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Ballistic calculator: the firing solution for your target distance

How many clicks for 300 yards, and how much wind for 10 mph from the left? Enter the data for your load and the calculator gives you the correction in mrad, MOA and clicks.

  • Updated
  • 3 min read

Get a firing solution #

The calculator runs in your browser. What you enter stays on your device: this page doesn’t send it anywhere and doesn’t store it.

Units
Drag model

G7 for modern boat-tail bullets (match/long range), G1 for classic flat-base and hunting bullets. Always enter the BC that matches the selected model.

in lb/in², as stated by the manufacturer

Positive = wind from the left (drift to the right), negative = wind from the right. Full crosswind, 90° to the line of fire.

Turret click value

This page needs JavaScript to do the math. It runs only in your browser.

Default: ICAO standard atmosphere — 59 °F, 29.92 inHg, sea level. Good enough for most shots.

What the calculation is based on: ICAO standard atmosphere (59 °F, 29.92 inHg), G1 and G7 drag functions, point-mass model with fourth-order Runge–Kutta integration. U.S. Standard Atmosphere 1976 (NASA)

The Waffenschrank app works out the same firing solution at the range, even offline.

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How the calculator works #

It uses the point-mass model, the same one the app uses. The bullet flies through the ICAO standard atmosphere and slows down according to the drag function your BC belongs to, G1 or G7. The line of sight is level, and the wind is a full-value crosswind.

From your zero range it finds the launch angle at which the trajectory crosses the line of sight at that distance. With that angle it runs the trajectory out to the target and gives you drop, drift and the correction to dial on the turret.

If your numbers can’t be zeroed at that distance at all, say an air rifle at 300 yards, it tells you so instead of showing a solution that isn’t one.

Mrad or MOA? #

Both are angles. One milliradian (mrad, or “mil”) is 3.6 inches at 100 yards, or 10 cm at 100 m. One minute of angle (MOA) is about 1.047 inches at 100 yards, just over an inch, or roughly 2.9 cm at 100 m. Your scope’s turrets tell you which one you need.

The number of clicks depends on the turret’s click value. The most common are 0.1 mrad and 0.25 MOA. The calculator rounds to whole clicks.

What it doesn’t do #

On this page the calculator uses the standard atmosphere at sea level. Your own weather data, the altitude of your range and the full trajectory as a table are in the app with Waffenschrank Pro.

Non-binding calculation under standard conditions: point-mass model with standard drag function, horizontal line of sight, constant crosswind, no up- or downdrafts, no spin drift, no Coriolis effect. Differences from barrel, lot and weather are normal — these values are no substitute for zeroing or your own DOPE. Always verify your holds at the range.

For your club website or a forum post: copy the line and paste it in. It’s a plain link, with no script and no tracking pixel.