Major Purchases Calculators
Model the true cost of significant buying decisions.
24 free calculators in this category
Air Fryer vs Oven Calculator
Work out the energy-cost payback period for an air fryer vs a conventional oven. Enter both prices and per-meal energy use to see when it pays back.
Biweekly Auto Payment Calculator
Calculate interest savings from biweekly versus monthly auto loan payments — see how much an extra payment per year actually saves.
Boat Ownership Cost Calculator
Calculate boat ownership costs including mooring, insurance, fuel, maintenance, and depreciation to estimate annual and lifetime totals.
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
Calculate car depreciation over time. Enter purchase price, annual rate, and years to see remaining value and total lost.
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
Calculate true annual car running cost. Sum insurance, fuel, maintenance, road tax, inspection fees, and depreciation to see real cost of ownership.
Dishwasher Payback Calculator
Calculate payback period for a dishwasher in time saved and water/energy savings vs handwashing. See years to break-even on purchase price.
E-Bike Purchase Calculator
Estimate the payback period of an e-bike for commuting vs a car or public transport — see how many months until the bike pays for itself.
Electric Car vs Petrol Calculator
Compare electric vs petrol car total cost. Enter prices, mileage, fuel and electricity costs to see break-even and annual savings.
Extended Warranty Calculator
Calculate if an extended warranty yields net benefit. Enter warranty cost, expected repair, and probability to see expected value.
Gaming PC vs Console Calculator
Compare gaming PC vs console annual cost including hardware and game purchase costs — see which is cheaper for the way you actually play.
Home Gym Build Cost Calculator
Calculate home gym build cost and years to pay back vs commercial gym membership. Enter equipment cost and maintenance to see payback years vs membership.
Keep or Sell Car Calculator
Compare total cost of keeping versus selling vehicle. Analyze depreciation, maintenance expenses, and repair costs for ownership decision.
Kitchen Renovation Cost Calculator
Calculate realistic kitchen renovation cost including units, worktops, appliances, flooring, plumbing, and trades with contingency buffer.
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 total cost of ownership between motorcycle and car across a multi-year horizon, including fuel, insurance, and maintenance.
New vs Used Car Calculator
Compare 5-year total cost of a new car versus a used car, including depreciation curves and maintenance differences across the period.
Phone Upgrade True Cost Calculator
Compare contract phone upgrade total cost vs SIM-only plus a separate handset purchase — usually the bundled deal is more expensive than it looks.
Car Annual Running Cost Calculator
Work out the true annual cost of running a car from finance, insurance, tax, servicing and fuel. See the yearly and monthly totals. Excludes depreciation.
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
Calculate robot vacuum payback period from time saved on weekly vacuuming — how many months until the time-back covers the price.
Washing Machine vs Laundromat Calculator
Compare lifetime cost between owning a washing machine and using laundromats. Enter washer cost and washer lifespan to see lifetime savings and annual loads.
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.