What is the difference between MOA and MIL?

MOA (minute of angle) is 1/60th of a degree and subtends about 1.047 inches at 100 yards. MIL (milliradian) is 1/1000th of a radian and subtends 3.6 inches at 100 yards (or exactly 100 mm at 100 m). Both are angular, so the inches they cover grow with distance.

What is true MOA versus shooter's MOA?

True MOA subtends 1.047 inches per 100 yards by exact geometry. Shooter's MOA rounds this to 1.000 inch per 100 yards for easy mental math. The difference is about 4.7 percent and grows at long range, so pick the one your turret is actually calibrated to.

How are clicks calculated?

First the inches-per-unit at your distance is found by scaling the 100-yard value. The required angular correction equals your impact error divided by that figure. Dividing by your click value and rounding gives the number of clicks to dial.

Which way do I turn the turret?

If your shot landed low, dial UP; if high, dial DOWN; if left, dial RIGHT; if right, dial LEFT — you move the reticle toward the impact. The calculator tells you the direction based on what you select.

Why round to the nearest click?

Scope turrets move in fixed detents and cannot dial a fraction of a click. The tool rounds the ideal correction to the closest achievable click, which is normally well within the precision needed at practical ranges.

What is the MOA / MIL Scope Adjustment Calculator?

Free MOA and MIL scope adjustment calculator. Enter how far your shot landed from point of aim in inches, the distance, and your turret click value to get the exact number of clicks to dial. For rifle shooters zeroing and making field corrections. It runs free in your browser on Gera Tools, with nothing uploaded.

MOA / MIL Scope Adjustment Calculator

Name: MOA / MIL Scope Adjustment Calculator
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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The MOA / MIL scope adjustment calculator turns a missed group into a precise turret correction. Tell it how far your shots landed from point of aim, at what distance, and what your scope clicks in, and it returns the exact number of clicks to dial and the direction to turn.

How it works

Scope adjustments are angular, so a single click covers more inches the farther the target is. The two common units are:

MOA — 1 minute of angle subtends 1.047" at 100 yards (true) or 1.000" if your turret uses rounded shooter’s MOA.
MIL — 1 milliradian subtends 3.6" at 100 yards (or exactly 100 mm at 100 m).

To find the correction, the tool scales the 100-yard value to your distance, divides your impact error by it to get the angular correction, then divides by your click value:

inches_per_unit = base_at_100yd × (distance_yd / 100)
angle           = error_inches / inches_per_unit
clicks          = round(angle / click_value)

Worked example: zeroing at 200 yards

For example, your group lands 3 inches low at 200 yards on a scope with 1/4 MOA (0.25 MOA) per click.

One true MOA at 200 yards covers 1.047 × 2 = 2.094". The required correction is 3 ÷ 2.094 = 1.43 MOA. Dividing by your click value: 1.43 ÷ 0.25 = 5.73, which rounds to 6 clicks UP.

For a MIL scope with 0.1 MIL clicks at the same distance: one MIL at 200 yards is 3.6 × 2 = 7.2". Correction: 3 ÷ 7.2 = 0.42 MIL. Clicks: 0.42 ÷ 0.1 = 4.2, rounding to 4 clicks UP.

Common click values by system

System	Typical click value	Inches at 100 yd per click
1/4 MOA	0.25 MOA	~0.26”
1/8 MOA	0.125 MOA	~0.13”
0.1 MIL	0.1 MRAD	~0.36”
0.25 MIL	0.25 MRAD	~0.90”

Most competition and precision hunting scopes use 0.1 MIL or 1/4 MOA. Confirm the value stamped on your turret caps — the most common zeroing mistake is using the wrong click value in your math.

Practical tips for zeroing

Start close. At 25 yards many rifles will be close enough to a 100-yard zero that you can get on paper confidently, then move back to confirm and fine-tune.

Shoot a group, not a single shot. A group of three or more reveals your actual point of impact rather than a fluke; measure from the group center.

Direction rule: move the reticle toward the impact. Shot lands low — dial UP. Shot lands right — dial LEFT. This feels counterintuitive until you internalise it; the calculator shows the direction automatically.

True MOA vs. shooter’s MOA matters at distance. The ~4.7% difference between 1.047” and 1.000” per 100 yards is negligible at short range but grows meaningfully past 600 yards. Use true MOA if your scope is calibrated for it and you are shooting long.