Automotive Calculators
Free tire, fuel, and vehicle tools
Whether you are comparing tire sizes, calculating fuel costs for a road trip, or figuring out your monthly car payment, our automotive calculators give you instant, accurate answers. All tools are free and work on any device.
Gas Mileage Calculator
Calculate your fuel economy in MPG or L/100km.
Car Lease vs Buy Calculator
Compare the total cost of leasing versus buying a vehicle.
Tire Size Calculator
Compare tire dimensions and check compatibility.
Car Payment Calculator
Estimate monthly payments for your auto loan.
Oil Change Interval Calculator
Find the recommended oil change interval for your vehicle.
Tire Diameter Calculator
Calculate overall tire diameter, circumference, and revs per mile.
Speedometer Correction Calculator
Calculate actual speed after changing tire sizes.
Fuel Cost Calculator
Estimate total fuel cost for a trip based on distance and MPG.
Horsepower Calculator
Calculate horsepower from torque and RPM.
0-60 MPH Calculator
Estimate 0-60 mph time from horsepower and vehicle weight.
Towing Capacity Calculator
Calculate max towing capacity from GCWR and vehicle weight.
Gear Ratio Calculator
Calculate axle gear ratio, overall ratio, and speed at RPM.
Brake Horsepower Calculator
Convert wheel HP to brake HP or calculate from torque and RPM.
Automotive Guides & Articles
How to Read Tire Size Numbers: Complete Guide
Learn to decode the numbers on your tire sidewall, including width, aspect ratio, and diameter.
Tire Size Comparison: What Changes When You Go Bigger?
Understand the effects of upsizing your tires on speedometer accuracy, fuel economy, handling, and ride comfort.
How Tire Size Affects Speedometer Accuracy
Learn how changing your tire size impacts your speedometer reading and what you can do about it.
Best Tire Upgrades for Fuel Efficiency
Discover how your tire choice impacts fuel economy and which upgrades can save you money at the pump.
Related Categories
Frequently Asked Questions
How do I compare tire sizes?
Use our Tire Size Calculator to compare any two tire sizes side by side. It shows differences in diameter, width, circumference, and speedometer impact.
Will bigger tires affect my speedometer?
Yes, larger tires cause your speedometer to read lower than actual speed. Use our Speedometer Correction Calculator to find the exact error.
How do I calculate fuel cost for a road trip?
Enter the trip distance, your vehicle MPG, and current gas price into our Fuel Cost Calculator for an instant estimate.
How is MPG calculated?
MPG = Miles Driven ÷ Gallons Used. Fill your tank, drive normally, then fill again and note the gallons. Divide your trip miles by gallons used.
Are these automotive calculators free?
Yes, all calculators are completely free with instant results. No registration or sign-up needed.