34 free calculators

Discover all our calculators by category

Accurate tools for EV charging, ownership costs, and home energy — no sign-up, results as you type. Pick a tool to get started.

EV Charging EV Finance & Ownership Home Energy Solar & Storage

EV Charging

Charging cost, time, range — the everyday EV numbers.

Cost & Savings5

EV Charging Cost Calculator

Estimate the cost to charge your EV at home or in public based on battery size, charge level, and your electricity rate.

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Tesla Charging Cost Calculator

What it costs to charge a Tesla at home vs a Supercharger — by model, charge level, and your electricity rate. See the Supercharger premium and cost per mile.

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Monthly EV Charging Cost Calculator

What does it cost to charge an electric car at home? Estimate your monthly EV charging cost from how much you drive — plus the monthly savings versus a gas car.

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Solar Panels for EV Charging Calculator

Find how much solar capacity and how many panels you'd need to offset your EV's annual charging energy.

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Off-Peak EV Charging Savings Calculator

See how much you save by charging your EV off-peak on a time-of-use plan versus a flat electricity rate.

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Speed & Range2

EV Charging Time Calculator

How long it takes to charge an electric car (EV) on Level 1, Level 2, or DC fast charging — from any starting battery level.

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EV Range Calculator

Estimate real-world driving range from battery size and efficiency, adjusted for temperature and speed.

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Home Install & Wiring2

Level 2 Charger Breaker Size Calculator

Size the breaker and wire for a Level 2 EV charger using the NEC 125% continuous-load rule.

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Home EV Charger Installation Cost Calculator

What electric car charger installation costs at home — Level 2 charger, panel, wiring, and labor — as a planning range.

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EV Finance & Ownership

Loans, total cost of ownership, insurance, tax credits.

Financing3

EV Loan & Payment Calculator

Calculate monthly payments, total interest, and payoff for financing an electric vehicle.

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EV Tax Credit Calculator

See what an EV tax credit is worth — effective price, plus the point-of-sale vs tax-time impact on your payment and interest.

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EV Lease Payment Calculator

Thinking of leasing an electric car? Calculate a monthly EV lease payment from price, residual value, money factor, and term — and see the APR it works out to.

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Ownership Cost5

EV vs Gas Cost of Ownership Calculator

Compare the total cost of owning an EV versus a gas car over time — fuel, maintenance, and financing.

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EV Depreciation Calculator

EV depreciation, projected: see an electric car's resale value and total depreciation over the years you own it.

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True Cost to Own an EV Calculator

Add up the real monthly cost of owning an EV — payment, insurance, home charging, and maintenance.

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EV Insurance Cost Estimator

Estimate what it costs to insure an electric car by value, age, coverage, and state — see the EV surcharge and whether full coverage is still worth it.

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EV Battery Replacement Cost Calculator

Estimate the cost to replace an EV battery pack by size and pack price, split into pack and labor — plus a warranty check against the 8-year / 100,000-mile minimum.

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Home Energy

Heat pumps, electricity costs, electrification payback.

Heat Pumps4

Mini Split Sizing Calculator

Find what size mini split you need for a room in BTU and tons — from square footage, climate, sun, and use — rounded to a real unit size, with an oversizing warning.

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Heat Pump Cost Calculator

Estimate heat pump installation cost by size and type — ducted, ductless, or geothermal — with an equipment, labor, and adder breakdown and a cost-by-type comparison.

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Heat Pump Payback Calculator

Estimate how many years until a heat pump pays for itself versus your current heating system — electric, gas, oil, or propane.

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Heat Pump Sizing Calculator

Estimate the heat pump size (BTU and tons) your home needs, adjusted for square footage, climate, and insulation.

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Generators2

Generator Sizing Calculator

Size a home generator by picking the appliances you want to back up — running watts plus the largest startup surge.

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Generator Runtime & Fuel Calculator

Estimate how long a generator runs on a tank and its fuel use and cost — by load level and fuel type.

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Water Heating1

Water Heater Replacement Cost Calculator

Estimate water heater replacement cost by type — electric or gas tank, tankless, or heat-pump — with a unit-plus-install breakdown and a cost-by-type comparison.

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Electricity Bills3

Home Energy Score Calculator

Get a 0–100 home energy score versus similar homes — plus a rough monthly bill — from a few quick questions about your home.

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Electricity Cost Calculator

Calculate the running cost of any appliance from its wattage, hours of use, and your electricity rate.

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Electricity Bill Calculator

An electricity bill calculator: estimate your monthly electric bill from your major loads — and see which ones drive the cost.

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Electrical Panel1

Home Electrical Load Calculator

Estimate your home's electrical demand with the NEC load-calculation method and see if your 100A or 200A service has room.

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Solar & Storage

Solar payback, panels needed, and home-battery sizing.

Solar4

Solar Loan Calculator

Estimate solar loan payments and the true cost of financing — including the dealer fee low-APR loans add — and check if the payment beats the electric bill it offsets.

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Solar Panel Payback Calculator

Estimate how many years a solar system takes to pay for itself from the electricity it offsets — and its lifetime savings.

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How Many Solar Panels Do I Need? Calculator

Find how many solar panels and what system size you need to cover your electricity use — from your annual kWh or your monthly bill.

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Solar Panel Output Calculator

Estimate how much electricity a solar system produces per day, month, and year — with seasonal range and lifetime output after degradation.

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Home Battery2

Home Battery Backup Sizing Calculator

Size a home battery backup — find the battery storage you need to back up your home from your daily energy use and the days of backup you want.

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Home Battery Cost Calculator

Estimate home battery and Powerwall installation cost by capacity and price per kWh — with equipment, install, and per-kWh breakdown and the cost net of a rebate.

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