Plumbing Calculators
15 calculators15 free calculators for plumbing homeowners.
Dishwasher Running Cost
Calculate what it costs to run your dishwasher — water, sewer, and electricity, per cycle and per year — and see how it compares with washing dishes by hand (running tap vs. two-basin).
Greywater System Cost
Estimate the cost to install a greywater system — reusing laundry, shower, and sink water for irrigation. See prices by system type (laundry-to-landscape, branched-drain, pumped/treated), complexity, and permit — and why greywater is a conservation move, not a fast money-saver.
Hydro Jetting vs. Snaking Cost
Compare hydro jetting vs. snaking a clogged drain — per job and over 5 years. Snaking is cheaper today ($150–$500), jetting cleans the pipe for 2–3 years ($600–$1,400). See which wins for your clog.
Kitchen Sink Replacement Cost
Estimate the cost to replace a kitchen sink by material (stainless, composite, fireclay) and mount type (drop-in, undermount, farmhouse). See why changing the mount type — the countertop or cabinet work — is the big hidden cost, with faucet and disposal folded in.
Plumbing Fixture Upgrade Cost
Estimate the cost to upgrade your plumbing fixtures — faucets, toilet, sinks, showerhead, shower valve, bathtub, or garbage disposal. Pick how many of each at standard or premium quality and get the installed cost (fixture + labor) per fixture and a total.
Septic Tank Pumping Frequency
Find out how often to pump your septic tank, based on EPA pumping-frequency data for your tank size and household. Accounts for a garbage disposal, and gives your next pump-out due date.
Shower Pan Replacement Cost
Estimate the cost to replace a shower pan, installed — by pan type (prefab acrylic/fiberglass base, solid-surface, or custom tiled), shower size, and whatever water damage is found under the old pan. See why the subfloor is the wild card.
Sump Pump Replacement Cost
Estimate the cost to replace a sump pump in an existing pit — by pump type and horsepower, DIY or professional install, plus battery backup, water alarm, and check valve.
Tankless vs. Tank Water Heater
Compare a tankless water heater to a traditional storage tank — upfront cost, annual energy savings, payback, and 20-year total. See why gas tankless pays back slowly but still often wins over 20 years, and why electric homes are usually better off with a standard tank.
Washer & Dryer Running Cost
See what it costs to run your washer and dryer — per load and per year — and compare standard-electric, heat-pump, and gas dryers side by side. Find the cheapest option for your rates and usage, and why washing cold saves the most.
Water Filtration System Cost
Estimate the true cost of a home water filtration system — pitcher, reverse osmosis, whole-house, or softener — including the filters and salt you buy for years, not just the sticker price.
Water Heater Replacement Cost
Estimate the cost to replace your water heater by type — gas or electric tank, tankless, or heat-pump (hybrid) — scaled to your household size and install complexity, with current rebate and efficiency guidance.
Water Main Break Repair Cost
A broken water line to your house costs $400–$1,500 to spot-repair or $2,000–$12,500 to replace. Compare both by line length and method — and see which one your pipe's condition actually calls for.
Well Water System Cost
Estimate the yearly cost of owning a private well — annual water testing, treatment consumables, periodic inspection, and the pump reserve most owners forget until the pump fails.
Whole-House Water Softener Cost
Estimate the installed cost of a whole-house water softener — salt-based, dual-tank, or salt-free — and the grain capacity your household actually needs, sized from your household size and water hardness.
About Plumbing Calculators
Plumbing problems are among the most expensive home repairs, often costing thousands of dollars when you call a professional without understanding what you actually need. The difference between a simple fix and a complete system replacement frequently comes down to knowing the right measurements and calculations upfront—whether that's pipe sizing for a new bathroom, water pressure requirements, drain slope specifications, or the actual cost of materials you'll need. Our plumbing calculators help you determine exactly what's required before you hire a contractor, which means you'll get accurate quotes, avoid unnecessary work, and make informed decisions about repair versus replacement.
Knowing these numbers also helps you understand if a contractor's recommendation makes sense or if you're being oversold. Most homeowners drastically underestimate water usage and oversize pipes, leading to low pressure and wasted money on materials and installation. Similarly, many people don't realize that drain lines must slope at precise angles—usually 1/4 inch per foot—or they'll fail repeatedly, becoming a recurring expense.
Our calculators handle the math that building codes require, from gallons-per-minute calculations to fixture unit counts that determine your main water line size. By running these numbers yourself, you'll enter any conversation with a plumber or contractor with confidence, know whether their proposed solution is reasonable, and have the data to get competitive bids.