Formula and example
How it is calculated
m³ = litres × number of users × days / 1,000; cost = m³ × price
Worked example
120 l per day gives 3.6 m³ in 30 days, costing €18 at €5/m³.
Things to check
- A month is treated as 30 days and a year as 365 days. Standing charges and energy for hot water are excluded.
- Use one currency consistently. Examples use euros; the calculation works with any currency.