Maintenance & Fluid Tools
Free car maintenance and fluid calculators for common service tasks. Plan oil changes, service intervals, coolant mix, brake pad life, battery sizing, fluid quantities, and estimated maintenance costs for your vehicle.
Car Service Cost Estimator – Budget Your Maintenance
Car Service Cost Estimator Select the services you need and get an instant estimated price range — plan your maintenance budget before visiting a shop.....
Coolant Mix Calculator – Antifreeze Ratio Tool
Coolant Mix Calculator Get the exact antifreeze-to-water ratio for your target freeze protection — works for any cooling system capacity. Coolant Mix Calculator System capacity....
Coolant Mix Calculator — Antifreeze Ratio
Coolant Concentration Mixer Calculate the exact antifreeze-to-water ratio needed to protect your cooling system at any target freeze point. The wrong mix freezes the block....
Oil Change Calculator – Next Service Mileage
Oil Change Calculator Calculate your next oil change mileage based on oil type and driving conditions — stay ahead of your service schedule. Oil Change....
Oil Change Verifier — Drained vs Refilled Check
Oil Change Verifier Verify that the oil change shop drained and refilled the correct amount of oil. Comparing drained volume to spec is the simplest....
Oil Viscosity Explained – Decode 5W-30 & More
Oil Viscosity Guide Decode any engine oil grade like 5W-30 — understand the winter and operating viscosity ratings and what they mean for your car.....
Service Cost Estimator — Parts & Labor by Job
Service Cost Estimator Estimate parts and labor cost for the 20 most common car repairs. Compare to your shop’s quote before saying yes, or budget....
Spark Plug Gap Helper — Convert & Match Spec
Spark Plug Gap Helper Convert spark plug gap between inches, millimeters, and thousandths of an inch, and verify it matches your engine’s factory spec. Wrong....
Tire Pressure Calculator — Cold PSI by Temperature
Tire Pressure Adjustment Calculator Calculate the correct cold tire pressure for current temperature, load, and altitude. Pressure drops about 1 PSI per 10°F drop in....
Tire Size Comparison — Diameter & Speedo Error
Tire Size Comparison Compare two tire sizes side-by-side for overall diameter, sidewall height, contact patch width, and speedometer error percentage. Essential when upgrading wheels, plus-sizing,....
