Leather lacing material estimate calculator

Calculate lace length per edge and total lace with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use lace length per edge and total lace to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

JSON Edges to lace [ID,edge length m,measured lace m per edge m]
[["A",1.5,4],["B",0.8,3.5]]
Supplied join/end reserve (m)
0.3
Available continuous lace per spool (m)
5
Lace length per edge (m)
[["A",6.3],["B",3.1]]
Total lace (m)
9.4
Minimum spool purchase by aggregate length
2
Edges needing joins
["A"]

Try another scenario

JSON Edges to lace [ID,edge length m,measured lace m per edge m]
[["A",1.5,4],["B",0.8,3.5]]
Supplied join/end reserve (m)
0.5
Available continuous lace per spool (m)
5
Lace length per edge (m)
[["A",6.5],["B",3.3]]
Total lace (m)
9.8
Minimum spool purchase by aggregate length
2
Edges needing joins
["A"]
Calculation method

Calculation method

Lace length per edge (m)

J([[r[0],r[1]*r[2]+b] for r in a])

Total lace (m)

sum(r[1]*r[2]+b for r in a)

Minimum spool purchase by aggregate length

ceil(sum(r[1]*r[2]+b for r in a)/c)

Edges needing joins

J([r[0] for r in a if r[1]*r[2]+b>c])

Symbols and units
a
JSON Edges to lace [ID,edge length m,measured lace m per edge m]
b
Supplied join/end reserve (m)
c
Available continuous lace per spool (m)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Calculation steps and notation

sum(list) adds all entries in the list.

Assumptions & limits

Assumptions & limits

  • Measured consumption for chosen stitch/lace pattern supplied. Aggregate spool bound does not optimize continuous-cut allocation; join IDs expose edges longer than spool. Supported limits: All numeric inputs must be finite. Only the explicitly described mathematical scenario is supported.
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