Use this binocular range calculator to estimate distance with mils. Enter the target height and the mil reading to calculate range in meters. This mil-dot range calculator is useful for observation, surveying, wildlife watching, marine use, and general optics work.
Last updated: April 2026 | By Patchworkr Team
| Target Height | Mils | Range |
|---|---|---|
| 1.5 m | 3 | 500 m |
| 1.8 m | 2 | 900 m |
| 2 m | 4 | 500 m |
| 2 m | 1 | 2000 m |
| 3 m | 6 | 500 m |
| 10 m | 5 | 2000 m |
A binocular range calculator estimates the distance to a target using its known height and its size in mils through a reticle. It is often called a mil-dot range calculator because it uses the mil relation to work out the distance.
This method is useful when you know or can estimate the target size. If you know how tall the object is and how many mils it spans, you can calculate range quickly without needing electronic distance tools.
This makes the binocular range calculator useful for field observation, wildlife spotting, coastal work, boating, optics practice, and surveying tasks where a quick distance estimate is enough.
The standard formula is:
A mil is an angular unit. In simple field terms, 1 mil covers about 1 meter at 1000 meters. That is why multiplying by 1000 works in this formula when target height is entered in meters.
Standard System
This calculator uses the NATO mil standard (1 mil = 1/1000 radian). Some optics use different mil systems (e.g., 1/6400 circle). Always verify your binocular's specification to ensure accurate results.
The smaller the mil reading, the farther away the target usually is. The larger the mil reading, the closer the target usually is.
Estimating the distance to a standing person
This is why a binocular range calculator can be useful in the field. Once you know the target size and the mil reading, the calculation is quick.
The formula only works as well as your target size estimate. A poor height estimate will shift the result.
Small errors in mil reading can create big distance errors, especially when the mil number is low.
This calculator uses meters for target height and meters for the result. Convert other units first.
Heat haze, angle, posture, partial visibility, and reading error can all affect the answer.
Estimate the target height, measure the target in mils, then use the formula: distance = (target height × 1000) ÷ mils.
A mil is an angular measurement used in optics. In simple field use, 1 mil covers about 1 meter at 1000 meters.
The common formula is distance in meters = (target height in meters × 1000) ÷ mils.
Yes. It can be used anywhere you know or can estimate the target size and can read the mil value.
Because the target appears smaller in the reticle. If the real target size is the same, a smaller angular size usually means greater distance.
No. It is an estimate. The accuracy depends on target height, reticle reading, and field conditions.
Mil-dot ranging is a practical field estimate, typically accurate within 5-10% at moderate distances (500-1000m). Laser rangefinders are more precise but require power and equipment.
Yes, but convert consistently. If you enter target height in feet, you must know that the formula will output distance proportionally in similar units.
This binocular range calculator uses a simple mil-dot formula to estimate distance. Enter the target height in meters, enter the mil reading, and calculate the range. It is a practical optics tool for fast field estimates when you do not need a laser reading.
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