Each record keeps its original units and speed source. Include or exclude records explicitly. Setup summaries are separate; estimated speeds are never pooled with measured speeds.

Illustrative example: 400 grains, 300 fps.
Mass 0.025919564 kg; speed 91.44 m/s.
Energy = ½mv² = 108.3602830983552 J.
Momentum = mv = 2.37008493216 kg·m/s.

Energy E = ½mv², momentum p = mv. Internally mass is kilograms and speed metres per second. One grain is exactly 0.00006479891 kg; one foot is 0.3048 m. One pound-force is 0.45359237 × 9.80665 N. Results use these definitions rather than rounded customary-unit divisors.

For repeats, calculate energy for each shot, then average those energies. Energy from the average speed is generally different. Sample standard deviation uses n − 1; it is unavailable for one record. Identical values have zero observed scatter. Scatter does not include instrument or calibration error. Different setups and estimated speeds are summarized separately. No records are automatically discarded.

Supported computational range: mass 0.000001–10000 g and speed 0.000001–10000 m/s. These bounds do not describe safe equipment. Display digits are arithmetic precision, not measurement accuracy. The journal has at most 100 records and exists only in this tab; export it before leaving.

• Easton: finished mass and chronograph speed
• NIST conversion factors