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FOC Calculator

Calculate your arrow's Front of Center balance, total arrow weight, kinetic energy, and momentum — for hunting, 3D archery, or target shooting.

Ideal FOC: 10–15% target · 15–19% hunting · 19%+ big game / heavy

Arrow Shaft

Length and weight of the bare shaft

Arrow Length (inches)

Shaft Weight (grains)

Shaft Material

Arrow Spine

Units

Arrow Components

Point, nock, vanes/fletching, and insert weights

Point / Broadhead (grains)

Point Type

Insert Weight (grains)

Nock Weight (grains)

Fletching Type

Fletching Weight (grains total)

Wrap Weight (grains)

Other Weight (grains)

Bow & Performance

Arrow speed for kinetic energy and momentum

Arrow Speed (fps)

Draw Weight (lbs)

Draw Length (inches)

Quick Presets

Common arrow build configurations

Summary

Front of Center (FOC)

—

Total Weight—

Balance Point—

Arrow Midpoint—

FOC Offset—

GPI (gr/inch)—

Performance

Kinetic Energy—

Momentum—

Arrow Speed—

FOC Range Guide

Target / 3D10–15%

General Hunting15–19%

Big Game19–25%

High FOC> 25%

FOC Calculator

Arrow Shaft

Arrow Components

Bow & Performance

Quick Presets

FOC & Balance Point

Weight Breakdown

Kinetic Energy & Momentum