Pscale Bass String Wrap Size Calculator
Version 1.0 © Tremaine Parsons 2017
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Enter Core Diameter and Outside Diameter
Calculated Wrap Sizes have a 2% OD winding crush factor added to wrap sizes.
Core and Outside Diameters can be either Decimal or Metric provided both are same standard.

Single Wrapped Bass String

Converter
Core Diameter
Outside Diameter
Metric Wrap Size
Decimal Wrap Size
mm. >
Dec.>
   

Wrap Crush Factors = .02 & .02 | Doublewound Outer Wrap to Inner Wrap ratio = 3:1

Double Wrapped Bass String

Core Diameter
Outside Diameter
Metric Wrap
Size (Inner)
Metric Wrap
Size (Outer)
Decimal Wrap
Size (Inner)
Decimal Wrap
Size (Outer)
is default is alternate

Note: Values smaller than horizontal lines in each table are at greater risk of breaking when used as
inner wraps on double wound strings. This program is to be used as a preliminary guideline based on
outer wraps being 3 times the diameter of inner wraps on double wound strings. Crush factor will vary
by winder and thickness of wrap material. Experienced string winders know how to achieve target
outside diameters and have their own refined methods to do this. Values in italics are difficult to wind.

Metric Wrap Sizes
 

0.150
0.200
0.225
0.250
0.275
0.300
0.325
0.350

0.375
0.400
0.425
0.450
0.475
0.500
0.525
0.550
0.575
0.600
0.625
0.650
0.675
0.700
0.725
0.750
0.775
0.800
0.825
0.850
0.875
0.900
0.925
0.950
0.975
1.000
1.025
1.050
1.075
1.100
1.125
1.150
1.175
1.200
1.225
1.250
1.300
1.350
1.400
1.450
1.500
1.550
1.600
1.650
1.700
1.750
1.800
1.850
1.900
1.950
2.000
2.050
2.100
2.150

American Wrap Sizes
W/M Gage - Decimal in.
43    .0060
42    .0062
41    .0066
40    .0070

39    .0075
38    .0080
37    .0085
36    .0090
35    .0095
34    .0104
33    .0118
32    .0128
31    .0132

30    .0140
29    .0150
28    .0162
27    .0173
26    .0181
25    .0204
24    .0230
23    .0258
22    .0286
21    .0317
20    .0348
19.5 .0379
19    .0410
18.5 .0443
18    .0475
17.5 .0508
17    .0540
16.5 .0580
16    .0625
15.5 .0673
15    .0720
14.5 .0760
14    .0800

AWG Size
Gage - in.
12  .0808
13  .0720
14  .0641
15  .0571
15  .0508
17  .0453
18  .0403
19  .0359
20  .0320
21  .0285
22  .0253
23  .0226
24  .0201
25  .0179
26  .0159
27  .0142

28  .0126
29  .0113
30  .0100
31  .00893
32  .00795
33  .00708
34  .0063