Archery tools
Ten tools for fitting a bow and building arrows: draw length and weight, bow length, tiller, spine, arrow weight, FOC, energy, crossbow bolt weight and shot ethics. No signup, no sales pitch.
// Start with this one
Know your draw length in 30 seconds.
Every other tool here starts with it. Measure your arm span, drag the slider, and you’ll know what bow length and arrow length to shop for.
Open the calculator →01 / 03
Fit your bow
Before you buy anything. Find your size and a starting weight.
Calculator30 sec
Draw length calculatorArm span divided by 2.5. The standard shop method, and close enough to buy a bow on.Open tool →Calculator1 min
Draw weight calculatorLimbs are labeled at 28″. See what you’re actually pulling at your draw length.Open tool →Calculator30 sec
Bow length calculatorDraw length in, recurve length out, with the limbs for a 25″ riser and the string length.Open tool →Calculator2 min
Tiller calculatorTop minus bottom limb gap, judged by how you hold the string: split finger, three under or string walking.Open tool →02 / 03
Build your arrows
Spine, weight and balance (FOC), so your arrows fly straight off your bow.
Chart2 min
Arrow spine finderPick your bow, draw weight and arrow length. The chart lights up your starting spine.Open tool →Calculator2 min
Arrow weight builderAdd up point, insert, shaft and vanes to get total grains and grains per pound.Open tool →Calculator1 min
FOC calculatorHow far forward your arrow balances: measure it, or estimate it from the parts.Open tool →03 / 03
Speed & power
For when you start thinking about hunting.
Calculator1 min
Arrow energy calculatorArrow weight and speed in, energy and momentum out, placed on a game guide.Open tool →Checklist2 min
Ethical shot checkerPick the animal, set your bow and arrow, and answer two honest questions.Open tool →Checklist1 min
Crossbow bolt weight checkerYour finished bolt against your crossbow’s minimum weight, with its weight class and energy.Open tool →
