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Free archery sight pin calculator for fixed multi-pin housings. Translate arrow speed, sight-body radius, and a simple drag-adjusted drop model into millimeter spacing between pins for a ladder of yardages—then verify on the range with your exact broadhead or field point.
Last updated: April 17, 2026
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Chrono or manufacturer IBO-style estimate.
Approx. arc radius along the vertical pin track.
Lower = flatter effective path (heavy shafts, big vanes).
| Pin | Yards | Drop (in) | Step (mm) | From top (mm) |
|---|---|---|---|---|
| 1 | 20 | 5.14 | 0 | 0 |
| 2 | 30 | 11.57 | 2.72 | 2.72 |
| 3 | 40 | 20.57 | 2.72 | 5.44 |
| 4 | 50 | 32.13 | 2.72 | 8.16 |
| 5 | 60 | 46.27 | 2.72 | 10.88 |
Spacing is a vacuum-plus-drag-lump model along a single sight radius—real peep height, second-axis tilt, cam timing, and broadhead flight all change measured gaps. Paper-tune and sight in every pin on the range.
Safety:
mm spacing
Δθ × radius
Time of flight
x = 3×yards (ft)
2–8 pins
Hunting or 3D stacks
IBO-style input
Match your setup
Columns
Yards · drop · mm
Reality
Verify every pin
Defaults (280 fps, 30 in radius, 0.58 drag, 20 yd top pin, 10 yd steps, 5 pins):
≈ 2.72 mm second-pin step
From 20 → 30 yd row in the table (verify on your bow).
For each yardage in your ladder, the tool estimates how far the arrow falls below a flat line-of-sight using a constant-gravity flight time t ≈ horizontal distance divided by arrow speed, scaled by your drag lump k. That drop and the horizontal distance to the target define a small aim angle θ. The difference in θ between consecutive pins, multiplied by your sight arc radius in millimeters, gives the approximate vertical pin separation along the housing.
drop_ft = ½ g k (x_ft / v)²θ = atan2(drop_in, yards × 36)Δmm ≈ (sight_radius_in × 25.4) × (θᵢ − θᵢ₋₁)x is horizontal range in feet (3 feet per yard), v is speed in ft/s (numerically fps), g is standard gravity in ft/s².
Pair with our bow hunting arrow spine calculator for shaft selection before you lock pin gaps.
Get Custom Calculator for Your PlatformShare it with compound shooters building a new fixed-pin stack for hunting season.
Suggested hashtags: #Archery #Bowhunting #3DArchery #Sights #Calculator