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Mil-Dot Ranger — Scope-Based Range Estimation
Questions about using Mil-Dot Ranger? Start with the FAQ below. If you don't find your answer, email us directly — we read every message.
Frequently Asked Questions
What is a mil-dot reticle and how does ranging work?
A mil-dot (milliradian) reticle has dots or hash marks spaced exactly 1 mil apart. Because one mil always covers 1/1000 of the distance to whatever you're looking at, you can measure how many mils a target spans and calculate the distance. Mil-Dot Ranger does this math for you — enter the target's known size and your reticle reading, and the app returns the range instantly. MOA (Minute of Angle) reticles work the same way with a different angular constant; the app supports both.
How do I get a range reading?
Tap the Profiles tab and select a target, or enter a target size manually on the Range tab. Then look through your scope, count how many mils (or MOA) the target covers from top to bottom, and enter that number in the reading field. The range appears instantly on the reticle image. You can also pinch the reticle to size the silhouette overlay to match your scope view — the reading and range update as you zoom.
The range looks wrong. What should I check?
Three things to verify: (1) Make sure the target size you entered matches the dimension you're measuring in the scope — for animals, this is typically chest depth, not overall body length. (2) Check that you have the correct reticle type selected (Mil vs. MOA). (3) Confirm the reticle span in Settings (⚙) matches your reticle artwork — the default is 20 mils, which matches the bundled reticle image.
What does the ± number next to the range mean?
That's the estimated uncertainty in your range reading. It assumes a typical reticle reading precision of ±0.1 mil (about half a dot subdivision). The uncertainty grows larger at longer ranges and with smaller reticle readings — a prairie dog at distance will have a much wider margin than an elk at close range. It's a reminder to treat the result as an estimate, not a precise measurement.
How do I use the inclinometer for uphill or downhill shots?
Tap the level icon (⊜) next to the angle field. Point your iPhone's top edge along the bore toward the muzzle, tilt to match your shot angle, then tap Use This Angle. The app applies the rifleman's rule — multiplying range by the cosine of the angle — and shows a corrected "hold for" distance. The inclinometer requires a real iPhone; it is not available in the Simulator.
What does the gear icon (⚙) do?
The gear icon in the top-right corner of the Range tab opens the Settings sheet. The only setting is Reticle Span — the number of mils the reticle image spans top-to-bottom. This controls how the target silhouette overlay is scaled against the reticle picture. The default is 20 mils, which matches the bundled image. If you replace the reticle image with your own artwork, count its hash marks and set this number to match. This setting does not affect the range calculation — it only affects the visual overlay.
How do I add my own target profile?
Go to the Profiles tab and tap the + button in the top-right corner. Enter a name, the target's size, choose a unit (inches, feet, yards, cm, or meters), and pick a silhouette shape. Tap Save. Your profile appears in the My Profiles section and can be selected just like a built-in profile. Swipe left to delete a custom profile.
How accurate are the built-in animal sizes?
The built-in sizes are typical approximations based on average measurements for North American game animals — they are starting points, not guarantees. A mature bull elk has a different chest depth than a young cow. For the targets you range most, measure your own references and save a custom profile with your verified size.
Does Mil-Dot Ranger need an internet connection?
No. Every part of the app — all calculations, all profiles, the inclinometer — runs entirely on your device. It works fully offline, including in the backcountry.
Can I use this app as a certified rangefinder for hunting or competition?
No. Mil-Dot Ranger is a reference tool that estimates range from the target size and reticle reading you provide. It is not a certified or calibrated ranging instrument. Range estimates depend on the accuracy of your target size and your ability to read the reticle steadily. Always verify range independently and follow all safe, lawful firearm practices.