Appliance Lifetime Cost Comparison Calculator
Compare two appliance choices by combining the upfront price, EnergyGuide annual kWh, recurring costs, expected resale value, and the time value of money.
Lower lifetime-cost modelModel B
- Model A first-year operating cost
- $153.50
- Model B first-year operating cost
- $109.50
- Model A lifetime cost
- $2,630.23
- Model B lifetime cost
- $2,455.06
- Lifetime savings
- $175.17
- Model A equivalent annual cost
- $264.24
- Model B equivalent annual cost
- $246.64
- Discounted break-even year
- Year 8
- Maximum justified price premium
- $475.17
Cumulative discounted cost by year
| Year | Model A | Model B | Model B minus Model A |
|---|---|---|---|
| 1 | $1,149.03 | $1,406.31 | $257.28 |
| 2 | $1,295.48 | $1,510.65 | $215.17 |
| 3 | $1,439.41 | $1,613.05 | $173.64 |
| 4 | $1,580.88 | $1,713.58 | $132.70 |
| 5 | $1,719.94 | $1,812.27 | $92.33 |
| 6 | $1,856.64 | $1,909.16 | $52.52 |
| 7 | $1,991.04 | $2,004.29 | $13.25 |
| 8 | $2,123.19 | $2,097.72 | -$25.47 |
| 9 | $2,253.14 | $2,189.47 | -$63.67 |
| 10 | $2,380.93 | $2,279.58 | -$101.34 |
| 11 | $2,506.61 | $2,368.10 | -$138.51 |
| 12 | $2,630.23 | $2,455.06 | -$175.17 |
The justified premium applies to Model B, the model with the lower present-value operating cost.
Other annual costs stay flat; only electricity costs use the energy-price escalation rate.
How to use this calculator
- Enter how many years you expect to keep either appliance.
- Replace any label electricity price with the all-in rate from your utility bill.
- Enter each model price, installation cost, rebate, annual kWh, other yearly costs, and end value.
- Read the lifetime cost, equivalent annual cost, payback year, and maximum justified price premium.
How the lifetime cost is calculated
This calculator compares two appliances on a present-value lifecycle cost basis. That means future electricity costs, recurring costs, and end value are converted into today's dollars before the two choices are compared.
For each model, net upfront cost is:
U = purchase price + delivery and installation - rebate
The electricity cost in year t is:
E_t = annual kWh × current $/kWh × (1 + energy escalation)^(t - 1)
The present-value lifecycle cost is:
LCC = U + sum((E_t + other annual cost) ÷ (1 + discount rate)^t) - end value ÷ (1 + discount rate)^years
The equivalent annual cost converts that lifecycle cost into a level yearly amount. When the discount rate is zero, it is simply lifecycle cost divided by years. Otherwise it uses the capital-recovery factor:
EAC = LCC × d ÷ (1 - (1 + d)^(-years))
What moves the result most
The result is usually driven by the price premium, the annual kWh difference, and the ownership period. A more efficient model needs enough discounted operating savings to recover its higher upfront cost. A longer ownership period gives those savings more time to accumulate; a higher discount rate makes future savings worth less today.
The break-even year uses cumulative discounted cost. The calculator checks each whole year and reports the first year when the initially more expensive model becomes no more costly than the alternative. If the lower-upfront model also has the lower lifetime cost, the result is an immediate advantage rather than a future payback date.
What this calculator leaves out
EnergyGuide kWh is useful because it is standardized, but it is still an estimate. Actual use can change with household habits, temperature settings, climate, load size, occupancy, and appliance condition. The tool also assumes both appliances last for the full ownership period.
Other annual costs stay flat in nominal dollars; only electricity uses the entered escalation rate. Taxes, financing charges, extended warranties, unexpected repairs, performance differences, and capacity differences are excluded unless you include them in the entered costs.
Worked example
Suppose Model A costs $900 plus $100 to install and uses 550 kWh per year. Model B costs $1,200 plus $100 to install and uses 350 kWh per year. With electricity at $0.17/kWh, 2% annual energy escalation, a 3% discount rate, and a 12-year ownership period, Model A has a first-year operating cost of $153.50 and Model B has a first-year operating cost of $109.50.
Model A's present-value lifetime cost is about $2,630.23. Model B's is about $2,455.06, so Model B is lower by about $175.17 even though it starts $300 higher. The discounted cumulative costs cross in year 8, and the present value of Model B's operating savings supports a price premium of about $475.17.
Common questions
How do I compare the purchase price and running cost of two appliances?
Use the net upfront cost for each appliance, then add the present value of future electricity and other recurring costs. The better buy is the model with the lower lifecycle cost, not necessarily the lower shelf price.
Where do I find annual kWh on an EnergyGuide label?
The EnergyGuide label gives an estimated yearly electricity use in kilowatt-hours for many covered appliances. Enter that kWh number rather than trying to estimate watts and hours yourself when the label is available.
Why should I replace the EnergyGuide electricity price?
The label cost uses a standard electricity price so shoppers can compare models consistently. Your bill may use a different all-in price after supply, delivery, riders, and taxes, so your own rate gives a better household estimate.
How many years does an efficient appliance take to pay for itself?
The break-even year is the first whole year when the higher-upfront model has no higher cumulative discounted cost. If the efficient model never recovers its premium within the ownership period, the calculator reports no break-even.
What discount rate should I use for an appliance purchase?
A discount rate represents how much less you value future dollars than dollars today. Some people use a savings rate, borrowing rate, or a conservative personal hurdle rate. Use zero if you want a simple undiscounted comparison.
Should water, filters, and maintenance be included?
Yes, include recurring costs that differ between the two models. Put water, filters, cleaning supplies, routine service, or other predictable costs in the other annual costs fields.