Horology Tools

Browse all available horology tools.

Available tools

Alarm Set Offset Forward minutes from current clock time to an alarm time, wrapping at 24 hours.
Amplitude Decline Power Reserve Observed linear balance-amplitude decline in degrees per hour over a running interval.
Amplitude Lift Ratio Ratio of a movement's actual lift angle to the lift angle assumed in an amplitude calculation.
Asthmometer Breath Rate Breaths per minute from a counted number of breaths and elapsed seconds.
Atm To Meters Freshwater hydrostatic depth equivalent of a gauge-pressure rating in standard atmospheres; not a safe diving depth.
Beat Error Milliseconds Timegrapher beat error as half the absolute difference between alternating long and short beat intervals.
Beats Per Day Total watch beats in a 24-hour day from beats per hour.
Bph To Hertz Balance oscillation cycles per second from beats per hour, with two beats per full oscillation.
Bracelet Link Adjustment Minimum whole removable bracelet links to reduce length by at least a target amount.
Carrousel Rotation Carrousel rotations per hour from its cage rotation period in seconds.
Case Luglug Ratio Watch lug-to-lug span divided by wearer wrist width, using matching length units.
Caseback Turns Close Caseback turns required for a threaded axial travel distance at specified thread pitch.
Center To Escape Ratio Rotational speed ratio across two gear stages from driving and driven tooth counts.
Chrono Elapsed From Steps Elapsed stopwatch time in seconds from beat-counted steps at a known beats-per-hour rate.
Crown Turns Full Wind Crown turns to fully wind a mainspring from usable barrel turns and crown turns per barrel turn.
Daily Rate To Annual Drift Signed clock drift over a supplied year length in days from seconds gained or lost per day.
Daily Rate To Monthly Drift Signed clock drift over a specified number of calendar days from seconds gained or lost per day.
Daily Rate To Weekly Drift Signed accumulated clock drift over a seven-day week from seconds gained or lost per day.
Day Disc Advance Rate Day-disc angular advance in degrees per daily step for a specified number of disc positions.
Daylight Saving Shift Adjusted 24-hour clock hour after a user-supplied signed daylight-saving shift; does not infer dates or jurisdictions.
Deadbeat Tick Rate Deadbeat seconds-hand jumps per second from supplied jumps per minute.
Decimal Minutes Scale Hundredths of a minute from an elapsed number of conventional seconds.
Depth Static Pressure Water gauge pressure in pascals from depth, fluid density and gravitational acceleration.
Dual Time Difference Shortest signed hour difference from a first 24-hour clock reading to a second reading, in [-12,12).
Dynamic Pressure Factor Dynamic pressure ½ρv² in pascals for incompressible flow at specified density and speed.
Flip Disc Rate Flip-disc advances per minute from total disc positions and one complete cycle duration.
Foudroyante Steps Foudroyante indication steps completed over elapsed seconds at a specified step frequency.
Fourth Wheel Rpm Fourth-wheel rotations per minute from seconds per revolution.
Gasket Compression Percent Gasket compression percentage from uncompressed thickness and installed compressed thickness.
Gear Train Ratio Driven rotational speed divided by driving rotational speed for one meshing gear pair.
Glide Motion Step Rate Continuous-motion hand-control step rate in steps per second from supplied steps per hour.
Gmt Hand Offset GMT hand angle relative to the 12 o'clock position on a 24-hour dial from UTC hour and minute.
Hand Wind Turns Per Day Average crown turns per day needed to replace a full wind distributed over its power reserve.
Hertz To Bph Watch beats per hour from full balance oscillations per second, with two beats per cycle.
Jumping Hour Advance Rate Average jumping-hour advances per day for a specified hours-per-jump interval.
Mainspring Turns Power Reserve Ideal running hours from usable barrel turns and measured running hours per barrel turn.
Meters To Atm Gauge pressure in standard atmospheres from freshwater depth, density and gravity; not a watch depth rating.
Moonphase Correction Days Years until an absolute one-day lunar-phase display error from a nonzero drift measured in lunar days per year.
Moonphase Drift Per Year Signed lunar-phase error in equivalent lunar days per Julian year from the displayed and true synodic cycle lengths.
Moonphase Gear Ratio Display-cycle days from moon-disc tooth count and tooth advances per day.
Motion Works Ratio Rotational speed ratio across two motion-works gear stages from tooth counts.
Pendulum Length From Period Effective small-angle pendulum length for a target complete oscillation period.
Pendulum Period Small-angle ideal pendulum period in seconds from effective length and local gravitational acceleration.
Period From Frequency Full oscillation period in seconds from positive cycle frequency in hertz.
Power Reserve Depletion Remaining power-reserve hours after elapsed running hours, with no winding during the interval.
Pulsometer Heart Rate Heartbeats per minute from a counted number of beats and elapsed seconds.
Quartz Battery Life Ideal quartz-watch battery life in hours from usable mAh capacity and average mA draw.
Quartz Frequency Drift Signed quartz oscillator frequency error in parts per million relative to nominal frequency.
Quartz Ppm To Month Seconds Signed accumulated timing error in seconds over a month with a supplied number of days.
Regatta Countdown Steps Number of complete countdown steps in a remaining duration at a specified step size.
Regulator Index Rate Change Predicted signed daily-rate change from index movement and measured sensitivity in seconds per day per index unit.
Repeater Quarter Strikes Completed quarter-hour indications on a minute repeater from the current minute 0–59.
Residual Amplitude Remaining balance amplitude after subtracting a measured angular decline from the starting amplitude.
Retrograde Return Time Average angular return speed in degrees per second from sweep angle and return duration.
Retrograde Span Degrees Positive angular sweep of a retrograde indicator from start angle to end angle.
Rotor Wind Rate Effective barrel turns per hour from rotor revolutions per hour and rotor revolutions required per barrel turn.
Seconds Gained Per Day Signed seconds gained per day from a frequency error in parts per million.
Seconds Pendulum Length Small-angle pendulum length for a two-second full period (one-second half swing) at local gravity.
Sidereal To Solar Mean-solar hours corresponding to a duration measured in sidereal hours, using a sidereal day of 86164.0905 SI seconds.
Solar To Sidereal Sidereal hours corresponding to a duration measured in mean-solar hours, using a sidereal day of 86164.0905 SI seconds.
Strike Train Energy Mechanical energy spent on strikes from count and energy used per strike.
Sweep Steps Per Second Watch seconds-hand movement steps per second when each balance beat advances the hand once.
Synodic Cycle Display Moon-phase display cycle in days from gear tooth count and advances per calendar day.
Tachymeter Base Calibration Tachymeter dial reading in units per hour for one event completed in the supplied elapsed seconds.
Tachymeter Speed Average speed in km/h from distance in kilometres and elapsed seconds.
Telemeter Distance Sound travel distance in kilometres from time between a visible event and its audible arrival.
Thermocompensation Shift First-order oscillator frequency shift in ppm from a specified ppm-per-degree coefficient and temperature change.
Third Wheel Speed Driven wheel revolutions per minute from driving wheel speed and mating tooth counts.
Timing Rate Extrapolation Extrapolated seconds gained or lost per 24 hours from a measured signed error over an observation interval.
Tourbillon Revolutions Per Day Tourbillon cage revolutions per 24-hour day from its rotation period in seconds.
Tourbillon Rotations Per Hour Tourbillon cage rotations per hour from its rotation period in seconds.
Train Wheel Teeth Sum Total teeth across three train wheels; bookkeeping for a gear-train design.
Week Disc Advance Week-disc angular advance in degrees per weekly step for a specified number of positions.
World Time Zone Offset Local 24-hour clock hour from UTC hour and a signed, possibly fractional, offset in hours; does not determine DST.
Wrist Coverage Percent Lug-to-lug watch span as a percentage of wearer wrist width.

Don't forget to set a bookmark for tool.io!
Privacy | Imprint | Cookies