Clock Repair Calculators
Free clock repair calculators for pendulum length, gear ratios, mainspring sizing, and escapement timing.
Tools for horologists and clock enthusiasts.
Clock Pivot Bushing Wear Tolerance
Determine when a clock pivot hole needs re-bushing. Compares measured hole size to acceptable wear, with replacement bushing size selection.
Clock Wheel Tooth Count Calculator
Calculate the gear tooth count needed for any output RPM ratio in a clock train. Useful for replacement wheels, train design, and verifying restoration.
Quartz Watch Battery Life Calculator
Estimate quartz watch and clock battery life by movement type and battery capacity. Get years before replacement for analog, chronograph, and digital movements.
Weight-Driven Clock Drop Time Calculator
Calculate how long a weight-driven clock runs between windings. Enter cord drop length and gear train ratio to get the run time in hours and days.
Clock Rate Error Calculator (Seconds Per Day)
Calculate clock seconds-per-day error from observed gain or loss over a period. Includes pendulum-length adjustment to regulate the rate.
Clock Escapement Beat Rate Calculator
Calculate clock escapement beat rate in BPH from pendulum length or gear train ratios. Returns seconds per beat and pendulum adjustment to correct timing.
Clock Mainspring Size Calculator
Calculate clock mainspring width, thickness, and length for mechanical clock repair. Returns spring strength and replacement specifications for restoration.
Clock Gear Train Ratio Calculator
Calculate clock gear train ratios from wheel and pinion tooth counts. Returns total ratio needed for 60-minute and 12-hour hand cycles in mechanical movements.
Pendulum Clock Length Calculator
Calculate pendulum length from beat period using L = g × (T/2π)². Returns length in inches and cm for grandfather, mantel, and cuckoo clock adjustments.