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Calcimator

External Ballistics Calculator

Calculate bullet trajectory from muzzle velocity, ballistic coefficient, and environmental conditions. See drop, velocity, and energy at range.

Inputs

fps
gr
yds
yds
in
°F
ft

Results

Drop at Target

-37.6 in

Velocity at Target2,415 fps
Energy at Target2,176 ft-lbs
Time of Flight0.58 s
Muzzle Energy2,822 ft-lbs
How to Use This Calculator
  1. Enter Muzzle Velocity, Ballistic Coefficient (G1), and Bullet Weight.
  2. Set Zero Range, Target Range, and Sight Height.
  3. Adjust Temperature, Altitude as needed.
  4. Review the Drop at Target (in) result.
  5. Use Velocity at Target (fps) and Energy at Target (ft-lbs) to inform your decision.

How the result changes with Target Range

Target RangeDrop at Target
245-0.4 in
733-108.3 in
1,318-494.3 in
1,805-1,070.1 in

What each input means

Muzzle Velocity
Bullet speed at the muzzle in feet per second.
Ballistic Coefficient (G1)
G1 ballistic coefficient from bullet manufacturer data.
Bullet Weight
Bullet weight in grains.
Zero Range
Distance at which the rifle is zeroed.
Target Range
Distance to the target.
Sight Height
Height of scope center above bore center.
Temperature
Ambient temperature in Fahrenheit.
Altitude
Elevation above sea level.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Muzzle Velocity = 2750, Ballistic Coefficient (G1) = 0.45, Bullet Weight = 168, Zero Range = 100 = 8 input(s) provided
  2. Calculate Drop at Target
    -37.6 = -37.6
  3. Calculate Velocity at Target
    2415 = 2415
  4. Calculate Energy at Target
    2176 = 2176

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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