Calculators
Every calculator runs entirely in your browser — no server calls, no data collection. Each one states its assumptions and sources them; where a figure genuinely varies by product, it's a field you fill in yourself rather than a number we guess for you.
- Diapers Calculator
Figure out how many changes, boxes, and reorders your baby's stage actually adds up to each year, based on the American Academy of Pediatrics' own guidance.
- Dishwasher Pods Calculator
Figure out how many pods, packs, and reorders your household's dishwasher runs actually add up to each year, based on your own runs per week and pack size.
- Dog and Cat Food Calculator
Figure out how many servings, bags, and reorders your pet's food actually adds up to each year, based on the same weight-driven formula veterinarians use.
- HVAC Filter Calculator
Figure out how often your HVAC filter actually needs replacing and how many you'll go through a year, adjusted for pets, allergies, and filter thickness.
- Laundry Detergent Calculator
Figure out how many loads, packs, and reorders your household's laundry detergent actually adds up to each year, based on your own loads per week and pack size.
- Paper Goods Calculator
Turn your household's own toilet paper and paper towel usage into rolls per year for each, since no reliable per-person average exists to start from instead.
- Trash Bags Calculator
Figure out how many gallons and bags a year your household's trash actually adds up to, for whatever can size you use, starting from EPA's own waste data.
- Water Filter Calculator
Figure out how often your pitcher or faucet filter actually needs replacing, based on your household's water use and your filter's own stated capacity.