Automotive calculators
Lease vs buy, true cost to own, fuel economy, and mix ratios. Every tool shows its formula, updates live, and works on any device.
Saved & recent
- Fuel Economy Comparison CalculatorAnnual and multi-year fuel cost for two vehicles from MPG, miles driven, and pump price — gallons saved, monthly difference, and hybrid payback on one board.→
- Lease vs Buy CalculatorThree-year lease cost against a financed purchase with resale value subtracted — monthly loan payment, total interest, and which path keeps more cash.→
- Oil to Gas Ratio CalculatorTwo-stroke premix amounts for 50:1, 40:1, 32:1, and 100:1 mixes — US fluid ounces and milliliters of oil per gallon or liter of gasoline.→
- True Cost to Own CalculatorFive-year cost of a car: purchase price, fuel from miles and MPG, insurance, and maintenance, minus resale value — with cost per mile and per year.→
How this manual is organized
Each entry above opens a one-page tool: inputs on the left, the live result on its color board, and beneath the card the formula with worked examples and the method's limits. Save the tools you use often — they'll wait on this shelf next visit.