Boxing punch power calculator
Impact force is the effective striking mass times the change in speed over the contact time (F = m·v/t); the punch also carries momentum m·v and kinetic energy ½·m·v². Enter the mass behind the fist, the fist speed and the contact time.
Related tools
All Running & endurance tools →Enter Effective striking mass (kg), Fist speed (m/s), Contact time (ms) and the Boxing punch power calculator works out Impact force (N), Impact force (lbf), Kinetic energy (J), Momentum (kg·m/s) straight away. For instance, with Effective striking mass (kg) = 6, Fist speed (m/s) = 9 and Contact time (ms) = 15 it returns Impact force (N) = 3,600, Impact force (lbf) = 809.312 and Kinetic energy (J) = 243.
How to use it
- Enter your values: Effective striking mass (kg), Fist speed (m/s), Contact time (ms).
- Read the result instantly: Impact force (N), Impact force (lbf), Kinetic energy (J), Momentum (kg·m/s).
Frequently asked questions
What does the Boxing punch power calculator actually compute?
It takes Effective striking mass (kg), Fist speed (m/s) and Contact time (ms) and derives Impact force (N), Impact force (lbf), Kinetic energy (J) and Momentum (kg·m/s) from them. The calculation is live as you type, so the result updates on every change.
What information do I need to provide?
3 values: Effective striking mass (kg), Fist speed (m/s) and Contact time (ms). Nothing else is required — no account, no file upload.
Can you show a worked example?
With Effective striking mass (kg) = 6, Fist speed (m/s) = 9 and Contact time (ms) = 15, the calculator returns Impact force (N) = 3,600, Impact force (lbf) = 809.312 and Kinetic energy (J) = 243. Those figures come from running this exact tool, so you can reproduce them by entering the same values.
What happens if I enter larger values?
It moves a lot. Using Effective striking mass (kg) = 6.6, Fist speed (m/s) = 18 and Contact time (ms) = 30 instead, Impact force (N) goes from 3,600 to 3,960 — which is why it is worth testing a few scenarios rather than trusting a single figure.
What does it give for smaller values?
Scaled down to Effective striking mass (kg) = 5.4, Fist speed (m/s) = 4.5 and Contact time (ms) = 8, Impact force (N) comes out at 3,038. The relationship is worth checking at both ends before you rely on a single result.
When would I actually use this?
Preparing a race: the pace a target time needs, the splits to hold it, and the training zones that sit under it — on foot, and equally on a bike or in a pool, where the same session is measured in watts or in a hundred-metre split instead.
What is the most common mistake?
Scaling a time linearly to a longer distance. A marathon is not two half-marathons; race predictors use an exponent around 1.06 precisely because fatigue is not proportional.
What is the difference between the Boxing punch power calculator and the Cycling power calculator?
This one returns Impact force (N) and Impact force (lbf); the Cycling power calculator returns Power. That is the whole difference — open the one whose figure you need.
Is there a tool for the next step?
Cycling Power Zones Calculator is the closest one after this: Get your Coggan cycling power zones (Z1–Z5) from your FTP.
What else is worth having open alongside it?
Power-to-weight ratio calculator and Pace Calculator — they come up in the same task often enough to be worth a second tab.