Watch Beat Rate Converter — VPH to Hz & s/d Calculator

Convert vibrations per hour (VPH) to Hertz, ticks per second, and calculate the daily rate impact of a single lost tick. Works with ETA, Sellita, Miyota, Seiko, Rolex, Omega, and Zenith calibers.

Movement
4.000 Hz Frequency
8 /s Ticks per second
If it loses 1 tick per hour
3 s/d

One missed tick per hour means ~3 seconds lost per day at 28,800 vph. Lower beat rates amplify the impact.

1
Select your movement or enter a custom VPH.
2
Read the Hz frequency, ticks per second, and the impact of a lost tick.
Higher beat rates (36,000 vph) give smoother hand sweep and better precision, but also more wear on the escapement.
Utilities Studio

Want this utility on your website?

Customize colors and dark mode for WordPress, Notion or your own site.

Go Ahead

Frequently Asked Questions

How do you convert VPH to Hz?

Divide the VPH by 7,200. A watch beating at 28,800 vph runs at 4 Hz (28,800 ÷ 7,200 = 4). The division by 7,200 accounts for the fact that one complete oscillation contains two vibrations, and there are 3,600 seconds in an hour.

What does a higher beat rate mean for accuracy?

Higher beat rates generally allow for greater theoretical precision because the balance wheel is less affected by positional disturbances. However, they also create more friction and wear on the pallet stones and escape wheel, requiring better lubrication and more frequent servicing.

How does a lost tick affect daily accuracy?

One missed tick per hour translates to 24 lost ticks per day. The time lost depends on your beat rate: divide 86,400 by your VPH. At 28,800 vph, that's 3 seconds per day. At 18,000 vph, it's 4.8 seconds per day.

Can a watch recover from a lost tick?

No. Once a tick is missed, the time is permanently lost. The watch doesn't "catch up." This is why escapement health — clean pallet stones, proper lubrication, and correct beat error — directly impacts daily rate.

# Watch Beat Rate Converter — VPH to Hz & Seconds per Day

Every mechanical watch beats at a specific rate — the number of vibrations its balance wheel makes per hour. That number determines how smooth the seconds hand sweeps and how precise the watch can be. This converter translates VPH to Hz and ticks per second, and shows you the real-world impact of a single lost tick.

# What Is a Beat Rate?

The beat rate, measured in vibrations per hour (vph), is the frequency at which a watch's balance wheel oscillates. A common rate is 28,800 vph — that's 4 Hz, or 8 ticks per second. Higher beat rates like 36,000 vph (5 Hz) produce a smoother sweeping motion and can theoretically improve accuracy by reducing the effect of positional errors.

# Why a Lost Tick Matters

If a watch's escapement fails to deliver one tick due to friction, magnetism, or wear, that lost tick translates directly into lost time. At 28,800 vph, a single missed tick per hour adds up to about 3 seconds per day. At 18,000 vph, the same error costs nearly 5 seconds per day. This tool helps you understand the math behind regulation.

# Common Beat Rates

Vintage pocket watches and early automatics often run at 18,000 vph (2.5 Hz). Many Seiko and Miyota calibers use 21,600 vph (3 Hz). The modern standard is 28,800 vph (4 Hz), used by ETA, Sellita, Rolex, and others. High-beat movements like the Zenith El Primero run at 36,000 vph (5 Hz) for greater precision.

Bibliographic References

More utilities from Horology Tools & Reference Guides

Watch Accuracy Tracker & Logger

Log and calculate the daily rate deviation of your mechanical or quartz watches to analyze precision and consistency.

Use Tool

Watch Wrist Presence & Sizing Calculator

Calculate the case-to-wrist ratio, flat wrist width coverage, and determine the ideal watch size for your wrist based on aesthetic guidelines.

Use Tool

Watch Demagnetizing Timer & Guide

A precise countdown timer with audio cues for DIY watch demagnetization. Get the exact press duration needed for your demagnetizing coil.

Use Tool

Watch Savings Goal Planner

Set and track savings goals for your next watch purchase. Visualize progress, calculate timelines, and stay motivated.

Use Tool

Watch Crown Reference Guide

Interactive guide to watch crown positions, winding directions, and setting functions for popular movements.

Use Tool

Watch Power Reserve Estimator

Estimate how much power reserve your watch has left based on crown turns and hours worn. Works with popular ETA, Sellita, Miyota, Seiko, and Rolex calibers.

Use Tool

Watch Water Resistance Converter — Meters, ATM, Bar & Feet

Convert watch water resistance ratings between meters, feet, ATM, and bar. See what each rating actually means for daily wear, swimming, and diving.

Use Tool

Watch Strap Taper & Proportions Calculator

Calculate the ideal strap taper for your watch based on case diameter and lug width. Find the perfect buckle width for a balanced look.

Use Tool