Rifle Scope Click Adjustment Calculator (MOA & MRAD)
Convert scope clicks (MOA or MRAD) to inches or centimeters at any distance, so you can dial the exact adjustment to zero your rifle.
Rifle scope adjustments are made by turning turrets that move the reticle in small increments. These increments are measured in MOA (Minute of Angle) or MRAD (Milliradians).
MOA — Minute of Angle:
1 MOA = 1/60th of a degree of angle. At 100 yards, 1 MOA = 1.047 inches (commonly rounded to 1 inch for simplicity). At 200 yards, 1 MOA = ~2.094 inches. At 300 yards, ~3.14 inches. And so on.
Inches at distance = MOA × (distance in yards / 100) × 1.047
Most scopes have 1/4 MOA clicks — meaning each click moves point of impact 0.25 MOA. At 100 yards: 1 click = 0.262 inches. To move 1 inch at 100 yards you need 4 clicks.
MRAD (Milliradians / Mil):
1 MRAD = 1/1000 of a radian. At 100 meters, 1 MRAD = 10 cm (exactly, by definition). At 100 yards, 1 MRAD = 3.6 inches.
Centimeters at distance = MRAD × (distance in meters / 100) × 10
Most MRAD scopes have 0.1 MRAD clicks. At 100 meters: 1 click = 1 cm. Very intuitive for metric shooters.
Common click values:
| Scope Type | Click Value | At 100 yd/m |
|---|---|---|
| 1/4 MOA | 0.25 MOA | 0.262" at 100 yd |
| 1/8 MOA | 0.125 MOA | 0.131" at 100 yd |
| 0.1 MRAD | 0.1 mil | 1 cm at 100 m |
| 0.25 MRAD | 0.25 mil | 2.5 cm at 100 m |
How to calculate clicks needed:
- Shoot a group and measure how far off center it is
- Divide the offset by the click value at that distance
- Round to the nearest whole click
Example (MOA scope): You’re shooting at 200 yards. Your group is 3 inches low and 1.5 inches right.
- Vertical clicks needed: 3 ÷ (0.25 MOA × 2) = 3 ÷ 0.524 = 6 clicks UP
- Horizontal clicks needed: 1.5 ÷ (0.25 MOA × 2) = 3 clicks RIGHT
Tip: Shoot 3–5 round groups, not single shots, to average out shooter error. Always confirm your zero with a follow-up group after adjustments.
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