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Calcimator

Sight Tape Calculator

Calculate sight pin settings and arrow drop at various distances based on arrow speed and sight height.

Inputs

in
in
in
fps

Results

Drop at 40 yd

35.46 in

≈ 10 credit cards

Drop at 50 yd

55.4 in

≈ 9 smartphones

Drop at 20 yd8.86 in
Drop at 30 yd19.94 in
Drop at 60 yd79.78 in
How to Use This Calculator
  1. Measure your pin gap at 20 yards and 30 yards using a ruler on your sight.
  2. Enter Sight Height (arrow rest to sight pin plane in inches) and Arrow Speed in fps.
  3. Review calculated arrow drop at 20, 30, 40, 50, and 60 yards.
  4. Use the drop values to create a sight tape or reference card for field use.
  5. Rerun after any bow setup change (new arrows, draw weight adjustment) to update the tape.

How the result changes with Arrow Speed

Arrow SpeedDrop at 40 ydDrop at 50 yd
17590.77 in141.83 in
23849.08 in76.68 in
31328.37 in44.34 in
37519.77 in30.89 in

What each input means

Pin Gap at 20 yds
Measured pin gap between 20-yard and top pin.
Pin Gap at 30 yds
Measured pin gap between 30-yard and top pin.
Sight Height
Distance from arrow rest to sight pin plane.
Arrow Speed
Chronographed arrow speed in feet per second.

What each result means

Drop at 20 yd
Arrow drop in inches at 20 yards.
Drop at 30 yd
Arrow drop in inches at 30 yards.
Drop at 40 yd
Arrow drop in inches at 40 yards.
Drop at 50 yd
Arrow drop in inches at 50 yards.
Drop at 60 yd
Arrow drop in inches at 60 yards.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Pin Gap at 20 yds = 0.5, Pin Gap at 30 yds = 1.2, Sight Height = 6, Arrow Speed = 280 = 4 input(s) provided
  2. Calculate Drop at 40 yd
    Drop at 40 yd
    35.46 = 35.46
  3. Calculate Drop at 50 yd
    Drop at 50 yd
    55.4 = 55.4
  4. Calculate Drop at 20 yd
    Drop at 20 yd
    8.86 = 8.86
  5. Calculate Drop at 30 yd
    Drop at 30 yd
    19.94 = 19.94

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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