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Appliance replacement payback calculator

Estimate replacement payback under three energy-price assumptions.

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All prefilled business examples are fictional. Replace them with your own checked inputs.

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Your result

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How this tool works

Annual saved kWh = (old W − new W) × hours/day × days/year ÷ 1,000. Payback years = extra purchase cost ÷ annual saving. Price scenarios use 75%, 100% and 125% of your price.

Method version: 2026-09-19.2

Input format

No automatic currency conversion. CSV headers remain English; use decimal points and ISO dates (YYYY-MM-DD).

Current average power (W): oldwatts
Replacement average power (W): newwatts
Operating hours per day: hours
Operating days per year: days
Extra purchase cost (your currency): price
Electricity cost per kWh (same currency): rate
Comparison period (years): life

Reproducible example

All prefilled business examples are fictional. Replace them with your own checked inputs.

Scroll horizontally to see all columns.

Energy-price scenario	Price / kWh	Annual energy saved (kWh)	Annual saving	Payback years	Net after comparison period
Lower price	0.2250	132.00	29.70	6.1	57.60
Your price	0.3000	132.00	39.60	4.5	136.80
Higher price	0.3750	132.00	49.50	3.6	216.00

Limits and assumptions

Power is an average draw, not necessarily the label maximum. Operating hours and appliance lifetime are user assumptions. No inflation, financing or maintenance difference is included.

Negative savings mean the new appliance consumes more under these inputs.

Sources and specifications

RFC 4180 — CSV format

Read the text version · Download example inputs