Reforger Mortar Calculator
Precise Fire Support Solutions for Arma Reforger Operators
Grid X coordinate of the mortar.
Grid Y coordinate of the mortar.
Height above sea level at gun position.
Grid X coordinate of the target.
Grid Y coordinate of the target.
Height above sea level at target position.
Select propellant charge for desired distance.
800
1120
Mils
707.1
Meters
18.4
Seconds
Projected Trajectory
Visual representation of shot height vs distance relative to target altitude.
What is the Reforger Mortar Calculator?
A reforger mortar calculator is an essential tool for players of Arma Reforger who wish to provide accurate indirect fire support. Unlike direct-fire weapons, mortars require calculating the ballistic arc of a projectile to hit targets beyond the line of sight. This reforger mortar calculator automates the complex trigonometry and physics required to convert grid coordinates and altitude differences into usable fire data: Azimuth and Elevation in Mils.
Military simulation enthusiasts and tactical squads use the reforger mortar calculator to ensure first-round hits. Common misconceptions include the idea that grid distance alone is sufficient for accuracy. In reality, the reforger mortar calculator must account for altitude deltas between the gun and target, as a target on a hill requires a different elevation than one in a valley, even at the same horizontal distance.
Reforger Mortar Calculator Formula and Mathematical Explanation
The reforger mortar calculator uses the standard projectile motion equations, modified for military mils (6400 mil system). The core calculation involves finding the horizontal distance (d) and the vertical displacement (h), then solving for the launch angle (θ).
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| v | Muzzle Velocity | m/s | 50 – 250 m/s |
| d | Horizontal Distance | Meters | 100 – 4500 m |
| g | Gravity | m/s² | 9.81 |
| Δh | Altitude Difference | Meters | -500 to +500 m |
| θ | Launch Angle | Degrees | 45° to 85° |
The equation used by the reforger mortar calculator to find the angle θ is:
θ = arctan((v² ± sqrt(v&sup4; - g(gd² + 2Δhv²))) / gd)
For mortars, we always select the “plus” root to achieve a high-angle trajectory, which is standard for indirect fire support roles.
Practical Examples (Real-World Use Cases)
Example 1: Valley Suppression
An operator is positioned at (1200, 1200) at an altitude of 150m. The squad leader calls for fire on an enemy position at (1500, 1800) situated in a valley at 80m altitude. Using the reforger mortar calculator, the distance is calculated as 670.8 meters with a -70m altitude drop. The reforger mortar calculator provides an elevation of 1150 mils and an azimuth of 475 mils. This ensures the rounds land in the valley rather than hitting the ridge.
Example 2: Peak Assault
The gun is at (2000, 2000, 100m). The target is a radio tower on a peak at (2800, 2000, 250m). The horizontal distance is 800m. Because the target is 150m higher, a standard range table would fall short. The reforger mortar calculator adjusts the elevation to compensate for the climb, suggesting a Charge 2 setting for optimal hang time and impact angle.
How to Use This Reforger Mortar Calculator
- Enter your current Gun Easting (X) and Gun Northing (Y) coordinates from the map.
- Input your Gun Altitude using the contour lines or a rangefinder.
- Enter the Target Coordinates (X, Y) and Target Altitude provided by your forward observer.
- Select a Charge Level. If the target is out of range, increase the charge.
- Read the Azimuth (Mils) and Elevation (Mils) results.
- Adjust your mortar in-game to these values and fire for effect.
Key Factors That Affect Reforger Mortar Calculator Results
- Muzzle Velocity (Charge): Different propellant charges change the initial speed. Our reforger mortar calculator adjusts based on Charge 0-3 presets.
- Altitude Delta: Firing uphill requires lower elevation (closer to 800 mils) while firing downhill requires higher elevation (closer to 1600 mils).
- Air Density & Weather: While Arma Reforger’s vanilla weather effects are limited, extreme wind can cause horizontal drift not captured by a simple reforger mortar calculator.
- Dispersion: Every mortar has an inherent “spread.” The reforger mortar calculator provides the center point, but expect a 20-40m impact circle.
- Map Scale: Ensure you are using precise grid coordinates (6-digit or 8-digit) for maximum accuracy in the reforger mortar calculator.
- Projectile Type: HE (High Explosive), Smoke, and Flare rounds may have slightly different drag coefficients, though most reforger mortar calculator tools treat them as identical for gameplay balance.
Frequently Asked Questions (FAQ)
1. Why are my shots landing short using the reforger mortar calculator?
Check your altitude settings. If the target is higher than you and you haven’t entered the altitude in the reforger mortar calculator, the rounds will land short.
2. What is a “Mil” in the reforger mortar calculator?
A mil (milliradian) is a unit of angular measurement. Most military equipment uses 6400 mils to a circle, providing much finer adjustment than 360 degrees.
3. Can I use this for the 2B14 Podnos?
Yes, while the velocities differ slightly from the M29, this reforger mortar calculator uses a generalized physics model applicable to most 81mm/82mm systems in Reforger.
4. Does wind affect the reforger mortar calculator results?
Currently, this calculator does not account for wind drift. Operators should observe the first impact and “walk” the fire onto the target.
5. How do I find my coordinates for the calculator?
Use your map and compass. In Reforger, you can see your grid coordinates by hovering over your position or using a GPS tool if available.
6. What is the maximum range of the mortar?
Depending on the charge, an 81mm mortar can reach up to 4500m. The reforger mortar calculator will show “Out of Range” if your target exceeds the charge capability.
7. Why does the elevation go up to hit closer targets?
This is “High Angle” fire. A higher mil value (approaching 1600) means the tube is pointed more vertically, causing the round to travel less horizontal distance.
8. Is Charge 0 always the best for short range?
Yes, Charge 0 provides a steeper impact angle, which is better for hitting targets behind tall cover or in urban alleyways.
Related Tools and Internal Resources
- Grid Coordinate System Guide – Learn how to read 8-digit grids for the reforger mortar calculator.
- Projectile Motion Simulator – Understand the physics behind indirect fire trajectories.
- Military Bearing Converter – Convert between degrees and mils seamlessly.
- Fire Support Coordination – Tactics for integrating mortars into your platoon’s attack.
- Reforger Range Table – A static reference for quick fire missions.
- Mortar Squad Tactics – How to set up a secure FDC (Fire Direction Center).