Taylor KnockOut Calculator
How to Calculate Taylor Knock-Out Factor and Kinetic Energy
The Taylor Knock-Out Factor (TKOF) estimates a bullet's stopping power, while Kinetic Energy (KE) measures its energy. The formulas are:
\( \text{TKOF} = \frac{\text{M} \cdot \text{V} \cdot \text{D}}{7000} \)
\( \text{KE} = \frac{1}{2} \cdot \text{m} \cdot \text{v}^2 \)
Where:
- \( \text{M} \): Mass in grains (converted from kg, g, oz, lb, or gr).
- \( \text{V} \): Velocity in feet per second (converted from m/s, km/s, mph, in/s, or ft/s).
- \( \text{D} \): Diameter in inches (converted from mm, cm, in, or ft).
- \( \text{m} \): Mass in kilograms (converted from various units).
- \( \text{v} \): Velocity in meters per second (converted from various units).
- \( 7000 \): Conversion factor for grains to pounds.
Enter the mass, velocity, and diameter with their respective units to calculate TKOF and KE in both Joules and ft-lbf.
Using the Taylor Knock-Out Factor Calculator
This calculator evaluates bullet effectiveness by computing TKOF and KE for ballistic analysis.
Input the mass, velocity, and diameter with their units. The calculator will display the TKOF and KE in Joules and ft-lbf.
Example: Calculate for 180 gr, 2500 ft/s, 0.308 in.
- Mass: \( 180 \, \text{gr} \approx 0.01166 \, \text{kg} \)
- Velocity: \( 2500 \, \text{ft/s} \approx 762 \, \text{m/s} \)
- Diameter: \( 0.308 \, \text{in} \)
- TKOF: \( \frac{180 \times 2500 \times 0.308}{7000} \approx 19.83 \)
- KE: \( \frac{1}{2} \times 0.01166 \times 762^2 \approx 3384.54 \, \text{J} \approx 2496.33 \, \text{ft-lbf} \)
- Result: TKOF ≈ 19.83, KE ≈ 3384.54 J, ≈ 2496.33 ft-lbf
Use this tool for firearm and ammunition evaluation.
Common TKOF and KE Table
The following table provides TKOF and KE values for common bullet configurations (converted to standard units):
| Mass (gr) |
Velocity (ft/s) |
Diameter (in) |
TKOF |
KE (J) |
KE (ft-lbf) |
| 150 |
2000 |
0.308 |
13.11 |
2158.78 |
1591.85 |
| 180 |
2500 |
0.308 |
19.83 |
3384.54 |
2496.33 |
| 200 |
2200 |
0.357 |
27.81 |
3470.94 |
2560.06 |
| 230 |
2400 |
0.451 |
35.68 |
4755.72 |
3507.68 |
| 300 |
2000 |
0.500 |
42.86 |
4329.60 |
3193.60 |
Use this table for quick lookups or to verify calculator results.
Common FAQ
Below are frequently asked questions about the Taylor Knock-Out Factor and Kinetic Energy:
- Q: What does TKOF measure?
A: TKOF estimates a bullet's stopping power based on mass, velocity, and diameter.
- Q: How is KE calculated in Joules and ft-lbf?
A: KE is \( \frac{1}{2} \cdot \text{m} \cdot \text{v}^2 \), with mass in kg and velocity in m/s for Joules, then converted to ft-lbf (1 J = 0.737562 ft-lbf).
- Q: Why are unit conversions needed?
A: The formula requires consistent units (grains, ft/s, inches for TKOF; kg, m/s for KE), so inputs are converted internally.
- Q: How accurate is this calculator?
A: The calculator uses precise conversion factors and rounds results to 2 decimal places, depending on accurate input values.
- Q: Can this be used for any bullet?
A: Yes, as long as mass, velocity, and diameter are provided in any supported unit, the calculator applies to any bullet.
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