Quick guide
How to use this calculator
- Enter values from one real situation and keep currencies, quantities, and periods consistent.
- Use the optional fields only when they apply; the calculator will keep every entered adjustment visible in the result.
- Compare the component outputs and read the calculator-specific boundary before making a purchase or plan.
Calculation method
Calculation method
Straight-line value = cost − age × (cost − residual) ÷ useful life; declining value = cost × (1 − annual rate)^age, bounded by residual.
Entered fixed decimals use exact rational arithmetic wherever the task involves money, ratios, or allocations. Whole packages, tables, seats, and items round only where the real task requires indivisible units.
Worked example
Worked example
A 1,000 appliance with 100 residual over 10 years has straight-line value 550 after five years.
Straight-line value = cost − age × (cost − residual) ÷ useful life; declining value = cost × (1 − annual rate)^age, bounded by residual.
Supported inputs
Precision and limits
Your scenario
No live price, promotion, retailer policy, tax, cultural norm, household consumption rate, attendance rate, or media speed is supplied automatically.
Plan, not a guarantee
Results organize visitor-entered assumptions. They do not guarantee availability, attendance, product life, savings, suitability, or contractual rights.
Precision and privacy
Inputs stay in this browser. Invalid denominators, contradictory counts, impossible percentages, and unsupported ranges return explicit messages rather than misleading results.
Calculator-specific boundary
This is a visitor-selected depreciation scenario, not an appraisal, resale quote, insurance valuation, accounting policy, or tax calculation.
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