Car Maintenance Cost Calculator
Choose a currency and use the matching distance, fuel-efficiency, and fuel-price units to build a realistic monthly car running-cost budget.
Educational estimate. Calculator results are for planning and information only, not financial, tax, medical, legal, or engineering advice. Verify important decisions with official sources or a qualified professional.
Car Maintenance Cost Calculator
Monthly Ownership Cost
📐 Formula & Method
Monthly Running Cost
Fuel use is calculated from the selected unit system: mpg, km/L, or L/100km.
Annual Running Cost
Loan payments, registration, parking, tolls, taxes, and depreciation are excluded.
📋 How to Use
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1
Enter the required values.
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2
Check the units and selected option.
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3
Click Calculate to see the result and useful breakdown.
💡 Key Insights
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A reserve smooths irregular servicing and repair bills into a monthly budget.
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For mpg (UK) with fuel priced per litre, imperial gallons are converted using 4.54609 litres per gallon.
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This calculator excludes finance payments, registration, parking, tolls, and depreciation.
🧮 Worked Examples
US monthly running cost
1,000 mi/month at 25 mpg (US), fuel at $3.50/gal, plus $140 insurance, $75 service, and $60 repairs.
Car Maintenance Cost Calculator Guide
This calculator is designed for fast everyday estimates while keeping the formula visible and easy to verify.
Results are calculated in your browser and are intended for planning, learning, and comparison. For regulated financial, tax, medical, legal, or construction decisions, confirm details with a qualified professional.
🔬 Methodology & Accuracy
Formula: Uses the formula shown on the page with client-side JavaScript calculations.
Data sources: Standard arithmetic, engineering, finance, or health estimation formulas as noted in the methodology.
Last reviewed: June 2026 · General formula used: Monthly Running Cost · Accuracy: Results are precise to two decimal places using IEEE-754 double-precision arithmetic. Intended for educational and planning use only.
For informational purposes only. Results are estimates based on the inputs and formulas provided. For financial, tax, medical, or legal decisions, consult a qualified professional. Rates and regulations change — always verify current figures with official sources.