Archery tools

Sight Tape Builder

Build and print a compound-bow sight tape using arrow speed, sight marks, and bow measurements.

Tape range

Choose the tape range, then add arrow speed or a sight mark to personalize it.

Zero distanceyardsYour tape’s alignment mark. Farthest distanceyardsEnd of the finished tape.

Add what you know

Speed is the easiest way to move beyond an average-bow preview. Open any category to add more detail; sight marks in step 2 refine the fit further.

Sight marks

Approximate marks are welcome. Each one helps personalize the starting model.

Measure from your zero mark

Measure the distance along the sight between your zero-distance indicator and another trusted yardage mark. Enter movement toward longer yardages as positive.

Example: 20-yard zero to 60-yard mark measures 18.6 mm → enter 60 yd and 18.6 mm.

Need a millimeter scale?

Print a setup tape, align its 0 with your zero mark, and read your sight travel directly. Includes both directions and half-millimeter ticks.

Setup tape paper Download mm setup tape (PDF)

Print at 100% / Actual size. Verify the two 2-inch guides with an ordinary ruler before using.

No marks yet

You can still build a prior estimate, or add the first mark below.

Choose based on the group and conditions. The fit also allows for mark-reading error and uncertainty in the shared zero mark.

Check these entries:

Hunting-condition tape: the adjustment column compares it with your sight-in setup.

Launch velocity

fps

Supported through

yards

Farthest observed sight mark

At maximum range

± in

Approximate 90% half-width

Calibration

marks

Fitted travel curve

90% credible band

Solid line: posterior median. Dashed boundary: farthest observed mark. The table below is the accessible data equivalent.

Print your tape

Generic linear-travel tape; verify direction against your sight before mounting.

Tape width (mm) Ticks face Paper

Print on the selected paper size at 100% / Actual size. Turn off Fit / Shrink.

Check that both printed guides measure 50 mm before cutting.

Other download and print options

Print SVGs at 100% and verify the included 50 mm ruler.

Trajectory & impact

See where your arrow lands with the sight held at one setting. Uses this tape’s hunting conditions and a level shot.

Add arrow weight under Arrow & launch, then rebuild your tape to include energy and momentum.

Impact height: + above / − below your aiming point. Wind drift: + right / − left.

The shaded area is the 90% model interval for arrow height. It reflects uncertainty in your fitted setup, not group size or gusts. Wind drift is an approximation using the fitted drag; yaw and broadhead lift are not modeled.

Flight path table

Range (yd)	Height (in)	90% height interval	Drift (in)

For the nerds: posterior details

Posterior summary

These parameter estimates combine your inputs with the model’s starting assumptions. The 90% interval runs from the 5th to the 95th percentile. Each row summarizes one parameter; combinations of these values are not necessarily equally plausible.

Parameter	Median	90% interval

Drag is the effective velocity-decay rate per yard. The zero-setting offset is a shared measurement-error estimate, not a tape adjustment.

How your marks compare

The estimate balances your marks, their uncertainty, and your bow measurements. It does not need to pass through every mark. This comparison uses your sight-in conditions, before any hunting adjustment.

Yards	Your mark	Estimated setting	Difference

A positive difference means the estimate calls for more sight travel than your recorded mark. All values are measured from your zero.

Model and sampling

· samples · effective samples

Effective sample size describes how evenly the weighted samples contribute; it is not a confidence score.

Assumptions and range coverage

Sight settings

Yards			Hunting 90% range	Approx. target ± in

How the sight-tape model worksSee how TagNerd combines typical bow behavior with the information you provide.