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Appliance Energy Calculator

Compare documented annual electricity use for two appliances using one local rate, entered upgrade cost, and explicit planning horizon.

Use this result well

Inputs that matter
Comparable documented or representative measured annual kWh for the old and new appliances, one local electricity rate, entered upgrade cost, and a chosen planning horizon
Output to expect
Old/new annual electricity cost, signed annual difference, simple energy-cost break-even when savings are positive, and horizon net after entered upgrade cost
How it works
Multiply each annual-kWh figure by the same entered rate, subtract new from old, and compare cumulative entered energy savings with the entered upgrade cost
  • Use like-for-like annual figures; an EnergyGuide value is a standardized estimate and nameplate watts should not be treated as continuous annual demand.
  • Keep water/fuel, rate tiers, maintenance, service life, installation, rebates, financing, disposal and environmental impacts separate unless you explicitly model them elsewhere.

Choose your path

Built around the job you need to finish

Compare two documented or representative measured annual electricity-use figures on the same local rate and planning horizon without treating nameplate watts as continuous consumption.

Household comparing an old and new appliance

Translate like-for-like annual kWh into local electricity cost.

Enter comparable EnergyGuide/DOE or representative measured annual figures and one local rate.

Sees the energy-only annual difference without a universal savings claim.

Buyer testing an upgrade budget

See whether entered electricity savings recover an entered upgrade cost within a chosen horizon.

Add the scoped upgrade cost and planning horizon, then inspect simple break-even and horizon net.

Keeps rebates, installation, service life, financing and maintenance outside the entered result.

Reviewer comparing a higher-use replacement

Preserve an unfavorable or equal branch.

Enter a new appliance with equal or higher annual kWh.

Gets same/higher cost rather than a forced savings story or false break-even.

Authoritative checks for this tool

Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.

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Projects using Appliance Energy Calculator

This tool is part of these guided projects. Each project provides step-by-step instructions with checklists and all the tools you need in one place.

Home Energy Decision Record

Turn exact bills, tariffs, measured or documented equipment use and household constraints into bounded cost scenarios, authorized changes and weather-aware verification.

6 steps2 toolsStart project

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Reference & details

How it works

Comparable annual electricity use

Enter annual kWh for both appliances on the same usage and test basis. Standardized labels support model comparison, while representative measurement can reflect a specific household; neither should be mixed casually with nameplate power.

old/new annual electricity = entered kWh per year

One entered local rate

Each annual-use figure is multiplied by the same electricity-price basis so the signed difference is auditable. Rate tiers and time-of-use effects are not added automatically.

annual electricity cost = annual kWh × entered $/kWh

Simple break-even and horizon

When entered annual energy cost is lower, upgrade cost is divided by that annual difference. The horizon net subtracts only the entered upgrade cost; a zero or negative difference has no energy-savings break-even.

horizon net = annual cost difference × years − entered upgrade cost

Updated: August 2026

Example Scenarios

A shopper compares two similar models' annual kWh on the same local rate and keeps the label's standardized-use scope visible.

A household uses a representative plug-meter or utility record for the old appliance and a comparable documented annual figure for the candidate replacement.

A replacement with equal or higher entered annual kWh reports the same or higher electricity cost and does not fabricate a break-even year.

Common Mistakes to Avoid

Multiplying nameplate watts by 8,760 hours for a cycling appliance

Use a comparable annual-kWh disclosure or representative measurement that reflects duty cycle and operating conditions.

Calling an energy-only break-even a replacement recommendation

Separately evaluate installation, rebates, water/fuel, maintenance, reliability, remaining service life, financing, disposal and non-financial impacts.

FAQ

Use figures with comparable appliance category, capacity, features, test basis and usage scope. EnergyGuide supports similar-model comparison; measurement should cover a representative period.

Use the marginal or effective local rate appropriate to your decision and apply the same basis to both appliances. Model time-of-use or tier effects separately when material.

Nameplate power is not continuous consumption for cycling or variable-load equipment. Actual annual energy depends on duty cycle, settings, environment and use.

Only the entered upgrade cost and entered annual electricity-cost difference. It excludes every other cost or benefit unless you model it separately.

No. The horizon is a user-entered comparison period, not a service-life forecast or guarantee that the old or new appliance remains in operation.

About Appliance Energy Calculator

Compare like-for-like annual kWh figures from EnergyGuide/DOE documentation or representative measurement. The calculator prices both on the same entered local rate and shows a simple energy-only break-even; it does not assume nameplate watts run continuously or predict service life and total ownership cost.