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Calcimator

Arrow Build Calculator

Calculate total arrow weight, grains per inch, and FOC from individual component weights for custom arrow builds.

Inputs

gr/in
in
gr
gr
gr
gr
gr

Results

Total Arrow Weight

383 gr

FOC

10.6%

Grains per Inch13.7 gpi
How to Use This Calculator
  1. Enter Shaft Weight in grains per inch and Shaft Length in inches.
  2. Set Insert Weight, Point Weight, Vane Weight per vane, Nock Weight, and Wrap Weight in grains.
  3. Review Total Arrow Weight and FOC (Front of Center) percentage.
  4. Aim for 10-15% FOC for target archery and 15-19% for hunting setups.
  5. Use Grains per Inch (GPI) to compare arrow builds across different shaft specifications.

How the result changes with Shaft Weight

Shaft WeightTotal Arrow WeightFOC
5.1302 gr13.4%
7.85379 gr10.7%
11467 gr8.7%
14551 gr7.4%

What each input means

Shaft Weight
Shaft weight in grains per inch (from manufacturer specs).
Shaft Length
Cut shaft length in inches.
Insert Weight
Weight of the shaft insert or bushing.
Point Weight
Field point or broadhead weight.
Vane Weight (each)
Weight of one vane — total = this × 3.
Nock Weight
Weight of the nock.
Wrap Weight
Weight of arrow wrap (0 if none).

What each result means

Total Arrow Weight
Combined weight of all components.
Grains per Inch
Total weight divided by shaft length.
FOC
Front of Center percentage — 10-15% is ideal.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Shaft Weight = 8, Shaft Length = 28, Insert Weight = 20, Point Weight = 100 = 7 input(s) provided
  2. Calculate Total Arrow Weight
    Total Arrow Weight
    383 = 383
  3. Calculate Grains per Inch
    Grains per Inch
    13.7 = 13.7

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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