Arrow Weight Calculator
Add up total arrow weight in grains and grams from shaft length and GPI, point, insert, nock, fletching and wrap, with optional grains per pound of draw weight.
Interactive calculator · Method ARROW-WEIGHT-1.0 · Last reviewed: 2026-11-04
Calculate your scenario
Total grains = shaft length × GPI + point + insert + nock + (number of fletchings × grains each) + wrap.
Your inputs
Default worked example. Edit the inputs to calculate your scenario.
Default worked example
29 in × 9.5 gr/in = 275.5 gr + 144 gr of components = 419.5 gr.
How to use the calculator
Enter the cut shaft length and the maker’s GPI, then the grain weight of each component. Add a draw weight only if you want the grains-per-pound ratio.
What the result means
A 29 in shaft at 9.5 GPI with a 100 gr point, 16 gr insert, 10 gr nock and three 6 gr vanes weighs 419.5 gr (27.18 g), about 6.99 grains per pound at 60 lb.
Formula and units
Total grains = shaft length × GPI + point + insert + nock + (number of fletchings × grains each) + wrap. Grams = grains × 0.06479891 (exact). Grains per pound = total grains ÷ draw weight.
Worked examples
29 in, 9.5 GPI, 100 gr point: Shaft length (cut length): 29 in; Shaft weight per inch (GPI, from the maker): 9.5 gr/in; Point or broadhead: 100 gr; Insert (and any collar or weight): 16 gr; Nock (and bushing): 10 gr; Number of vanes or feathers: 3 fletchings; Weight per vane or feather: 6 gr; Wrap (0 = none): 0 gr; Draw weight for GPP (0 = skip): 60 lb.
Example result: Total arrow weight: 419.5 gr; Total in grams: 27.18 g; Shaft weight: 275.5 gr; Components (point to wrap): 144 gr; Grains per pound of draw weight: 6.99 gr/lb.
28.5 in, 6.5 GPI, 125 gr broadhead, 70 lb: Shaft length (cut length): 28.5 in; Shaft weight per inch (GPI, from the maker): 6.5 gr/in; Point or broadhead: 125 gr; Insert (and any collar or weight): 50 gr; Nock (and bushing): 8 gr; Number of vanes or feathers: 4 fletchings; Weight per vane or feather: 5 gr; Wrap (0 = none): 7 gr; Draw weight for GPP (0 = skip): 70 lb.
Example result: Total arrow weight: 395.3 gr; Total in grams: 25.61 g; Shaft weight: 185.3 gr; Components (point to wrap): 210 gr; Grains per pound of draw weight: 5.65 gr/lb.
Limitations and common mistakes
Mass total only. It does not choose a spine, a safe minimum arrow weight, a draw weight or broadhead performance; follow the bow and arrow makers’ published requirements. GPI and component weights vary by batch, so weigh finished arrows on a grain scale when it matters. Glue and cut-off waste are not counted.
Multiplying GPI by the full arrow length including the point and nock, or using the uncut shaft length after the arrow has been cut.
Sources and assumptions
Method ARROW-WEIGHT-1.0; last formula review 2026-11-04. Sources and their supported claims. Calculation methodology.