Car tools & calculators
Free calculators with a plain-English guide beside every one: tires, tint, fuel, ownership costs, maintenance, EVs and unit conversion.
Browse by category
Pick a topic to see every tool in it.
Latest tools
The newest calculators, added as soon as they are published.
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Speed and Distance Converter: mph, km/h, Miles and Kilometres
Convert mph, km/h, m/s and knots, plus miles, kilometres, metres and feet.
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EV Charging Cost Calculator: Cost per Charge and per Mile
Estimate what a charge costs, how much range it adds and the cost per mile.
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Oil Change Interval Calculator: When Is Your Next Oil Change Due?
Find out when your next oil change is due by mileage and by date.
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Car Loan EMI Calculator: Monthly Payment and Total Interest
Work out your monthly car loan payment, total interest and total repaid.
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MPG Calculator: Miles Per Gallon and Cost Per Mile
Turn miles and gallons into MPG, L/100 km, fuel cost and cost per mile.
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Window Tint VLT Calculator: Film + Glass Percentage
Find the real combined VLT of tint film on your glass and compare it with your local limit.
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Tire Size Calculator: Compare Diameter and Speedometer Error
Compare two tire sizes and see the diameter change, real speed and revolutions per mile.
How our tools work
Every tool on this page is paired with a guide that explains the formula it uses, the typical mistakes and when to check your owner manual or a professional instead. Results are planning estimates, not professional or financial advice.