# Water Usage Calculator - Estimate Household Gallons & Cost > Estimate your household water use in gallons, what it costs each month, and how much runs through your water heater. Free tool from Comfort Pros AZ and CA. URL: https://www.comfortprosaz.com/tools/water-usage-calculator/ Free Tool - Calculator # Water Usage Calculator Estimate household water use, what it costs, and how much of it runs through your water heater. ## Your details Everything updates as you change it. Nothing is sent anywhere. People in the household1 person2 people3 people4 people5 people6+ people Showers per person, per dayEvery other dayOnce dailyTwice daily Average shower length5 minutes8 minutes10 minutes (average)15 minutes20+ minutes Showerhead typePre-1994 (5.0 gpm)Standard (2.5 gpm)Efficient (2.0 gpm)WaterSense low-flow (1.75 gpm) Flow rate in gallons per minute. Anything installed before 1994 is likely 5.0 gpm. Toilet typePre-1994 (3.5 gal/flush)Standard (1.6 gal/flush)WaterSense (1.28 gal/flush)Dual flush (1.0 gal average) Landscape wateringNone / desert landscapingSmall yard or drip systemMedium lawnLarge lawn Gallons per week during the dry season. Swimming poolNo poolSmall poolMedium poolLarge pool Gallons lost to evaporation each month. Desert summers run at the high end. Water rate(/1,000 gal) $ Check a recent bill. Combined water and sewer charges are usually higher than water alone. Estimated monthly water use 4,110 gallons Estimated monthly cost $20.55 Per person, per day 46 gal Through your water heater 2,058 gal/mo Low-flow fixtures would save about $4.10 /month Swapping showerheads and older toilets is the cheapest water saving available, and it also cuts the load on your water heater. ### Heavy hot water demand At this volume a single 40 gallon tank tends to run short during morning peaks. Worth comparing a larger tank against a tankless unit before yours fails. ### Bill higher than this estimate? That gap is almost always a leak. We can pinpoint it, including slab leaks, and tell you what it will take to fix. Estimates use typical fixture flow rates and average habits. Actual use varies with appliance efficiency, irrigation controllers and household routine. A large gap between this estimate and your bill is worth investigating as a leak. Related services ## What this usually leads to Water Heater Services [/water-heater-services/ →](/water-heater-services/) Emergency Plumbing [/emergency-plumbing/ →](/emergency-plumbing/) Drain Cleaning & Hydro Jetting [/drain-cleaning-hydro-jetting/ →](/drain-cleaning-hydro-jetting/) More tools ## Other free tools on this site Sizing ### BTU Calculator Estimate the cooling capacity a room actually needs, so you can sanity-check any system size you are quoted. Open [BTU Calculator →](/tools/btu-calculator/) Diagnostic ### HVAC Service Finder Answer five questions and find out which HVAC service your situation actually calls for. Open [HVAC Service Finder →](/tools/hvac-service-finder/) Running costs ### Energy Cost Estimator Estimate what your air conditioner costs to run each month, and what a higher-efficiency system would cost instead. Open [Energy Cost Estimator →](/tools/energy-cost-estimator/) Diagnostic ### Plumbing Service Finder Describe the symptom and find out which plumbing service matches it. Open [Plumbing Service Finder →](/tools/plumbing-service-finder/) ![](/images/hero/candid-wide-photo-of-a-technician-shaking-hands-wi.webp) Same-day appointments available ## Ready for an Honest Number? Run a real load calculation online, or call the team in your state. Flat-rate pricing either way, and nobody shows up to sell you something bigger than you need. Get Your TrueQuote [https://quote.comfortprosaz.com →](https://quote.comfortprosaz.com) (480) 435-2334 [tel:+14804352334 →](tel:+14804352334) Flat-rate pricing, no upsells Parts and labor warranty Licensed in AZ and CA California team: (818) 690-7951 [tel:+18186907951 →](tel:+18186907951) · Text us: (818) 489-2826 [sms:+18184892826 →](sms:+18184892826)