Car Depreciation Calculator

Use a transparent straight-line model to see how much value your vehicle keeps after a chosen number of years and a constant annual decline.

Inputs

Results refresh automatically or when you tap calculate; reset returns the defaults above.

How to use this calculator

Input the price you paid (or the current book value), choose how many years you want to project, and set an annual depreciation rate that reflects the make/model and condition of the vehicle. Every input is required; the calculator prevents invalid characters and uses a deterministic rounding strategy so results stay predictable.

Methodology

The model assumes a constant annual percentage decline and computes the remaining value as Initial Value × (1 - Depreciation Rate / 100) ^ Years. This mirrors the straight-line decay schedules reported by industry sources such as CareEdge and the broader automotive press.

Glossary

Practical example

A car purchased for $20,000 that declines at 15% annually will be worth approximately $8,874.11 after 5 years using this formula: 20,000 × (1 - 0.15)^5 ≈ 8,874.11. The calculator rounds every money value to two decimal places for consistency.

Frequently asked questions

What is car depreciation?
It is the reduction in value caused by age, mileage, wear, and market demand.
Why should I care about depreciation?
Depreciation informs buy/sell timing, insurance decisions, and total cost of ownership.
How do I pick a rate?
Start with manufacturer guides, resale history, or third-party tools; adjust for unique factors.
Can depreciation accelerate?
Yes—if the car ages faster, the rate increases. This calculator models constant rates only.
Does this apply to every car?
It provides general estimates. Collect vehicle-specific data for precise planning.

Full original guide (expanded)

The original legacy page also listed related automotive tools to help you compare expenses. These tools stay available for deeper research:

Formulas

Primary formula:

Final Value = Initial Value × (1 - Depreciation Rate/100)Years

Rounded to the nearest cent using a deterministic two-decimal strategy to avoid floating-point drift.

Citations

Home — calcdomain.com · Accessed 2026-01-19 · https://calcdomain.com/

Lifestyle & Everyday — calcdomain.com · Accessed 2026-01-19 · https://calcdomain.com/lifestyle-everyday

Automotive — calcdomain.com · Accessed 2026-01-19 · https://calcdomain.com/subcategories/automotive

CareEdge — caredge.com · Accessed 2026-01-19 · https://caredge.com/depreciation

Gas Mileage (MPG) Calculator — calcdomain.com · Accessed 2026-01-19 · https://calcdomain.com/mpg

Fuel Cost Calculator | Everyday Life — calcdomain.com · Accessed 2026-01-19 · https://calcdomain.com/fuel-cost

Tire Size Calculator — calcdomain.com · Accessed 2026-01-19 · https://calcdomain.com/tire-size

Oil Change Interval Calculator — calcdomain.com · Accessed 2026-01-19 · https://calcdomain.com/oil-change

Changelog
  • 0.1.0-draft · 2026-01-19 — Initial audit spec draft generated from the legacy HTML extraction.
  • Validate formulas match the implemented straight-line decline and convert narrative content into the canonical layout.
  • Confirm sources remain unchanged from the original asset while ensuring the data references are current.
✓ Verified by Ugo Candido Last Updated: 2026-01-19 Version 0.1.0-draft
Version 1.5.0
+ rounded.toFixed(2); } }; const debounce = (fn, delay = 100) => { let timer; return (...args) => { clearTimeout(timer); timer = setTimeout(() => fn(...args), delay); }; }; function parseInputs() { return { initialValue: parseFloat(elements.initialValue?.value ?? ''), years: parseFloat(elements.years?.value ?? ''), depreciationRate: parseFloat(elements.depreciationRate?.value ?? '') }; } function validate(inputs) { const errors = []; if (!Number.isFinite(inputs.initialValue) || inputs.initialValue <= 0) { errors.push('Initial car value must be a number greater than 0.'); } if (!Number.isFinite(inputs.years) || inputs.years <= 0) { errors.push('Years of ownership must be a positive number.'); } if (!Number.isFinite(inputs.depreciationRate) || inputs.depreciationRate < 0 || inputs.depreciationRate > 100) { errors.push('Depreciation rate must be between 0 and 100%.'); } return { ok: errors.length === 0, errors }; } function compute(inputs) { const rateDecimal = inputs.depreciationRate / 100; const decayBase = 1 - rateDecimal; const finalValue = inputs.initialValue * Math.pow(decayBase, inputs.years); const totalDepreciation = inputs.initialValue - finalValue; if (!Number.isFinite(finalValue)) { return null; } return { finalValue: finalValue, depreciationAmount: totalDepreciation, years: inputs.years, rate: inputs.depreciationRate }; } function format(outputs, inputs) { return { finalValue: fmtCurrency(outputs.finalValue), depreciation: fmtCurrency(outputs.depreciationAmount), years: Number.isFinite(inputs.years) ? round2(inputs.years).toString() : '0', rate: Number.isFinite(inputs.depreciationRate) ? round2(inputs.depreciationRate) + '%' : '0%' }; } function render(formatted, validation, outputs) { if (!elements.errorBox) return; if (!validation.ok) { elements.errorBox.textContent = validation.errors.join(' '); elements.errorBox.style.display = 'block'; elements.finalValue.textContent = '$0.00'; elements.depreciation.textContent = '$0.00'; elements.yearsDisplay.textContent = '0'; elements.rateDisplay.textContent = '0%'; elements.finalSubtitle.textContent = 'Enter valid inputs to see the depreciated value.'; return; } elements.errorBox.style.display = 'none'; elements.finalValue.textContent = formatted.finalValue; elements.depreciation.textContent = formatted.depreciation; elements.yearsDisplay.textContent = formatted.years; elements.rateDisplay.textContent = formatted.rate; const yearsText = outputs && Number.isFinite(outputs.years) ? `${round2(outputs.years)} year${round2(outputs.years) === 1 ? '' : 's'}` : 'selected years'; elements.finalSubtitle.textContent = `Remaining value after ${yearsText} at ${formatted.rate}.`; } function update() { const inputs = parseInputs(); const validation = validate(inputs); if (!validation.ok) { render(null, validation); return null; } const outputs = compute(inputs); if (!outputs) { render(null, { ok: false, errors: ['Unable to compute values with the current inputs.'] }); return null; } const formatted = format(outputs, inputs); render(formatted, validation, outputs); return outputs; } [elements.initialValue, elements.years, elements.depreciationRate].forEach((el) => { if (!el) return; el.addEventListener('input', debouncedUpdate); }); calcBtn?.addEventListener('click', () => update()); resetBtn?.addEventListener('click', () => { elements.initialValue.value = defaults.initialValue; elements.years.value = defaults.years; elements.depreciationRate.value = defaults.depreciationRate; const debouncedUpdate = debounce(update, 100); document.querySelectorAll('#inputsCard input, #inputsCard select, #inputsCard textarea') .forEach((el) => { el.addEventListener('input', debouncedUpdate); el.addEventListener('change', debouncedUpdate); }); update(); }); update(); })();