UK Water Bill Calculator

Introduction

The UK Water Bill Calculator estimates a metered water bill from annual usage, clean water rate, wastewater rate, return-to-sewer percentage, standing charges, and drainage charges. It helps make water bills easier to inspect.

About this uk water bill tool

Metered water bills can combine several charges: clean water supplied, wastewater assumed to return to sewer, fixed standing charges, and sometimes surface water drainage. Rates vary by water company, so entering the values from your bill gives a better estimate than using national averages.

How this tool works

Enter annual usage in cubic metres, the clean water and wastewater rates, the return-to-sewer percentage, and annual fixed charges. The calculator estimates clean water cost, wastewater cost, fixed charges, annual total, monthly equivalent, and daily equivalent.

1. Enter your annual metered water usage in cubic metres, or convert litres by dividing by 1,000.
2. Add the clean water and wastewater rates from your water company's charges scheme or bill.
3. Include annual standing charges and any surface water drainage charge to see monthly and annual estimates.

When to use this tool

Use it when checking a new metered bill, modelling lower usage, comparing homes, or deciding whether a meter estimate deserves a closer look. For unmetered, assessed, social tariff, or special drainage arrangements, confirm the charging basis with your water company.

Good to know

• Water and wastewater rates vary by region and supplier, and some homes use assessed or rateable-value charges instead of metered usage.
• Wastewater is often charged on an assumed return-to-sewer percentage, so adjust that percentage if your bill states a different basis.