Archery Calculators & Tools
These are Point Blank Archery’s calculators and tools, each built with the math shown openly rather than hidden in a black box. The FOC calculator, draw-length estimator, brace-height reference, arrow-spine calculator, and kinetic energy calculator are all live now.
Available now
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FOC calculator
Work out an arrow’s front-of-center (FOC) percentage from its length and balance point — with the standard formula shown, not hidden in a black box.
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Draw-length estimator
Estimate your draw length from your wingspan using the standard wingspan ÷ 2.5 rule — a starting point to confirm at full draw or with a coach.
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Brace-height reference
What brace height is, how to measure it with a bow square, and why the correct value comes from your bow’s manufacturer — not a generic chart.
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Arrow spine calculator
Why spine comes from the manufacturer’s chart, the inputs that drive it (bow type, draw weight, arrow length, point weight), and where to get the exact value.
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Kinetic energy calculator
Work out an arrow’s kinetic energy in ft-lbs from its total weight and speed — with the standard archery formula shown, not hidden in a black box.