Calculatium

Irrigation Water Cost Calculator

Estimate monthly irrigation water use and cost from zone flow, session length, watering frequency, water tariff and an allocated fixed charge.

Enter your values

The starting values are editable examples. Results update when you change your inputs.

Example: 10
Example: 30
Example: 12
Example: 2
Example: 0

Your result

Updates as you change your values.

Enter values to calculate.

How it is calculated

Monthly m³ = L/min × minutes per session × sessions per month / 1,000. Variable cost = m³ × tariff. Total = variable cost + allocated fixed charge.

Worked example

A 10 L/min zone run for thirty minutes on twelve occasions uses 3.6 m³. At EUR 2/m³, variable cost is EUR 7.20 before the fixed charge.

Before you calculate

Use the actual total flow of the zone and count the sessions expected in the month. Separate the variable water rate from a deliberately allocated fixed amount. Do not add the same charge in both parts.

Interpreting the result

The model assumes constant flow and a single rate. It does not model tiered billing, rainfall or plant water requirements. It is a cost estimate and does not design pressure, pipework or an irrigation schedule.

Use the units shown beside each field. Monetary fields labelled EUR stay in euros; changing language does not exchange currencies. Results are estimates under the stated assumptions.