>\u041b\u0451\u0433\u043a\u0430\u044f \u043e\u0442\u043a\u0440\u044b\u0442\u043a\u0430<\/td><\/tr>\n
60 lb<\/strong><\/td>163 gsm<\/td>\u041a\u0430\u0440\u0442\u0430<\/td><\/tr>\n
65 lb<\/strong><\/td>176 \u0433\/\u043c\u00b2<\/td>Common card stock<\/td><\/tr>\n
80 lb<\/strong><\/td>216 \u0433\/\u043c\u00b2<\/td>Solid card<\/td><\/tr>\n
90 lb<\/strong><\/td>243 gsm<\/td>\u0422\u044f\u0436\u0451\u043b\u044b\u0439 \u043a\u0430\u0440\u0442\u043e\u043d<\/td><\/tr>\n
100 lb<\/strong><\/td>271 gsm<\/td>Very heavy card<\/td><\/tr>\n
110 lb<\/strong><\/td>298 \u0433\/\u043c\u00b2<\/td>Stiff card<\/td><\/tr>\n
130 lb<\/strong><\/td>352 \u0433\/\u043c\u00b2<\/td>\u0416\u0451\u0441\u0442\u043a\u0438\u0439<\/td><\/tr>\n
160 lb<\/strong><\/td>433 gsm<\/td>Board<\/td><\/tr>\n<\/table>\n\n

The famous \"110 lb cardstock\" is roughly 298 gsm \u2014 a genuinely rigid material, which is why it is often confused with a heavier bond.<\/p>\n\n\n
Common phrase<\/th>\u0433\/\u043c\u00b2<\/th>Reality<\/th><\/tr>\n
\"110 lb cardstock\"<\/strong><\/td>~298 gsm<\/td>\u0416\u0451\u0441\u0442\u043a\u0438\u0439 \u043a\u0430\u0440\u0442\u043e\u043d<\/td><\/tr>\n
\"80 lb cardstock\"<\/strong><\/td>~216 gsm<\/td>Solid card<\/td><\/tr>\n
\"65 lb cardstock\"<\/strong><\/td>~176 gsm<\/td>Everyday card<\/td><\/tr>\n<\/table>\n\n

Index, Tag and Newsprint<\/h2>\n\n

These grades appear less often in envelopes but come up in specialty and postal work.<\/p>\n\n\n
\u041c\u0430\u0440\u043a\u0430<\/th>Basis Size<\/th>Basis Weight \u2192 Grammage<\/th><\/tr>\n
Index<\/strong><\/td>25.5 \u00d7 30.5<\/td>90 lb \u2192 163 gsm \u00b7 140 lb \u2192 252 gsm \u00b7 220 lb \u2192 398 gsm<\/td><\/tr>\n
Tag<\/strong><\/td>24 \u00d7 36<\/td>Measured on the same sheet as newsprint<\/td><\/tr>\n
\u0413\u0430\u0437\u0435\u0442\u043d\u0430\u044f \u0431\u0443\u043c\u0430\u0433\u0430<\/strong><\/td>24 \u00d7 36<\/td>22 lb \u2192 36 gsm \u00b7 28 lb \u2192 46 gsm \u00b7 30 lb \u2192 49 gsm \u00b7 32 lb \u2192 52 gsm \u00b7 34 lb \u2192 55 gsm<\/td><\/tr>\n<\/table>\n\n

Newsprint illustrates the basis-size effect in reverse: 22 lb newsprint is only 36 gsm, far lighter than 20 lb bond at 75 gsm, because newsprint is measured on a sheet more than twice as large.<\/p>\n\n\n
\u041c\u0430\u0440\u043a\u0430<\/th>Basis Area<\/th>\u042d\u0444\u0444\u0435\u043a\u0442<\/th><\/tr>\n
Bond (374 in\u00b2)<\/strong><\/td>Smallest<\/td>Numbers look small, paper is heavy<\/td><\/tr>\n
Newsprint \/ Tag (864 in\u00b2)<\/strong><\/td>\u0411\u043e\u043b\u044c\u0448\u043e\u0439<\/td>Numbers look similar, paper is light<\/td><\/tr>\n<\/table>\n\n

The Same Number, Different Paper<\/h2>\n\n

This is the table to keep. Applying the formula at 100 lb across grades:<\/p>\n\n\n
Grade at 100 lb<\/th>Basis Area (in\u00b2)<\/th>Approximate Grammage<\/th><\/tr>\n
Text \/ Book<\/strong><\/td>950<\/td>148 gsm<\/strong><\/td><\/tr>\n
Index<\/strong><\/td>778<\/td>~181 gsm<\/td><\/tr>\n
Cover<\/strong><\/td>520<\/td>271 gsm<\/strong><\/td><\/tr>\n
Bond<\/strong><\/td>374<\/td>~376 gsm<\/td><\/tr>\n<\/table>\n\n

A \"100 lb\" envelope could be a light 148 gsm text stock or a rigid 376 gsm bond \u2014 a difference of two and a half times, from the same instruction.<\/p>\n\n\n
What you meant<\/th>What to write<\/th><\/tr>\n
A light book-weight paper<\/strong><\/td>100 lb text, or 148 gsm<\/td><\/tr>\n
A stiff card back<\/strong><\/td>100 lb cover, or 271 gsm<\/td><\/tr>\n
A heavy writing paper<\/strong><\/td>100 lb bond, or ~376 gsm<\/td><\/tr>\n<\/table>\n\n

The safe habit is to specify both systems<\/strong> \u2014 for example \"90 gsm \/ 24 lb bond\" \u2014 so the supplier cannot resolve the ambiguity the wrong way.<\/p>\n\n

Envelope Self-Weight and Postage<\/h2>\n\n

Envelope weight matters beyond feel, because the envelope itself consumes part of the first weight bracket.<\/p>\n\n\n
\u041f\u043b\u043e\u0442\u043d\u043e\u0441\u0442\u044c \u0431\u0443\u043c\u0430\u0433\u0438<\/th>Effect on a Mailpiece<\/th><\/tr>\n
\u0411\u043e\u043b\u0435\u0435 \u043b\u0451\u0433\u043a\u0438\u0439 \u043a\u0430\u0440\u0442\u043e\u043d<\/strong><\/td>More of the first bracket left for contents<\/td><\/tr>\n
\u0411\u043e\u043b\u0435\u0435 \u043f\u043b\u043e\u0442\u043d\u0430\u044f \u0431\u0443\u043c\u0430\u0433\u0430<\/strong><\/td>Envelope alone may approach the bracket limit<\/td><\/tr>\n
Lined or rigid<\/strong><\/td>Adds further weight<\/td><\/tr>\n<\/table>\n\n

For a single letter the envelope is a small share of the total. For a bulk mailing of thousands, the difference between two paper weights is measurable in postage.<\/p>\n\n\n
Practical check<\/th>\u041f\u043e\u0447\u0435\u043c\u0443<\/th><\/tr>\n
Weigh a finished, loaded piece<\/strong><\/td>\u0410 \u043d\u0435 \u043f\u0443\u0441\u0442\u043e\u0439 \u043a\u043e\u043d\u0432\u0435\u0440\u0442<\/td><\/tr>\n
Weigh a sample from the actual stock<\/strong><\/td>Basis weight is nominal, not exact<\/td><\/tr>\n
Multiply across the quantity<\/strong><\/td>Small per-piece differences scale<\/td><\/tr>\n<\/table>\n\n

One caution worth knowing: the stated basis weight is a nominal figure, and actual production runs vary slightly around it. Ask the supplier what tolerance applies to the grade you are buying rather than assuming the number is exact \u2014 and if weight is critical, ask for the measured value of the batch.<\/p>\n\n

Applying This to Envelope Specification<\/h2>\n\n

A short procedure for specifying weight without getting caught out.<\/p>\n\n\n
\u0428\u0430\u0433<\/th>\u0414\u0435\u0439\u0441\u0442\u0432\u0438\u0435<\/th><\/tr>\n
1<\/strong><\/td>Decide the system you are buying in (metric or US)<\/td><\/tr>\n
2<\/strong><\/td>If US, name the grade \u2014 bond, text, cover \u2014 never just the number<\/td><\/tr>\n
3<\/strong><\/td>Convert with the grade's basis size, not a generic factor<\/td><\/tr>\n
4<\/strong><\/td>State both systems on the purchase order<\/td><\/tr>\n
5<\/strong><\/td>Confirm the tolerance with the supplier<\/td><\/tr>\n
6<\/strong><\/td>Check print and finishing compatibility<\/td><\/tr>\n<\/table>\n\n

Print and finishing behaviour follows weight and coating: a heavier, coated sheet takes foil and emboss differently from a light uncoated one, which is worth confirming against your file specification \u2014 see our guide to \u0444\u0430\u0439\u043b\u043e\u0432, \u0433\u043e\u0442\u043e\u0432\u044b\u0445 \u043a \u043f\u0435\u0447\u0430\u0442\u0438<\/a>. Weight also feeds directly into material cost, which we cover in our \u0441\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0435\u0447\u0430\u0442\u0438 \u043a\u043e\u043d\u0432\u0435\u0440\u0442\u043e\u0432<\/a> \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u0435.<\/p>\n\n\n
Grade pair often confused<\/th>Distinguishing question<\/th><\/tr>\n
Bond vs text<\/strong><\/td>Is this writing paper or book paper?<\/td><\/tr>\n
Text vs cover<\/strong><\/td>Is it a page or a cover?<\/td><\/tr>\n
Cover vs index<\/strong><\/td>Card stock or index card?<\/td><\/tr>\n<\/table>\n\n

\u0420\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0451\u043d\u043d\u044b\u0435 \u043e\u0448\u0438\u0431\u043a\u0438<\/h2>\n\n\n
\u041e\u0448\u0438\u0431\u043a\u0430<\/th>\u041f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u0435<\/th>\u0418\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c<\/th><\/tr>\n
Treating lb as a weight<\/strong><\/td>Wrong material ordered<\/td>It is a ream weight at a grade-specific size<\/td><\/tr>\n
Using one conversion factor for all grades<\/strong><\/td>Answers off by 2.5\u00d7<\/td>Use the grade's own basis size<\/td><\/tr>\n
Comparing 100 lb text to 100 lb bond<\/strong><\/td>Assumes equal weight; they differ hugely<\/td>Compare in gsm<\/td><\/tr>\n
Dropping the grade name<\/strong><\/td>Supplier guesses<\/td>Always write bond\/text\/cover<\/td><\/tr>\n
Assuming nominal weight is exact<\/strong><\/td>Postage or feel surprise<\/td>Ask the batch tolerance<\/td><\/tr>\n
Converting size units as if weight<\/strong><\/td>Wrong method entirely<\/td>Size uses 25.4; weight uses basis area<\/td><\/tr>\n<\/table>\n\n

Note the last row: \u0442\u0430\u0431\u043b\u0438\u0446\u0443 \u043f\u0435\u0440\u0435\u0441\u0447\u0451\u0442\u0430 \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u0432 \u043a\u043e\u043d\u0432\u0435\u0440\u0442\u043e\u0432<\/a> is a simple 25.4 mm-per-inch multiplication, while weight conversion depends on the grade. The two look similar and are not.<\/p>\n\n

\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h2>\n\n

Envelope weight conversion<\/strong> works because grammage has a fixed basis \u2014 one square metre \u2014 while US pound values are measured against a different sheet size for every grade. Bond uses 17 \u00d7 22, text uses 25 \u00d7 38, cover uses 20 \u00d7 26, index uses 25.5 \u00d7 30.5, and tag and newsprint use 24 \u00d7 36. That is why 100 lb text is roughly 148 gsm while 100 lb bond is roughly 376 gsm.<\/p>\n\n

Convert with the grade's own basis size, state both systems on the order, and never quote a pound value without its grade name. For choosing between papers \u2014 finishes, fibers, and the uses each suits \u2014 see our \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u0435 \u043f\u043e \u0442\u0438\u043f\u0430\u043c \u0438 \u043f\u043b\u043e\u0442\u043d\u043e\u0441\u0442\u0438 \u0431\u0443\u043c\u0430\u0433\u0438 \u0434\u043b\u044f \u043a\u043e\u043d\u0432\u0435\u0440\u0442\u043e\u0432<\/a>.<\/p>\n\n

Specifying a paper weight and want it confirmed before the run? \u0417\u0430\u043f\u0440\u043e\u0441\u0438\u0442\u044c \u0440\u0430\u0441\u0447\u0451\u0442<\/a> with the grade and grammage you need.<\/p>","protected":false},"excerpt":{"rendered":"Introduction Ask two suppliers for “100 lb paper” and you can receive two materials that differ by more than double in actual weight. That is not a mistake on either side \u2014 it is how the US paper-weight system works, and it is the single most common source of confusion in envelope specification. The reason […]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_metadesc":"Envelope weight conversion explained \u2014 why 100 lb text is not 100 lb bond, the basis sizes behind each grade, and full gsm to lb charts.","footnotes":""},"categories":[5],"tags":[],"class_list":["post-581","post","type-post","status-publish","format-standard","hentry","category-design-standards"],"_links":{"self":[{"href":"https:\/\/envelopedock.com\/ru\/wp-json\/wp\/v2\/posts\/581","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/envelopedock.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/envelopedock.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/envelopedock.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/envelopedock.com\/ru\/wp-json\/wp\/v2\/comments?post=581"}],"version-history":[{"count":0,"href":"https:\/\/envelopedock.com\/ru\/wp-json\/wp\/v2\/posts\/581\/revisions"}],"wp:attachment":[{"href":"https:\/\/envelopedock.com\/ru\/wp-json\/wp\/v2\/media?parent=581"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/envelopedock.com\/ru\/wp-json\/wp\/v2\/categories?post=581"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/envelopedock.com\/ru\/wp-json\/wp\/v2\/tags?post=581"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}