Seven NCC calculators. Free, no account.
Deterministic code, not a model. Every table is transcribed from NCC 2022 Amendment 2 and covered by unit tests, so the same inputs always give the same result and any result can be reproduced without an assistant in the loop.
The seven instruments
Each one answers a question that comes up on most jobs, against the provision that governs it.
Stair calculator
Riser, going and 2R+G against NCC D3D14, Housing Provisions 11.2 and AS 1428.1.
Open the calculatorRamp calculator
Gradient, landings and handrails against AS 1428.1:2021.
Open the calculatorLuminance contrast
The 30% contrast check between adjoining surfaces, to AS 1428.1.
Open the calculatorLight and ventilation
Natural light and ventilation areas under NCC Part F6.
Open the calculatorOccupancy and exits
Occupant numbers from Table D2D18, exit widths and travel distances.
Open the calculatorSanitary facilities
Pan, basin and accessible counts for every class, from the F4D4 tables.
Open the calculatorGutters and downpipes
Roof drainage sizing from the Housing Provisions tables and AS/NZS 3500.3.
Open the calculator
How a result reads
Inputs, then a drawing
Type the riser, the going, the width or the floor area and the diagram redraws as you go. The inputs sit in the address bar too, so a result can be sent as a link and opens exactly as you left it.
A verdict line
One sentence says whether the design complies and, when it does not, which limit it fails and by how much. There is no model in the loop: the same inputs always give the same answer.
A receipt that names its table
Below the verdict, the receipt lists the table and clause each figure was read from, so the result can be checked against the Code. Under it, one button hands the result to the assistant to talk through what it means for your project.
Ask it the question you were about to look up
Free for NCC 2025 and NCC 2022 with citations, and planning information for any address in Australia. No credit card.