Free Automotive Calculators

20 free tools for vehicle owners — tire sizing, fuel cost, EV range, maintenance schedules, towing capacity and more. Instant results, no signup required.

Tire Tools

All tire tools→

Tire Size Calculator

Compare two tire sizes — diameter, width, speedometer error

Tire Pressure Calculator

Correct PSI adjusted for temperature and load level

Speedometer Correction

Actual speed vs displayed after a tire size change

Fuel & Gas

All fuel & gas→

Calculate miles per gallon and cost per mile

Fuel Cost Calculator

Estimate fuel cost for any trip distance

Road Trip Gas Cost

Trip fuel cost split between passengers

EV Tools

All ev tools→

EV Charging Cost Calculator

Home vs DC fast charging cost and time

EV Range Calculator

Real-world range adjusted for weather and driving style

Maintenance

All maintenance→

Oil Change Calculator

Oil capacity, interval, and DIY cost by vehicle

Brake Pad Life Calculator

Estimate brake pad lifespan from driving style

Battery Life Calculator

Estimate battery lifespan by climate and usage

Coolant Mix Calculator

Antifreeze ratio and freeze/boil protection levels

Wiper Blade Size Finder

Correct wiper blade size for your vehicle

Car Wash Cost Calculator

Home vs automatic vs subscription per year

Auto Paint Cost Calculator

Body work and repaint cost by vehicle size

Engine & Performance

Gear Ratio Calculator

Axle ratio, RPM at speed, and tire size effects

Engine Displacement Calculator

Bore, stroke, cylinders to cubic inches, liters, and cc

Engine Horsepower Calculator

Estimate HP from quarter mile time or dyno numbers

Towing Capacity Calculator

Payload, max trailer weight, and tongue weight check

Trailer Tongue Weight

10-15% tongue weight rule with hitch class check

Latest Guides

EV Charging Cost: Home vs Public, Level 1/2/3 Compared

A full cost breakdown of EV charging — home rates, public network prices, Level 1 vs Level 2 vs DC fast charging. Includes cost-per-mile comparison with gas vehicles.

12 min read

What Affects EV Range? 8 Factors That Drain Your Battery

Cold weather, speed, HVAC, terrain, and more — learn the 8 biggest factors that affect EV range and how much each one costs you in miles. Includes real-world data.

12 min read

15 Ways to Improve Gas Mileage (Ranked by Impact)

Practical tips to improve your car's fuel economy by 10-25%. Ranked from biggest to smallest impact, with estimated MPG savings and cost for each.

12 min read

Instant Results

All calculations run in your browser. No waiting, no server calls, no signup required.

Metric & Imperial

Works with miles, kilometers, gallons, liters. Results converted automatically.

No YMYL Content

Pure technical calculators. No financial advice, no insurance quotes — just the numbers you need.