MOA / MIL Scope Click Adjustment Calculator
Turn a miss measured on the target, or read in your reticle, into scope clicks for ¼ MOA, ⅛ MOA, ½ MOA, 1 MOA, 0.1 mil or 0.05 mil turrets. Handles true MOA or inch-per-100-yard turrets, and shows the leftover error after rounding, turret turns, group size in MOA and mil, and the size of one MOA, one mil and one click at any distance.
How it works
1 MOA = 1.047″ per 100 yd (2.909 cm/100 m); 1 IPHY = 1.000″ per 100 yd; 1 mil = 3.6″ per 100 yd (10 cm/100 m); clicks = miss ÷ (unit size at range × click value); reticle reading: clicks = reading ÷ click value (same unit); 1 mil = 3.438 MOA
Scope turrets move the reticle in angular units, so the linear correction at the target depends on distance. A minute of angle covers 1.047 inches at 100 yards and twice that at 200; a milliradian covers 3.6 inches at 100 yards, which is 10 cm at 100 m. You can give the miss two ways. Measure it on the target in inches or centimetres, and the calculator divides it by the size of one click at that range. Or hold the crosshair on the aim point and read the miss off the reticle marks, which needs no distance at all when reticle and turret use the same unit. The adjustment is always opposite to the miss: shots that land low need the reticle moved up. The result shows clicks for elevation and windage, the same correction in the other unit, and how far off you still are after rounding to whole clicks. Optionally it also gives turret turns and your group size in MOA and mil. Some scopes click a quarter inch at 100 yards (IPHY) instead of a quarter MOA. That 4.5% difference matters at long range, and turrets can be off from their marked value, so verify them with a tall-target test before dialling far.
Worked example
A group 2.5″ low and 1.5″ right at 100 yards with a ¼ MOA turret: 1 MOA there is 1.047″, so the correction is 2.39 MOA up and 1.43 MOA left. That is 9.5 and 5.7 clicks, rounded to 10 clicks up and 6 left, leaving about 0.12″ and 0.07″ after rounding. In mils that is 0.69 up and 0.42 left, or 7 and 4 clicks on a 0.1 mil turret. If instead you read the miss in a mil reticle as 0.7 mil low and 0.4 mil right, a 0.1 mil turret needs 7 clicks up and 4 left at any distance.
Frequently asked questions
MOA or mil — which is better?
Neither. Mils pair with metric thinking and mil reticles (one 0.1 mil click moves 1 cm at 100 m), MOA with inches. What matters is that reticle and turret use the same unit, so you can read a miss in the reticle and dial it straight in.
How many clicks is 1 inch at 100 yards?
About 3.8 clicks on a ¼ MOA turret (each click is 0.262″), 7.6 on a ⅛ MOA turret and 2.8 on a 0.1 mil turret (0.36″ a click). At 200 yards each click moves twice as far, so you need half as many clicks.
Why did my correction land short of the mark?
Turret error (test it), a scope that is not level, parallax, or a group too small to know its true centre. Fire 3–5 shots and correct to the centre of the group, not to a single shot.
What is IPHY or shooter’s MOA?
Inches per hundred yards: one unit is exactly 1.000″ at 100 yards instead of 1.047″. A few scope makers use it for their MOA turrets. Switch on the IPHY option under More options if your manual says each click is ¼ inch at 100 yards.
How do I measure the miss in the reticle?
After the shot, hold the crosshair on your original aim point and see which reticle mark lines up with the bullet hole. If it sits 0.5 mil below centre, dial 0.5 mil up, which is 5 clicks on a 0.1 mil turret. You do not need the distance when the reticle and turret use the same unit.
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Sport-shooting and hunting arithmetic from standard published formulas (SAAMI energy, Miller stability, free-recoil energy). Follow all range rules and local law; verify every zero and correction on paper at the range — calculators inform, they do not replace live confirmation.