Tools

Archery calculators & tuning tools

Free. Calculate your setup, explore how your bow works, and check your shooting form.

These are the interactive helpers behind the guides. They take your actual setup — draw weight, draw length, arrow components, measured sight marks — and return numbers specific to your bow instead of a manufacturer average.

The 3D draw cycle explorer brings the mechanics to life with an illustrative bow model, and the form check rates your shooting form from one photo. The calculators need no account and remember your inputs in this browser; the form check shows a preview signed out and the full report with a free account.

The tools

Archery form check
Upload a photo at full draw. An AI model rates ten parts of your form, from stance and bow arm to anchor and draw length, and lists what to fix first, with a drill for each.
3D draw cycle explorer
Rotate a compound bow, scrub through the draw, and follow an illustrative force curve. Explore the cams, limbs, string, and release in slow motion.
Arrow Lab: arrow build calculator
Enter your bow setup and arrow components. Returns total weight, FOC%, kinetic energy, momentum, estimated speed, penetration index, and a recommended spine.
Arrow spine chart & calculator
The spine your compound bow needs from draw weight, arrow length, point weight and bow speed, with every adjustment shown and the full chart by draw weight and arrow length.
Arrow speed calculator
Estimate your arrow's real speed from the bow's IBO rating, your draw weight and length, arrow weight and string accessories, with every step shown and the gap your bow's brand measured.
Arrow FOC calculator
Work out front of center from your arrow's components or a measured balance point, see where it balances, and the point weight that reaches 10, 12 or 15% FOC.
Arrow kinetic energy calculator
Kinetic energy and momentum from your arrow's weight and a chronographed or IBO-estimated speed, out to 60 yards, with how far your arrow keeps the minimum cited for each kind of game.
Draw length calculator
Your draw length from your wingspan or height, rounded to a bow setting, and the arrow length that goes with it, with a draw length chart and an arrow length chart.
Sight tape generator
Generate a printable single-pin sight tape from a few zeroed pin distances. Calibration-fitted to your real trajectory, and it prints at true 1:1 scale.
Presets: HHA · Spot Hogg · Black Gold
Paper tuning helper
Pick the tear you actually shot and get the rest, nock-point, cam-lean, or spine adjustment that closes it, with the schematic in front of you.
Broadhead tuning helper
Pick your broadhead-vs-field-point impact pattern and get the adjustment that brings the two groups together before season.

Which one do I need?

Choose a tool for what you want to explore:

Checking your shooting form: Archery form check
Understanding how a compound bow works: 3D draw cycle explorer
Speccing or comparing an arrow build: Arrow Lab: arrow build calculator
Choosing a shaft spine: Arrow spine chart & calculator
Working out how fast your arrow really flies: Arrow speed calculator
Checking or raising your arrow's FOC: Arrow FOC calculator
Checking your arrow has enough for the game you hunt: Arrow kinetic energy calculator
Choosing a bow's draw length or cutting arrows: Draw length calculator
Making a tape for a movable-pin sight: Sight tape generator
You shot a tear and need the fix: Paper tuning helper
Broadheads don't hit with field points: Broadhead tuning helper