The complete arrow FOC calculator and f.o.c. calculator for archery. Calculate your arrow's front of center percentage, arrow kinetic energy, and arrow speed instantly. Used by bowhunters, target archers, and fans of podium archery, Gold Tip, Easton, and ranch fairy FOC setups.
Calculating arrow FOC (or calculating FOC) requires three measurements: total arrow length, the distance from the nock to the balance point, and optionally the component weights (tip, nock, fletching). Here is the complete how to calculate FOC on an arrow process:
The f.o.c. calculator formula is: FOC % = (Balance Point from Nock ÷ Total Arrow Length) × 100. For example, a 29-inch arrow with the balance point at 8 inches from the nock gives: (8 ÷ 29) × 100 = 27.6% FOC. Use the arrow FOC calculator above for instant calculate FOC arrow results.
The arrow kinetic energy calculator (also called arrow KE calculator, archery KE calculator, archery kinetic energy calculator, or bow and arrow kinetic energy calculator) computes the energy your arrow carries at launch. This is the most important factor for hunting effectiveness and ethical kills.
The kinetic energy calculator for arrows uses: KE (ft-lbs) = (Arrow Weight in grains × Arrow Speed² in fps) ÷ 450,240. This formula is used by every archery kinetic energy calculator, arrow energy calculator, and bow KE calculator on the market.
The kinetic energy archery calculator above calculates your exact KE from your arrow weight (grains) and arrow speed (fps). This is what the kinetic energy calculator archery community calls "arrow energy" — not to be confused with momentum, which uses a separate formula.
Every major arrow brand uses the same FOC formula. The foc calculator gold tip and Easton FOC calculator both apply: FOC % = (balance point ÷ arrow length) × 100. Brand-specific tools simply pre-fill arrow length data for their product lines.
Gold Tip recommends 10–15% FOC for their hunting arrows. Enter your Gold Tip arrow specs above for instant foc calculator gold tip results.
Easton's published FOC guidelines: 7–11% for target, 10–15% for hunting. This foc calculator works for all Easton shafts.
Any archery foc calculator uses the same formula. This foc calculator archery tool is brand-agnostic and works for all shafts.
Whether you say calculating arrow FOC, calculate arrow FOC, or calculate FOC arrow — it's the same process. Use the foc calc above.
While this page focuses on the arrow FOC calculator, arrow spine is equally important for tuning. An arrow spine calculator determines the correct shaft stiffness for your bow setup based on draw weight, draw length, and point weight. Related tools in this category:
Note: The arrow spine calculator and arrow ballistics calculator functions are separate tools. This page handles foc calculator and arrow kinetic energy calculator calculations only.
A common question when using an arrow FOC calculator or arrow KE calculator is: how much does an arrow weigh? Arrow weight is measured in grains (gr) and affects both FOC and kinetic energy calculations.
Use a digital grain scale accurate to 0.1 grains. Weigh the assembled arrow (shaft + nock + fletching + insert + point) for total weight to use in the archery kinetic energy calculator and foc calculator. The arrow energy calculator uses total arrow weight in grains, not ounces or grams.
What FOC means in archery: FOC stands for Front of Center. It describes the balance point location of an arrow as a percentage of total arrow length, measured from the nock end. What is FOC in archery practically means: how nose-heavy is your arrow? Higher FOC = more weight toward the tip = more stable, slower arrow. Lower FOC = more neutral balance = faster, flatter-shooting arrow.
FOC does not directly change arrow speed — the bow's draw weight and draw length determine speed. However, heavier tips (increasing FOC) add arrow weight, which reduces fps. Use the arrow FOC calculator and arrow KE calculator together: a heavier tip increases FOC and kinetic energy even if speed drops slightly, because the weight gain outpaces the speed loss in the KE formula.
Enter your arrow length, balance point distance from the nock, arrow weight, and arrow speed into the arrow foc calculator above. The foc calculator automatically computes your FOC % and displays which archery range it falls into. For calculate foc arrow manually: FOC % = (balance point ÷ total arrow length) × 100.
The f.o.c. calculator formula: FOC % = (Distance from Nock to Balance Point ÷ Total Arrow Length) × 100. This formula is used by every foc calculator, foc calc, foc calculator archery, and archery foc calculator tool — including Gold Tip, Easton, podium archery, and ranch fairy setups.
To calculate arrow FOC: (1) Find the balance point. (2) Measure nock-to-balance-point distance. (3) Divide by total arrow length. (4) Multiply by 100. That's how to calculate FOC on an arrow. This is what every calculating arrow foc and calculate foc arrow guide recommends. The foc calculator arrow above does this instantly.
The archery kinetic energy calculator (also arrow kinetic energy calculator, arrow ke calculator, bow and arrow kinetic energy calculator, archery ke calculator) computes: KE = (grain weight × fps²) ÷ 450,240. This kinetic energy calculator for arrows result is in foot-pounds (ft-lbs), the standard unit for hunting arrow energy.
The podium archery foc (or podium foc calculator, foc calculator podium, podium archery calculator) calculates front of center for Podium brand arrows. The archery foc calculator on this page works for Podium arrows — just enter your Podium arrow's length and balance point.
The ranch fairy foc calculator is a tool for calculating high-FOC bowhunting setups promoted by Ranch Fairy. Typical ranch fairy targets are 15–30%+ FOC for maximum penetration. Use the arrow foc calculator above — enter your heavy broadhead weight (100–200+ gr) and find your balance point to get your ranch fairy FOC %.
The foc calculator gold tip and Easton FOC calculator both use the same formula as this arrow foc calculator. Brand-specific tools just pre-load arrow length values from their product lines. This foc calculator archery works for Gold Tip, Easton, Carbon Express, Black Eagle, and all other brands.
A typical arrow weighs 300–600 grains total. How much does an arrow weigh depends on shaft material/diameter, broadhead (75–150 gr), nock (8–15 gr), and fletching (10–25 gr). Use your total arrow weight (grains) as input for the arrow ke calculator and arrow foc calculator above.
An arrow spine calculator determines correct shaft stiffness for your bow. Enter bow draw weight, draw length, and point weight. Brands like Victory (victory spine calculator, victory archery spine calculator) and Easton provide spine charts. The recurve arrow spine calculator adjusts for lighter draw weights. Spine selection works hand-in-hand with the foc calculator — proper spine ensures your high-FOC arrow flies correctly.
An arrow ballistics calculator models your arrow's trajectory, drop, drift, and remaining velocity at various distances. Combined with the arrow foc calculator and arrow kinetic energy calculator, it gives a complete picture of your arrow's downrange performance. The bow sight pin gap calculator also uses ballistic data to set pin gaps for multi-pin sights.