window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-DGB3NLJK9C');

Calculator

Start your calculation

To start your calculation please select which criteria from the list below you want your project to meet.

Maximum consumption of potable water (litres / person / day)
 
125
110
Your own defined level

Choose a name for this project

The performance target and project name can be changed later. Cookies and JavaScript must be enabled in your browser.
Your browser will store your most recent calculation for two weeks. Once you've finished, you can print your results and/or save them to our database.

Next
Please suppy a Maximum consumption of potable water (litres / person / day)

Add data to your calculation

Click on the small icons by the installation type to add data for that product to your calculation

Project Name

*New buildings must have at least a toilet, washroom taps, a bath or shower, and kitchen taps.

 
Installation Type
Unit of measure
Capacity / flow rate
Use Factor
Fixed Use
Litres / person / day
*Toilet (single flush)
Flush volume (litres)
4.42
0.00

Please select your Single flush Toilets from the drop-down lists on the left.
Once you have made your selections, click the 'Add to calculation' button to add the data into the main calculation table.

Brand
Efficiency Rating:
Single flush toilet
Flush volume
(litres)
Qty
Total
add row
remove add row
remove add row
remove
Average Flush volume (litres)
Add to Calculation
*Toilet (dual flush)
Average effective flushing volume (litres)
1.46
0.00

Please select your Dual flush toilets from the drop-down lists on the left.
Once you have made your selections, click the 'Add to calculation' button to add the data into the main calculation table.

Brand
Efficiency Rating:
Dual flush toilet
Flush volume
(litres)
Qty
Total
add row
remove add row
remove add row
remove
Average Flush volume (litres)
Add to Calculation
*Taps including Basin & Bidet
Flow rate (litres/minute)
1.58
1.58

Please select your Taps (excluding kitchen/utility room taps, bath/shower taps, and external taps) from the drop-down lists on the left.
Once you have made your selections, click the 'Add to calculation' button to add the data into the main calculation table.

Brand
Efficiency Rating:
Tap
Flow Rate
(litres)
Qty
Total
add row
remove add row
remove add row
remove
Average Flow Rate (litres)
Add to Calculation
*Bath (only)
Capacity to overflow (litres)
0.11
0.00

Please select your Bath from the drop-down lists on the left.
Once you have made your selections, click the 'Add to calculation' button to add the data into the main calculation table.

Brand
Efficiency Rating:
Bath
Flow Rate
(litres)
Qty
Total
add row
remove add row
remove add row
remove
Average Flow Rate (litres)
Add to Calculation
*Shower (only)
Flow rate (litres / minute)
4.37
0.00

Please select your Shower from the drop-down lists on the left.
Once you have made your selections, click the 'Add to calculation' button to add the data into the main calculation table.

Brand
Efficiency Rating:
Shower
Flow Rate
(litres)
Qty
Total
add row
remove add row
remove add row
remove
Average Flow Rate (litres)
Add to Calculation
*Kitchen taps
Flow rate (litres / minute)
0.44
10.36

Please select your Kitchen taps from the drop-down lists on the left.
Once you have made your selections, click the 'Add to calculation' button to add the data into the main calculation table.

Brand
Efficiency Rating:
Kitchen sink taps
Flow Rate
(litres)
Qty
Total
add row
remove add row
remove add row
remove
Average Flow Rate (litres)
Add to Calculation
 
Washing machine
Litres / kg dry load
2.1
0.00
 
Dishwasher
Litres / place setting
3.6
0.00
 
Waste disposal unit
Litres / use
3.08
0.00
 
Water softener
Litres / person / day
1.00
0.00
Contribution from Grey Water
Bath, shower, and hand basin usage (l/p/d)
Percentage of used water to be recycled (%)
Greywater available for use (litres/person/day)
Greywater demand (litres/person/day)
Greywater savings (litres/person/day)
Add to Calculation
Contribution from Rain Water
Collection area (m2)
Yield co-efficient and hydraulic efficiency
Rainfall (average mm/year)
Daily rainwater collection (litres)
Percentage collected (%)
Number of occupants
Daily rainwater per person (litres)
Rainwater demand (litres/person/day)
Rainwater savings (litres/person/day)
Add to Calculation

* BS 8515 intermediate approach.

Back
Calculate
New buildings must have at least a toilet, washroom taps, a bath or shower, and kitchen taps.

Your target maximum consumption of potable water is 110 litres per person per day.

Totals

Total Calculated use (litres/person/day)
0
Contribution from greywater (litres/person/day)
0
Contribution from rainwater (litres/person/day)
0
Normalisation factor
0.91
Total internal water consumption (litres/person/day)
0
External water use
0
Total water consumption (Building Regulation 17.K)
0
Back
Print