Sanitary facilities calculator
Choose the kind of building and enter the number of people, with a male and female split or the 50/50 default. The calculator lists the closet pans, urinals, washbasins and accessible facilities the F4D4 tables require, and checks what the drawings provide when you enter it.
What it checks
The same engine as the calculator in AEC Assistant, with every table checked against NCC 2025 or the Standard it calls up. The same inputs always give the same result.
Background: NCC sanitary facilities guide
You enter
- Building class and the F4D4 table that applies
- Number of people, split by sex or 50/50
- Pans, urinals, basins and accessible compartments provided, for comparison
It reads from
- NCC 2025 Volume One Tables F4D4a to F4D4l and F4D4(3), (11)
- NCC 2025 Volume One F4D5(c) ambulant and F4D6(1)(d) accessible compartments
A worked example
The calculator's example inputs, checked.
Closet pans required
7 pans
50 male · 50 female · +accessible per F4D6
For males: 3 closet pans, 2 urinals, 2 washbasins; for females: 4 closet pans, 2 washbasins, from NCC 2025 Vol One Table F4D4a, plus the accessible unisex and ambulant facilities listed below (F4D5, F4D6).
- People of each sexhalf the people each, the odd one counted as male = 100 ÷ 2 = 50 male, 50 femaleNCC 2025 Vol One F4D3(2)
- Male closet pans3 requiredNCC 2025 Vol One Table F4D4a
- Male urinals2 requiredNCC 2025 Vol One Table F4D4a
- Male washbasins2 requiredNCC 2025 Vol One Table F4D4a
- Female closet pans4 requiredNCC 2025 Vol One Table F4D4a
- Female washbasins2 requiredNCC 2025 Vol One Table F4D4a
Questions
How many toilets does an office need?
The F4D4 tables set the number of pans, urinals and basins by the number of people of each sex, in bands. The calculator reads the band for your numbers, applies the one-basin rule in F4D4(11), and shows the ambulant and accessible compartments F4D5 and F4D6 call for beside the result.
Can I use a 50/50 split?
Yes. Where the split between male and female is not known, the calculator assumes equal numbers. You can enter the real split instead, and at 10 people or fewer F4D4(3) allows a single unisex facility.
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Ask about the amenities on your own project
The free plan answers from the National Construction Code, state building and planning legislation, ABCB handbooks, regulator practice notes and codes of practice, with the clause cited. No credit card.