Description

Create perfectly fitted envelopes for any paper size using a mathematically consistent model.

This calculator is based on a 45° diagonal projection method, allowing you to generate a square envelope blank from any rectangular insert. Unlike standard Vaessen Creative scoring boards, this approach is not limited to predefined sizes and gives you full control over fit and clearance.

The algorithm:

You define:

• Insert width (x)
• Insert length (y)
• Padding (z)

The system calculates:

• Required square paper size
• Two scoring distances

Padding (z) controls how tight or loose the envelope fits.
Recommended defaults:

• 10 mm → tight fit
• 15 mm → standard (default)
• 20 mm → loose / bulky inserts

This method is ideal for:

• Non-standard paper sizes (JIS, custom cuts)
• Folded sheets
• Precision crafting

Calculator

Precalculated Values For Folded Sheets

A series

Paper / Fold	Width (x) in mm	Length (y) in mm	Padding (z)	Square paper size	Score 1	Score 2	Rounded cut size	Rounded score marks
A4 half-fold (A5)	210	148.5	10 mm	273.5 mm × 273.5 mm	158.5 mm	115.0 mm	273 mm × 273 mm	158 mm and 115 mm
A4 half-fold (A5)	210	148.5	15 mm	283.5 mm × 283.5 mm	163.5 mm	120.0 mm	283 mm × 283 mm	163 mm and 120 mm
A4 half-fold (A5)	210	148.5	20 mm	293.5 mm × 293.5 mm	168.5 mm	125.0 mm	293 mm × 293 mm	168 mm and 125 mm
A4 tri-fold	210	99	10 mm	238.5 mm × 238.5 mm	158.5 mm	80.0 mm	238 mm × 238 mm	158 mm and 80 mm
A4 tri-fold	210	99	15 mm	248.5 mm × 248.5 mm	163.5 mm	85.0 mm	248 mm × 248 mm	163 mm and 85 mm
A4 tri-fold	210	99	20 mm	258.5 mm × 258.5 mm	168.5 mm	90.0 mm	258 mm × 258 mm	168 mm and 90 mm
A5 half-fold (A6)	148	105	10 mm	198.9 mm × 198.9 mm	114.7 mm	84.2 mm	199 mm × 199 mm	115 mm and 84 mm
A5 half-fold (A6)	148	105	15 mm	208.9 mm × 208.9 mm	119.7 mm	89.2 mm	209 mm × 209 mm	120 mm and 89 mm
A5 half-fold (A6)	148	105	20 mm	218.9 mm × 218.9 mm	124.7 mm	94.2 mm	219 mm × 219 mm	125 mm and 94 mm
A6 half-fold (A7)	105	74	10 mm	146.6 mm × 146.6 mm	84.2 mm	62.3 mm	147 mm × 147 mm	84 mm and 62 mm
A6 half-fold (A7)	105	74	15 mm	156.6 mm × 156.6 mm	89.2 mm	67.3 mm	157 mm × 157 mm	89 mm and 67 mm
A6 half-fold (A7)	105	74	20 mm	166.6 mm × 166.6 mm	94.2 mm	72.3 mm	167 mm × 167 mm	94 mm and 72 mm

B series — ISO

Paper / Fold	Width (x) in mm	Length (y) in mm	Padding (z)	Square paper size	Score 1	Score 2	Rounded cut size	Rounded score marks
B5 ISO half-fold (B6)	176	125	10 mm	232.8 mm × 232.8 mm	134.5 mm	98.4 mm	233 mm × 233 mm	134 mm and 98 mm
B5 ISO half-fold (B6)	176	125	15 mm	242.8 mm × 242.8 mm	139.5 mm	103.4 mm	243 mm × 243 mm	139 mm and 103 mm
B5 ISO half-fold (B6)	176	125	20 mm	252.8 mm × 252.8 mm	144.5 mm	108.4 mm	253 mm × 253 mm	144 mm and 108 mm
B6 ISO half-fold (B7)	125	88	10 mm	170.6 mm × 170.6 mm	98.4 mm	72.2 mm	171 mm × 171 mm	98 mm and 72 mm
B6 ISO half-fold (B7)	125	88	15 mm	180.6 mm × 180.6 mm	103.4 mm	77.2 mm	181 mm × 181 mm	103 mm and 77 mm
B6 ISO half-fold (B7)	125	88	20 mm	190.6 mm × 190.6 mm	108.4 mm	82.2 mm	191 mm × 191 mm	108 mm and 82 mm

B series — JIS

Paper / Fold	Width (x) in mm	Length (y) in mm	Padding (z)	Square paper size	Score 1	Score 2	Rounded cut size	Rounded score marks
B5 JIS half-fold (B6)	182	128.5	10 mm	239.6 mm × 239.6 mm	138.7 mm	100.9 mm	240 mm × 240 mm	139 mm and 101 mm
B5 JIS half-fold (B6)	182	128.5	15 mm	249.6 mm × 249.6 mm	143.7 mm	105.9 mm	250 mm × 250 mm	144 mm and 106 mm
B5 JIS half-fold (B6)	182	128.5	20 mm	259.6 mm × 259.6 mm	148.7 mm	110.9 mm	260 mm × 260 mm	149 mm and 111 mm
B6 JIS half-fold (B7)	128	91	10 mm	174.9 mm × 174.9 mm	100.5 mm	74.3 mm	175 mm × 175 mm	101 mm and 74 mm
B6 JIS half-fold (B7)	128	91	15 mm	184.9 mm × 184.9 mm	105.5 mm	79.3 mm	185 mm × 185 mm	106 mm and 79 mm
B6 JIS half-fold (B7)	128	91	20 mm	194.9 mm × 194.9 mm	110.5 mm	84.3 mm	195 mm × 195 mm	111 mm and 84 mm