Free water bill calculator: estimate your monthly water bill from usage, rate, sewer charge, and household size. Compare against average US water costs.
Enter your usage in your chosen unit
Cost per gallon / per CCF / per m³ — check your bill
Often 50-100% of your water rate — see your bill
Monthly flat fee regardless of usage
Number of people in your home
Enter values above to see results
Total Bill = (Usage × Water Rate) + (Usage × Sewer Rate) + Service ChargeUsageMonthly water consumption in selected unitWater RateCost per unit of water consumedSewer RateCost per unit for wastewater/sewer serviceService ChargeFixed monthly fee regardless of usageA water bill has two main variable components — water consumption and sewer/wastewater charges — plus a fixed service charge. Sewer rates are often based on water consumption (the assumption being most water used eventually enters the sewer system). The average US household pays around $70/month for water and sewer combined.
Water bills can be confusing — they include multiple components like consumption charges, sewer fees, and fixed service charges, all billed in different units. This water bill calculator breaks down your total cost clearly and helps you understand exactly what you are paying and why.
Enter your monthly water usage (from your meter reading), the rate per unit (from your bill or utility's rate schedule), sewer rate, fixed charges, and household size. The calculator shows your total monthly bill, per-person cost, daily usage per person, and how your bill compares to the US average.
| Unit | In US gallons |
|---|---|
| 1 CCF / HCF (100 cubic feet) | 748 gallons |
| 1 cubic meter (m³) | 264.17 gallons |
| US average household | ~$70/month (water + sewer) |
Water rate $0.004/gallon, sewer rate $0.003/gallon, a $15 fixed service charge.
About $78/month — roughly $26 per person, or $936 a year.
That's about 100 gallons per person per day, close to the US average of ~$70/month for water and sewer combined.
Same rates, one-third less water used.
$57/month — a $21/month (about $250/year) saving.
The fixed service charge doesn't change, so per-gallon savings only apply to the variable part.
Understanding the breakdown of your water bill — consumption vs. sewer vs. fixed — helps you identify where money goes and where savings are possible. The per-person and daily usage figures also help you benchmark your household's water efficiency.
Many people only enter the water rate but forget the sewer charge, which often adds 50-100% to the bill. Also, confirm whether your meter reads in gallons, cubic feet, or cubic meters — using the wrong unit will give wildly incorrect results. Your bill should specify both the unit and the rate.
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