Odometer guide: odometers and trip meters

Written by Muneeb Rana · Last updated 26 October 2026

Quick answer: This odometer guide explains how mechanical and digital odometers count distance, how GPS odometers sum your movement, the difference between odometers and trip meters, keeping mileage records for taxes and spotting odometer fraud. It links every odometer article and the Speedometer PRO odometer and trip features.

TL;DR

• Odometer basics.
• GPS distance.
• Trip meters.
• Tax logs.
• Fraud.

Odometer guide: articles

• Odometer app: total distance from GPS: Speedometer PRO works as an odometer app: it adds up the distance your phone measures by GPS across trips. How it counts and where it differs from your car.
• Trip meter: duration, distance, average and max speed: The Speedometer PRO trip meter shows duration, distance, average and max speed on the Current Trip card. Start, stop and read your trip stats.
• Trip tracker: your past trips in one list: Use Speedometer PRO as a trip tracker: finished trips are saved to history so you can review distance, duration and speed for past journeys.
• Odometer vs trip meter: Odometer vs trip meter: one records lifetime distance, the other resets per trip. How each works in cars and in a GPS app, and when to use which.
• How odometers work: How odometers work: mechanical gear trains, electronic wheel-speed sensors and GPS distance in apps, plus why each one drifts and how to check it.
• How to measure distance driven: How to measure distance driven: your car's trip meter, a GPS odometer app, or a map route, with accuracy notes and tips for logging business trips.
• Mileage tracking for taxes: Mileage tracking for taxes: what the IRS expects in a mileage log, standard rate vs actual costs, and how a GPS trip meter can help you keep records.
• Odometer fraud: how to spot it: Odometer fraud explained: how rollbacks work, red flags when buying a used car, history reports, and what US law and NHTSA say. Protect yourself.

Related features

• Odometer app: total distance from GPS: Speedometer PRO works as an odometer app: it adds up the distance your phone measures by GPS across trips. How it counts and where it differs from your car.
• Trip meter: duration, distance, average and max speed: The Speedometer PRO trip meter shows duration, distance, average and max speed on the Current Trip card. Start, stop and read your trip stats.
• Trip tracker: your past trips in one list: Use Speedometer PRO as a trip tracker: finished trips are saved to history so you can review distance, duration and speed for past journeys.

Choosing a tool

Use the vehicle's odometer for legal records and a GPS trip log for journeys.

Odometer and the law

Tampering with a vehicle odometer is illegal in many countries, including under US federal law. Always record official mileage from the vehicle itself.

Note

Your vehicle's odometer is the legal record; a GPS odometer is a personal estimate.

Get Speedometer PRO on Google Play · Download on the App Store · Set it up before you move; never handle your phone while driving.

Sources

• Odometer (Wikipedia): en.wikipedia.org (accessed 26 October 2026)
• Trip computer (Wikipedia): en.wikipedia.org (accessed 26 October 2026)
• Standard mileage rates (IRS): irs.gov (accessed 26 October 2026)