Jewelry bracelet fit allowance calculator

Calculate target inner circumference and approximate bead centerline strand with your own figures.

Your numbers

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

Use target inner circumference and approximate bead centerline strand to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Wrist circumference (mm)
170
User comfort allowance (mm)
10
Round bead radius (mm)
4
Target inner circumference (mm)
180
Approximate bead centerline strand (mm)
205.132741

Try another scenario

Wrist circumference (mm)
170
User comfort allowance (mm)
10
Round bead radius (mm)
5
Target inner circumference (mm)
180
Approximate bead centerline strand (mm)
211.415927
Calculation method

Calculation method

Target inner circumference (mm)

a+b

Approximate bead centerline strand (mm)

a+b+2*math.pi*c

Symbols and units
a
Wrist circumference (mm)
b
User comfort allowance (mm)
c
Round bead radius (mm)

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

Assumptions & limits

Assumptions & limits

  • Circular bracelet approximation with equal-radius beads; no clasp deduction. Comfort allowance supplied, no universal fit rule. Supported limits: All numeric inputs must be finite. Only the explicitly described mathematical scenario is supported.
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