Skip to main content
CalcWisee

Arrow FOC Calculator

Calculate your arrow Front of Center (FOC) percentage for optimal archery flight stability.

Reviewed October 7, 2026 Runs in your browser — inputs are never stored

Arrow FOC Calculator

Front of Center — measures arrow balance point

FOC %

3.6%

Balance

Low FOC — may be unstable in flight

This tool provides general sports and fitness estimates for educational purposes only. It is not medical advice — consult a physician before starting or intensifying training, especially if you have a cardiovascular condition.

About the Arrow FOC Calculator

The arrow FOC calculator measures Front of Center: how far an arrow’s balance point sits ahead of its middle, as a percentage of its length. FOC = (balance point from nock − length ÷ 2) ÷ length × 100. Target arrows typically use 7–15% FOC, while hunting arrows often use more for stability and penetration.

How to use it

  1. 1Measure the arrow length from the nock throat to the end of the shaft.
  2. 2Find the balance point and measure its distance from the nock.
  3. 3Enter both and read the FOC percentage.

Worked example

a 28-inch arrow that balances 15 inches from the nock has an FOC of (15 − 14) ÷ 28 ≈ 3.6% — low for most uses.

Common use cases

  • Tuning arrows
  • Choosing point weights
  • Hunting setups

Frequently asked questions

A:10–15% FOC is ideal for hunting.

Reviewed for accuracy · Last updated October 7, 2026

Formulas follow published sports-science literature and official league definitions (Karvonen heart rate reserve, Cooper and Bruce protocols, MET compendium values, and standard baseball, cricket, and basketball statistics).

CW

CalcWisee Editorial Team

Calculator development and formula review

CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.

Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards

References & sources

Report an issue
Share:

Related calculators

Elo CalculatorCalculate new Elo ratings for chess and sports after a match result.Winning Percentage CalculatorCalculate winning percentage from wins, losses, and optional ties.DIN CalculatorCalculate ski binding DIN setting based on weight, height, age, and ability level.Football Calories CalculatorCalculate calories burned playing football (soccer) by weight, duration, and position.Goalie Save Percentage CalculatorCalculate ice hockey goalie save percentage (SV%) from saves and shots against.
All sports calculators