Automatic Watch Energy Calculator
Calculate automatic watch power reserve, winding efficiency, and mainspring energy. Understand how your mechanical watch stores and uses energy.
Power Reserve Calculator
Estimate remaining power reserve based on when you last wore or wound your watch.
Winding Efficiency Calculator
Calculate how efficiently your activity level charges your automatic watch.
Mainspring Energy Calculator
Estimate the energy stored in your watch's mainspring and daily energy consumption.
Formula
Frequently Asked Questions
How long does an automatic watch power reserve last?
Does a higher beat rate drain power faster?
How many turns to fully wind an automatic watch?
Understanding Automatic Watch Energy
An automatic watch is a marvel of mechanical engineering, converting the kinetic energy of your wrist movements into stored potential energy in the mainspring. Understanding this energy system helps you get the most out of your timepiece.
The Energy Chain
Wrist motion rotates the rotor, which winds the mainspring through a series of gears. The mainspring stores this energy as tension in a coiled spring. As the spring unwinds, it delivers energy through the gear train to the escapement, which regulates the release of energy to drive the balance wheel at a precise frequency.
Beat Rate and Accuracy
Higher beat rates generally improve accuracy because the balance wheel oscillates more quickly, making it less susceptible to external disturbances. A 4 Hz movement ticks 8 times per second (28,800 bph), while a 3 Hz movement ticks 6 times per second. However, higher beat rates consume more energy, creating a trade-off between accuracy and power reserve.