Shopping calculators

Enter the room size, ceiling height, ACH target, and the purifier CADR you are considering. The calculator shows the CADR required, the ACH one unit can deliver, and whether you need more than one unit.

Compare two appliance choices by combining the upfront price, EnergyGuide annual kWh, recurring costs, expected resale value, and the time value of money.

Enter the repair quote, likely added life, replacement cost, and annual energy or water cost. The calculator compares both choices over the replacement appliance lifespan in present dollars.

Enter the two vacuum prices, bag pack details, filter schedules, and how often you clean. The calculator shows total ownership cost, cost per cleaning, bag packs to buy, and when the bagless model catches up.

Enter two packages and the cooked portion you plan to serve. The calculator converts shelf prices into cooked edible cost, then shows how whole packages change the checkout total.

Enter the plan price and repair assumptions to compare buying the extended warranty with paying for repairs yourself. The result estimates expected cost, warranty benefit, and the annual failure rate needed to break even.

Compare two flooring options over the same ownership period instead of judging them by the first quote alone. The calculator discounts future upkeep and replacements, then shows the lower-cost option and when the running totals first cross.

Compare the recurring cost of paper towels with the electricity and upfront cost of hand dryers using your own traffic, supply price, labor rate, and utility rate. The result shows operating savings, discounted life-cycle cost, and the point at which a dryer can recover its initial investment.

Compare two printers using the pages you expect to print, the supplies included in the box, replacement yields, paper cost, and maintenance items. The result shows total ownership cost, all-in cost per page, and whether the higher-priced printer catches up during the period.

Enter how your device uses batteries to compare disposable replacements with rechargeable cells, charger cost, electricity, and cycle-life replacements.