Major Purchases Calculators
Model the true cost of significant buying decisions.
24 free calculators in this category
Air Fryer vs Oven Calculator
Work out how long an air fryer takes to pay back its price in energy savings, from per-meal kWh for each appliance and your own electricity rate.
Biweekly Auto Payment Calculator
Compare a biweekly auto loan schedule against monthly payments and see the interest saved, the payment amount and how much the term shortens.
Boat Ownership Cost Calculator
Work out the annualised and lifetime cost of owning a boat from purchase price, mooring, maintenance, insurance and depreciation.
Boiler Replacement Savings Calculator
Calculate annual savings and payback period from replacing an old inefficient boiler, given current annual gas bill and efficiency gain.
Car Depreciation Calculator
Project what a car will be worth after a chosen number of years, and see how much of the purchase price the depreciation curve removes.
Car Loan vs Cash Calculator
Compare car loan versus cash purchase including the investment opportunity cost on the cash you'd otherwise tie up in the vehicle.
Car Running Cost Calculator
Add up the annual cost of running a car, separating the cash you actually pay from the depreciation that only becomes real on sale.
Dishwasher Payback Calculator
Work out how long a dishwasher takes to pay back, and how much of that answer rests on what an hour of your time is worth.
E-Bike Purchase Calculator
Work out how long an e-bike takes to pay back against a driven or ticketed commute, from distance, days a week and the cost it displaces.
Electric Car vs Petrol Calculator
See how long an electric car takes to recover its purchase premium through cheaper fuel, from your mileage and your own fuel and electricity prices.
Extended Warranty Calculator
Compare an extended warranty premium against the expected cost of repairs, and see the failure probability at which the two are level.
Gaming PC vs Console Calculator
Compare the annual cost of a gaming PC and a console, spreading hardware over its lifespan and adding what you spend on games each year.
Home Gym Build Cost Calculator
Work out how long home gym equipment takes to pay back against the membership fee it replaces, after annual upkeep.
Keep or Sell Car Calculator
Compare the cost of keeping a car and paying its repairs against financing a replacement, and find the repair bill at which the two are level.
Kitchen Renovation Cost Calculator
Build a kitchen renovation budget from linear metres of units, appliance spend, installation days and a contingency percentage.
Loft Conversion ROI Calculator
Calculate loft conversion ROI from cost, property value uplift, and optional rental income contribution over ownership period.
Motorcycle vs Car Cost Calculator
Compare what a motorcycle and a car cost to own over the years you keep them, covering purchase price, fuel at your own prices, and insurance.
New vs Used Car Calculator
Compare the total cost of a new car and a used equivalent over the years you plan to keep it, covering depreciation and maintenance for each.
Phone Upgrade True Cost Calculator
Compare a bundled phone contract against buying a handset outright on a SIM-only plan, and see how the answer changes with how long you keep the device.
Car Annual Running Cost Calculator
Estimate the total cash a financed car takes over its loan term from the down payment, repayments, insurance and fuel, plus the monthly all-in figure.
Rent vs Buy Calculator
Compare renting versus buying housing costs for any time period. Analyze total expenses, equity buildup, and financial outcomes.
Robot Vacuum Worth It Calculator
Work out how quickly a robot vacuum repays its price in time saved, and how much of that answer rests on what an hour of housework is worth.
Washing Machine vs Laundromat Calculator
Compare the lifetime cost of owning a washing machine against laundromat prices, using your own per-load costs, load count and expected lifespan.
Water Softener ROI Calculator
Calculate water softener ROI from reduced detergent use, longer appliance life, and better cleaning. See years to break-even on purchase.
About Major Purchases Calculators
These calculators help evaluate large purchases beyond the sticker price — factoring in financing costs, depreciation, maintenance, insurance, opportunity cost, and total cost of ownership over the expected useful life of the item.