Tools

Free archery calculators that do the math behind a buying decision: your draw length from your arm span, an arrow's kinetic energy and momentum, and its front-of-center balance. Each one shows its formula and the authority it comes from.

• Draw length calculator

  Your draw length from your arm span, the first number a compound bow is fit to.

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• Kinetic energy and momentum calculator

  An arrow's kinetic energy and momentum, the two numbers behind how hard it hits.

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• FOC calculator

  An arrow's front-of-center balance, the share of its weight carried up front.

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