Choosing Right
What's the Difference Between EV Readiness Check and Other EV Calculators?
Quick Answer
Most EV calculators answer cost: what you'd save on fuel, which incentives apply, what the payback looks like. The EV Readiness Check answers fit: whether the place you park and the outlet you have can keep up with how far you actually drive. Both are useful. The difference matters most when the honest answer is "not yet."
If you've been looking into an EV, you've probably opened two or three of these tools already. They look similar from the outside — a few questions, a result. But they're answering genuinely different questions, and which one you need depends on what's actually stopping you.
Almost every EV calculator starts with the car
Open a utility’s EV calculator and the first thing it wants is a vehicle. Pick one from a catalog, tell it roughly how far you drive, tell it your electricity rate, and it returns a number: what you’d spend on electricity, what you’d save against gas, which rebates you qualify for, how long until the math turns positive.
That is a genuinely useful calculation, and the tools that do it are generally good at it. If you have a driveway with a charger on it and you’re deciding between two cars, a cost calculator is exactly the right instrument.
But look at what it assumed before the first question. It assumed the charging works. Every one of those outputs rests on the premise that the car will be full each morning — and for a large share of people looking at their first EV, that premise is precisely the thing in doubt.
This one starts with where you park
The EV Readiness Check asks four things: where the car sits overnight, what you can plug into there, how many hours it’s parked, and how far you actually drive in a week. It doesn’t ask which car you want until later, because the car isn’t what decides it.
From those answers it works out two numbers and compares them. The first is how much range your setup puts back into the battery over a week. The second is how much range your driving takes out. If the first is comfortably larger, you’re fine. If it isn’t, no amount of fuel-cost savings makes the week work.
That comparison is the whole product, and it’s a different question from “what would this cost?” — close enough to look like the same thing from the outside, far enough apart to give opposite answers to the same person.
The difference that matters most: a cost tool can’t tell you no
This is the part worth understanding, because it isn’t about which tool is better built.
Utility EV calculators are deployed by utilities. An EV is a large new electricity customer, and most utilities run rate plans and rebate programs they’d like people enrolled in. Clean Power Research, which makes the WattPlan tool used by utilities across the country, describes the product’s purpose in its own words as helping them “increase program engagement and participation.”
That is not a criticism, and it isn’t dishonesty. The cost arithmetic in those tools is sound and the incentive data is better than ours. But a tool built to drive adoption is not built to discover that adoption is a bad idea for you. It will tell you what an EV costs. It will rarely tell you to skip one.
We take the opposite position, which is easy for us because we don’t sell cars, chargers, electricity or referrals. A readiness check that never says no isn’t measuring anything. So the result here can come back as not ready, or planning needed, or point you at a plug-in hybrid instead — and for a meaningful share of people, it does.
Quick Check
Will your parking and your outlet keep up with your week?
Five questions about where you park and how far you drive. You get a straight answer — including “not yet” if that’s the honest one.
Take the EV Readiness Check →Takes about 2 minutes. No email required.
Where the utility calculators are better than we are
Three places, and they’re not small.
Incentives and rebates. A utility tool is wired into its own rate schedules and rebate programs. It can tell you precisely which offers apply to your account and what they’re currently worth. We work from national and state-level figures, which is a coarser instrument.
Rate plan detail. If your utility offers three time-of-use plans with different peak windows, their calculator knows all three. Ours reasons about rate plans in general terms.
Vehicle catalogs. The larger utility tools carry well over a hundred vehicles. We carry fewer, chosen for the charging characteristics that matter to the fit question rather than for completeness.
So if you already know an EV works where you park, and what you want is an accurate number for your specific utility territory, their tool is the better one. Use it. We’d rather tell you that than pretend otherwise.
Level 1 is an input to them and the subject for us
Most cost calculators let you choose Level 1 or Level 2 so they can price the electricity correctly. It’s a dropdown.
For someone whose only option is the wall outlet in their garage, that dropdown is the entire question. A standard 120V outlet delivers roughly 1.12 kW to the battery once charging losses are accounted for. Over a 12-hour overnight that’s about 55 miles of range for an efficient sedan at 4.1 miles per kWh, and about 28 miles for a full-size electric pickup at 2.1. Same outlet, same twelve hours, and one of those drivers is comfortable while the other is underwater by Wednesday.
A cost tool will happily price either scenario. Neither result tells you which one you’re in. If that’s your situation, we go into it in more detail in do I need a Level 2 charger, or you can just run your own numbers.
Averages hide the week that breaks
Cost tools work from a monthly or annual mileage figure, because that’s all the money question needs. Multiply miles by cost per mile and you have your answer.
Charging doesn’t fail on average. It fails in a particular week, when three long days land in a row and the overnight charge never catches up, so each morning starts lower than the last. A driver averaging 40 miles a day might never notice, or might get caught every few weeks, depending entirely on how those miles are distributed and how much slack the overnight window leaves.
Here are two drivers with identical weekly mileage — 350 miles, 50 a day on average — on the same standard outlet, which puts back about 47 miles over a twelve-hour overnight. The only difference is how those miles fall across the week.
That’s why the full report walks through a week day by day rather than handing you a monthly figure. The average tells you about the bill. The worst week tells you whether you’ll be happy.
What you’re left holding afterwards
There’s a practical difference that only shows up once you try to act on the answer.
A cost calculator gives you a result on screen. That’s appropriate — you asked what something costs and it told you. But the next steps after “an EV would save me money” usually involve other people: a dealer who wants to talk about range, an electrician quoting for a circuit, a landlord or an HOA board deciding whether you can install anything, a partner who isn’t convinced. None of those conversations go well with a screenshot of a savings figure.
What those conversations need is specific. An electrician wants to know the circuit you’re asking for and why — not that you’re interested in an EV. A dealer who assumes you need Level 2 is much harder to redirect without a number in your hand. A board that has turned down charger requests before responds differently to a written case than to an enthusiastic one.
That’s the reasoning behind the paid report here: a PDF of the whole assessment, and an installer spec sheet when the result involves a wall outlet or a new circuit. The free score answers your question. The report is the thing you hand to someone else. Whether that’s worth paying for depends entirely on whether you have one of those conversations coming up — if you don’t, the free result is genuinely the whole answer and you should take it and go.
Worth saying plainly: that’s also the honest reason this site can say “don’t buy an EV” without flinching. Nobody pays us to produce a yes. No manufacturer, no charger company, no utility, no dealer referral. The only thing on sale is a fuller version of the same answer, and that answer is as often “not yet” as it is “go ahead.”
Which one should you actually use?
A short decision, and it depends on what’s stopping you.
You have a driveway or garage and can install whatever you need. Charging isn’t your question — cost is. Go straight to your utility’s calculator, and check the Alternative Fuels Data Center for current incentives.
You have a wall outlet and no idea whether it’s enough. That’s the question we were built for. Start here, then price it with their tool once you know it works.
You park on the street, in an apartment lot, or somewhere with no plug at all. Start here too, and expect a real possibility that the answer is not yet. That answer is worth having before you spend forty thousand on finding out.
The two tools aren’t really competitors. One answers what it costs, the other answers whether it works, and most people end up wanting both — just in that order. If you’re still at the first question, the readiness check takes about two minutes and doesn’t ask for an email.
Ready to find out if you’re EV ready?
Answer 5 quick questions about your charging access, daily mileage, and home setup. You’ll get a clear answer based on your actual situation — not assumptions.
Take the EV Readiness Quiz →Frequently asked questions
Should I use my utility's EV calculator or this one?
Use both, in this order. If you're not yet sure an EV works where you park, start here — it answers whether your charging keeps up with your driving, which is the question that stops most people. Once you know it works, your utility's calculator is better than we are at the money: it knows your specific rate plans, your local rebates, and often has a far bigger vehicle catalog. They answer different questions and they're not really competitors.
Why would a utility's calculator not tell me an EV is a bad idea?
Because of who builds it and why. Utilities deploy these tools to grow EV adoption — more EVs means more electricity sold, and most utilities have programs they want customers enrolled in. Clean Power Research, which makes the widely-deployed WattPlan tool, describes its purpose as helping utilities "increase program engagement and participation." That's not dishonest, and the cost math in those tools is generally sound. But a tool built to drive adoption will rarely return "this won't work for you," because that isn't what it was built to find out.
What does "fit" actually mean here?
Whether the electricity you can get into the car each week covers the miles you drive each week. That depends on four things: where you park, what you can plug into there, how many hours the car sits plugged in, and how far you drive. A standard 120V outlet delivers about 1.12 kW to the battery after charging losses. Over a 12-hour overnight that's roughly 55 miles of range for an efficient sedan and about 28 for a full-size electric pickup. Whether that's enough is the entire question.
Do you include incentives and rebates?
Not in the depth a utility tool does, and that's a real limitation. Utility calculators are connected to their own rate schedules and rebate programs, so they can tell you exactly which offers apply to your account. We work at the level of national and state figures. If your decision hinges on a specific local rebate, check with your utility directly or use their calculator for that part.
Can the EV Readiness Check tell me not to buy an EV?
Yes, and it does. The result can come back as not ready, or as planning needed, or can point you toward a plug-in hybrid or a regular hybrid instead. Roughly speaking, if your weekly driving outruns what your parking situation can put back into the battery, and there's no workplace or convenient public charging to close the gap, an EV will create friction you'll feel every week. A readiness check that never returns a negative isn't measuring anything.
Why do monthly averages miss things?
Because charging failures happen in specific weeks, not on average. Most cost tools work from a monthly or annual mileage figure, which smooths out the pattern that actually breaks a setup: several long days in a row, where the overnight charge never catches up and the deficit compounds. A driver averaging 40 miles a day can be completely fine, or stranded on a Thursday, depending on how those miles are distributed. Looking at the week day by day is the only way to see it.