# Water leak cost calculator

- Human page: https://happytails.ai/en/calculators/water-leak-cost-calculator/
- Markdown: https://happytails.ai/en/calculators/water-leak-cost-calculator.md
- Structured JSON: https://happytails.ai/agents/en/calculators/water-leak-cost-calculator/index.json
- Visibility: public

## Tool capabilities

| Property | Value |
| --- | --- |
| Tool ID | `water-leak-cost-calculator` |
| Category | calculators |
| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |
| Browser execution | Automatic updates after valid input or file selection. |
| Browser processing | Browser; see tool notes for network behavior. |
| HTTP API | Not callable through HTTP. |
| Browser-agent interface | run_current_tool |

### Implementation notes

Calculated on your device for leaks up to 10,000 drips a minute or 1,000 L collected, over 1 to 3,650 days, using the prices you enter.

### Inputs and settings

No free-text input is required. Use the file inputs and/or settings below.

| Setting | Meaning | Control type | Default | Constraints |
| --- | --- | --- | --- | --- |
| `method` | Leak measurement | select | "Drips per minute" | Allowed: Drips per minute, Measured container fill |
| `dripsPerMinute` | Drips per minute | number | 60 | min=0 max=10000 step=any |
| `dripVolume` | Volume per drip (mL) | number | 0.25 | min=0.01 max=10 step=any |
| `containerUnit` | Collected volume unit | select | "mL" | Allowed: mL, L, US gal, Imp gal |
| `containerVolume` | Water collected | number | 500 | min=0 step=any |
| `fillTimeUnit` | Collection time unit | select | "minute" | Allowed: second, minute, hour |
| `fillTime` | Time to collect it | number | 30 | min=0 step=any |
| `days` | Days until the leak is fixed | number | 30 | min=1 max=3650 step=1 |
| `tariffBasis` | Prices are | select | "per m³ (1,000 L)" | Allowed: per m³ (1,000 L), per 1,000 US gal, per 100 ft³, per 1,000 Imp gal |
| `waterPrice` | Water price | number | 2 | min=0 max=100000 step=any |
| `sewerPrice` | Wastewater price | number | 1.5 | min=0 max=100000 step=any |

### Browser-agent workflow

1. Open the human page in a browser that supports WebMCP.
2. Discover the interface exposed by that page; use its actual schema.
3. Select files on the page first when the tool requires files.
4. Call `run_current_tool` with valid input and settings.
5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.

Calls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.

### Planning specification

Up to 10,000 drips a minute at 0.01 to 10 mL per drip, or up to 1,000 L collected in 1 second to 7 days; 1 to 3,650 days; prices from 0 to 100,000 per selected volume. Calculated on your device; download a JSON report and a CSV of results.

This describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.

### Complete machine-readable capability record

```json
{
  "id": "water-leak-cost-calculator",
  "category": "calculators",
  "built": true,
  "requirements": "Up to 10,000 drips a minute at 0.01 to 10 mL per drip, or up to 1,000 L collected in 1 second to 7 days; 1 to 3,650 days; prices from 0 to 100,000 per selected volume. Calculated on your device; download a JSON report and a CSV of results.",
  "implementation": {
    "fields": [
      {
        "key": "method",
        "label": "Leak measurement",
        "value": "Drips per minute",
        "type": "select",
        "values": [
          "Drips per minute",
          "Measured container fill"
        ]
      },
      {
        "key": "dripsPerMinute",
        "label": "Drips per minute",
        "value": 60,
        "type": "number",
        "min": 0,
        "max": 10000,
        "step": "any",
        "showWhen": {
          "method": [
            "Drips per minute"
          ]
        }
      },
      {
        "key": "dripVolume",
        "label": "Volume per drip (mL)",
        "value": 0.25,
        "type": "number",
        "min": 0.01,
        "max": 10,
        "step": "any",
        "help": "USGS uses 0.25 mL for a kitchen faucet drip. A measured container fill is more reliable.",
        "showWhen": {
          "method": [
            "Drips per minute"
          ]
        }
      },
      {
        "key": "containerUnit",
        "label": "Collected volume unit",
        "value": "mL",
        "type": "select",
        "values": [
          "mL",
          "L",
          "US gal",
          "Imp gal"
        ],
        "showWhen": {
          "method": [
            "Measured container fill"
          ]
        }
      },
      {
        "key": "containerVolume",
        "label": "Water collected",
        "value": 500,
        "type": "number",
        "min": 0,
        "step": "any",
        "showWhen": {
          "method": [
            "Measured container fill"
          ]
        }
      },
      {
        "key": "fillTimeUnit",
        "label": "Collection time unit",
        "value": "minute",
        "type": "select",
        "values": [
          "second",
          "minute",
          "hour"
        ],
        "showWhen": {
          "method": [
            "Measured container fill"
          ]
        }
      },
      {
        "key": "fillTime",
        "label": "Time to collect it",
        "value": 30,
        "type": "number",
        "min": 0,
        "step": "any",
        "showWhen": {
          "method": [
            "Measured container fill"
          ]
        }
      },
      {
        "key": "days",
        "label": "Days until the leak is fixed",
        "value": 30,
        "type": "number",
        "min": 1,
        "max": 3650,
        "step": 1
      },
      {
        "key": "tariffBasis",
        "label": "Prices are",
        "value": "per m³ (1,000 L)",
        "type": "select",
        "values": [
          "per m³ (1,000 L)",
          "per 1,000 US gal",
          "per 100 ft³",
          "per 1,000 Imp gal"
        ]
      },
      {
        "key": "waterPrice",
        "label": "Water price",
        "value": 2,
        "type": "number",
        "min": 0,
        "max": 100000,
        "step": "any",
        "help": "Per the volume chosen above, from your bill."
      },
      {
        "key": "sewerPrice",
        "label": "Wastewater price",
        "value": 1.5,
        "type": "number",
        "min": 0,
        "max": 100000,
        "step": "any",
        "help": "Enter 0 if wastewater is not charged by volume."
      }
    ],
    "registrationFamily": "measured-quantity-form-reference",
    "input": false,
    "live": true,
    "presentation": "metrics",
    "note": "Calculated on your device for leaks up to 10,000 drips a minute or 1,000 L collected, over 1 to 3,650 days, using the prices you enter.",
    "experience": {
      "automatic": true,
      "single": true,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "Leak measurements",
      "placeholder": "Use the fields below",
      "help": "This calculator uses the measurement fields only. Results update as you type. Up to 1,000,000 characters.",
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}
```

## Page guide

Estimate how much water a dripping tap or running leak wastes per day, month and year, and what it costs at your water and wastewater prices.

How can we improve this tool?

Report a problem or share an idea.

Please leave out private information. Your message and the tool name go to our team via PostHog.

### How to use Water leak cost calculator

1. Count drips per minute, or time how long the leak takes to fill a container.
2. Enter the days until the leak is fixed.
3. Enter your water and wastewater prices and the volume they are charged per.
4. Review the water lost and the cost, then download the report or CSV.

## Useful next steps

- [Rainfall collection calculator](https://happytails.ai/en/calculators/rainfall-collection-calculator/) ([Markdown](https://happytails.ai/en/calculators/rainfall-collection-calculator.md))

- [Liters to gallons](https://happytails.ai/en/unit-converters/liters-to-gallons/) ([Markdown](https://happytails.ai/en/unit-converters/liters-to-gallons.md))

- [Hot water energy calculator](https://happytails.ai/en/calculators/hot-water-energy-calculator/) ([Markdown](https://happytails.ai/en/calculators/hot-water-energy-calculator.md))

## Measure the leak

Count drips for one minute, or catch the leak in a measuring jug and time it. A timed container gives a more reliable rate because drip size varies. The USGS Water Science School uses 0.25 mL for a kitchen faucet drip (checked 16 October 2026), so 60 drips a minute is 15 mL a minute, or 21.6 litres a day.

### From rate to cost

The daily volume is scaled to a 365-day year and a month of one twelfth of a year. Cost multiplies the volume by your water and wastewater prices, divided by the volume they apply to, such as per cubic metre or per 1,000 US gallons. Money is rounded to 2 decimals.

### Limits

The leak rate is assumed constant. Fixed charges, tiered prices and taxes are not included. Unit conversions use NIST SP 811 factors.