basic

Boxing Punch Kinetic Energy from Mass and Fist Speed Calculator

KE = ½ m v².

Compute the peak kinetic energy of a punch: KE = ½ · m_eff · v², where m_eff is the effective striking mass (glove + forearm + partial upper arm; typically 4–8 kg) and v is the fist velocity at impact. Also reports the average force if impact duration is given: F_avg = KE / (½ · v · t_contact).

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

kg
m/s
s

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

KE = ½ m v²; F_avg ≈ KE / (½·v·t).

In depth

Compute the peak kinetic energy of a punch: KE = ½ · m_eff · v², where m_eff is the effective striking mass (glove + forearm + partial upper arm; typically 4–8 kg) and v is the fist velocity at impact. Also reports the average force if impact duration is given: F_avg = KE / (½ · v · t_contact).