Mil-Dot Reticle Explained: How to Range and Hold
You dial your ATRO-20 to 10× and spot a target at an unknown distance — no rangefinder on your hip, wind ticking from the right. The mil-dot reticle in front of you is not just a crosshair with decorations; it is a built-in ranging and holdover tool that, once understood, lets you solve that shot using geometry. A mil-dot reticle uses the milliradian (mrad) as its unit of measure, with each dot subtending 1 mil — equal to 10 cm at 100 m (or approximately 3.6 inches at 100 yards) — so you can estimate range from a known object size and hold for wind or elevation without touching the turrets.
Key takeaways
- 1 milliradian (mil) = 10 cm at 100 m, or ≈ 3.6 in at 100 yd — this ratio scales linearly with distance.
- The ranging formula is: Range (m) = Target size (m) × 1000 ÷ Mils read in the reticle.
- On a first focal plane (FFP) scope, mil subtensions stay constant at every magnification — critical for accurate ranging and holdover at any power setting.
- Both Accufire rifle scopes — the EVRO-12 ($479) and ATRO-20 ($649.25) — are FFP with mil reticles and 0.1 mrad clicks, so the reticle and turrets speak the same language.
- Matching turret units to reticle units is non-negotiable: a mil reticle with MOA turrets requires a conversion factor on every shot, introducing a real source of error under pressure.
What a milliradian actually measures
A radian is the angle at which an arc equals the radius of a circle. One milliradian is one-thousandth of that — roughly 0.057°. In practical shooting terms, 1 mil subtends exactly 1 meter at 1,000 meters, which scales down neatly: 10 cm at 100 m, 20 cm at 200 m, 50 cm at 500 m. In yards, 1 mil subtends 3.6 inches at 100 yd (some sources round to 3.438 in for a true mathematical mrad; 3.6 in is the commonly used practical approximation). The linear scaling is the whole point — double the distance, double the subtension in real-world inches or centimeters. For a deeper look at how MOA and MRAD compare as adjustment systems, the MOA vs MRAD guide covers the trade-offs in full.
Traditional mil-dot reticles space their dots at 1-mil intervals, with each dot itself subtending 0.2 mil (the gap between dot edges is 0.8 mil, center-to-center is 1 mil). More modern mil-hash or open-mil reticles use thin hash marks at half-mil or 0.2-mil intervals for finer holdover points without cluttering the sight picture. Regardless of style, the unit of measure — the milliradian — is the same.
How to range a target with the reticle
The ranging formula is straightforward:
| Formula version | Equation | Example |
|---|---|---|
| Metric (meters) | Range (m) = Target size (m) × 1,000 ÷ Mils | 0.5 m target reads 2 mils → 250 m |
| Imperial (yards) | Range (yd) = Target size (in) × 27.78 ÷ Mils | 18 in target reads 2 mils → 250 yd |
Walk through the metric version: you know the steel target stands 0.5 m tall. Through the scope it spans 2 mil-dots. Plug in: 0.5 × 1,000 ÷ 2 = 250 m. The math works at any magnification on an FFP scope because the reticle grows with the image — read 2 mils at 5× or at 20× and you get the same answer. On a second-focal-plane (SFP) scope the reticle subtensions are only calibrated at one specific magnification (usually maximum), so you must be on that power to range correctly. This is one reason precision shooters gravitate toward FFP designs like the first-focal-plane format.
Ranging accuracy depends on knowing the target's true size. A rough measurement introduces a proportional error — if you're off by 10% on target size, you're off by 10% on range. A dedicated rangefinder remains more reliable for precise long-range work. The reticle method shines when no rangefinder is available, or as a fast sanity-check against your rangefinder reading.
Holdover: dialing versus holding
Once you have your range, you have two paths to account for bullet drop and wind drift: dial the turrets to shift the reticle's zero, or hold a point in the reticle above or to the side of the target. Mil-reticle shooters use both techniques, sometimes in combination.
Dialing means turning the elevation turret a calculated number of clicks. On Accufire's EVRO-12 and ATRO-20, each click moves point of impact 0.1 mrad. To move 1 full mil of elevation you turn 10 clicks. If your ballistic data says you need 2.5 mil of elevation correction at 500 m, that is 25 clicks up — straightforward arithmetic. The EVRO-12 adds locking turrets so the zero cannot be bumped accidentally during carry or vehicle transport, which is a real practical advantage for field work.
Holding means keeping the turrets at your original zero and using a sub-tension point below the center crosshair as your aiming point for longer ranges, or holding into the wind on the horizontal stadia. This is faster than dialing — no turret movement between shots — and is the technique most useful in dynamic situations where range is changing or multiple targets are engaged at varying distances. A pre-built dope card (drop-in-mils at each distance) attached to the stock or stored in a phone makes holdover practical without mental arithmetic under pressure.
Honest tradeoff: holdover introduces a fine-motor skill requirement. Holding precisely on the 2.3-mil mark in a reticle with only full-mil hash marks requires interpolation by eye. Dialing is more precise but slower. Most serious long-range shooters dial for single known-distance shots and hold for rapid-fire or unknown-distance strings. For a broader look at how to count clicks and shift your zero correctly, the rifle scope adjustment guide walks through the turret mechanics step by step.
Why matching reticle and turret units matters
This is the most common source of mechanical error for shooters transitioning to precision optics. A mil reticle with MOA turrets means every mental calculation must include a conversion: 1 mil = 3.438 MOA. Under range conditions, that conversion introduces mistakes. The clean solution is to keep reticle and turrets in the same unit — both mil, or both MOA.
Both Accufire scopes are mil/mil: the reticle marks in milliradians and the turrets adjust in 0.1-mrad increments. If your holdover calculation says 1.5 mils of elevation, you dial 15 clicks. No conversion. This is the configuration precision-rifle competitors and military shooters standardized on, and it is the reason "mil/mil" is explicitly sought in scope specifications. Accufire makes no scope with MOA turrets, so there is no risk of a mixed-unit configuration if you stay within their lineup.
The ATRO-20 and EVRO-12: mil reticles in practice
Both Accufire rifle scopes run a first-focal-plane mil reticle with 0.1 mrad clicks on a 30 mm tube, with side-focus parallax from 50 yd to infinity and eye relief of approximately 3.22–3.5 inches. The EVRO-12 ($479) positions itself as an essential-tier option with locking turrets. The ATRO-20 ($649.25, part of the Prospectis line) is the advanced-tier version of essentially the same optical configuration, aimed at shooters who want a step up in build quality and finish on the same FFP mil platform.
A candid note on limitations: Accufire makes no second-focal-plane scope, no 1× LPVO, and no dedicated magnifier. If you need true 1× true-sight for close-quarters with a flip to magnified, the EVRO and ATRO both start at 2.5×, not 1×. They are purpose-built magnified precision scopes, not do-everything carbine optics. For the mil-dot application — deliberate mid-to-long range work with holdover or dialing — the FFP format is the right call and both scopes deliver it.
Ready to put mil-dot math to use? Both Accufire rifle scopes are first focal plane, mil reticle, 0.1 mrad clicks — built for exactly this kind of deliberate precision work — shop the rifle scope collection.
Accufire ATRO-20 Advanced Tactical Rifle Scope — $649.25, FFP 2.5–20×50 with mil reticle and 0.1 mrad clicks on a 30 mm tube. View the ATRO-20.
Frequently asked questions
What does 1 mil equal in inches and centimeters?
1 mil equals 10 cm at 100 m, or approximately 3.6 inches at 100 yards. The subtension scales linearly: at 200 m it equals 20 cm, at 500 m it equals 50 cm. This consistent scaling is what makes the milliradian useful for both ranging and holdover calculations.
Can I use a mil reticle at any magnification on an FFP scope?
Yes. On a first focal plane scope the reticle scales with the image, so 1 mil in the reticle always equals 1 mil of real-world subtension regardless of the power setting. On a second focal plane scope the subtensions are only accurate at one calibrated magnification, typically maximum power. Both Accufire rifle scopes are first focal plane.
What is the mil ranging formula?
In metric: Range in meters equals target size in meters multiplied by 1,000, divided by the number of mils the target spans in the reticle. For example, a 0.5 m tall target that spans 2 mils is 250 m away. In imperial: Range in yards equals target size in inches multiplied by 27.78, divided by mils.
Should I dial turrets or hold using the reticle for elevation corrections?
Both methods are valid. Dialing is more precise for a single shot at a known distance because you simply count clicks on 0.1 mrad turrets. Holding is faster when engaging multiple targets at varying distances using a pre-built drop chart. Many precision shooters dial for deliberate long-range shots and hold for rapid or dynamic situations. Accufire scopes use 0.1 mrad clicks, so dialing in mil increments requires no unit conversion.
Why do the reticle and turrets need to be in the same unit?
If your reticle is marked in mils but your turrets adjust in MOA, every correction requires converting between units (1 mil equals 3.438 MOA). That conversion introduces arithmetic errors, especially under pressure. Keeping both in mils means a 1.5 mil holdover translates directly to 15 clicks of elevation — no math needed beyond your ballistic data.
Understanding the mil-dot reticle unlocks a level of field capability that no amount of turret spinning can replace when a rangefinder is unavailable or time is short. If you are still deciding between MOA and MRAD as a system, the MOA vs MRAD comparison lays out both cases objectively. For a broader foundation on how rifle scope optics work together — parallax, eye relief, focal plane, reticle type — the complete rifle scope guide is the right starting point.