Enter dimensions to calculate…
Advanced stair calculator using real building codes (IRC, Eurocode, UK, Canada). Calculates number of steps, total run, angle, stringer length, and compliance. Ideal riser: 15–19 cm, tread: 22–30 cm. Includes headroom check and 2R + T rule (60–65 cm).
The Stair Calculator on GCalculate.com is a free, intuitive tool crafted for homeowners, contractors, architects, and DIY enthusiasts to design safe, code-compliant staircases for homes, decks, or commercial spaces. By entering the total rise (vertical height between floors) and preferred step dimensions, users can calculate essential measurements like riser height, tread depth, number of steps, stringer length, and stair angle. Supporting both imperial (inches) and metric (millimeters) units, it’s versatile for global use and accommodates various staircase types, including straight, L-shaped, or outdoor stairs.
Building stairs that are safe, comfortable, and code-compliant? A Stair Calculator is your essential DIY or pro tool for calculating rise, run, tread depth, stringer length, and total materials—complete with diagram, landing, and 3D preview. In 2025, with building codes in Australia (AS 1657), UK (Building Regs Part K), and NZ (NZBC F4) requiring 150-190 mm risers and 240-355 mm treads, calculators on Gcalculate.com deliver instant metric/imperial results for deck stairs, concrete, spiral, stringers, and even carpet or StairMaster calories. Whether you’re a carpenter in Sydney using the MyCarpentry stair calculator, a homeowner in London adding a landing turn, or a fitness buff tracking StairMaster calories, this guide covers every stair calculator type—Australia, UK, NZ, metric, app, EZ, 3D, rise/run, angle, riser, and tread—with diagrams and real examples. Also check out the Roof Replacement Cost Calculator.
A Stair Calculator uses your total floor height, desired step height (rise), tread depth (run), and stair width to compute:
Core Formulas:
Steps:
Pro Tip: Ideal step = 170–180 mm rise + 250–300 mm tread = ~630 mm (2R + G rule).
| Type | Best For | Key Features |
|---|---|---|
| Stair Calculator with Diagram | All users | 2D/3D visual, printable plans |
| Stair Calculator with Landing | Multi-level, L/U-turns | Auto-calculates landing size |
| Stair Calculator Australia | AS 1657 compliance | 150–190 mm rise, 240–355 mm tread |
| Deck Stair Calculator | Outdoor decks | Pressure-treated timber, ground contact |
| Stair Calculator UK | Part K Regs | 150–220 mm rise, 220+ mm tread |
| Stair Calculator Metric | NZ, AUS, EU | mm precision, NZBC F4 |
| Stair Calculator NZ | Residential/commercial | 150–190 mm rise, 280+ mm tread |
| EZ Stair Calculator | Beginners | Simple inputs, instant results |
| MyCarpentry Stair Calculator | Carpenters | Stringer layout, birdsmouth cuts |
| 3D Stair Calculator | Architects | Full 3D model, exportable |
| Concrete Stair Calculator | Permanent builds | Volume, rebar, formwork |
| Spiral Stair Calculator | Space-saving | Center pole, wedge treads |
| Carpet Stair Calculator | Renovations | Carpet length, padding, nosing |
| Stringer Stair Calculator | Framing | Cut list, angle, length |
| Stair Angle Calculator | Safety check | 20°–45° (ideal 30°–37°) |
| Stair Riser / Tread Calculator | Compliance | Code checker (AUS/UK/NZ) |
| Region | Min Riser | Max Riser | Min Tread | Max Angle | Landing |
|---|---|---|---|---|---|
| Australia (AS 1657) | 150 mm | 190 mm | 240 mm | 45° | 1 per 18 risers |
| UK (Part K) | 150 mm | 220 mm | 220 mm | 42° | 1 per 16 risers |
| New Zealand (NZBC F4) | 150 mm | 190 mm | 280 mm | 37° | 1 per 18 risers |
| USA (IRC) | 4″ (102 mm) | 7.75″ (197 mm) | 10″ (254 mm) | 42° | 1 per 12 risers |
Results:
┌──────┐
│ │ ← Tread 280 mm
└──────┘
/ ← Riser 171 mm
/
/______Results:
Results:
A Stair Calculator is your 2025 blueprint for perfect stairs—whether deck, concrete, spiral, or with landing turn. On Gcalculate.com, get diagrams, stringer cuts, and code compliance for Australia, UK, or NZ in seconds. From MyCarpentry layouts to 3D models, EZ simplicity to StairMaster calorie tracking, design safe, beautiful stairs that last.
Try it now: Gcalculate.com/stair-calculator
Enter height (2800 mm), riser (180 mm), and landing on Gcalculate.com → get 2D/3D diagram, stringer length, and cut angles.
AS 1657: 150–190 mm rise, 240–355 mm tread, max 18 risers before landing.
Yes—deck stair calculator adds ground clearance, footing depth, and treated timber specs.
Select “L-Shape” or “U-Turn” → auto-calculates 1000 x 1000 mm landing.
Yes—3D stair calculator lets you rotate, zoom, and export to SketchUp.
30°–37° – Comfortable and safe. Over 42° = ladder.
Input dimensions → get volume (m³), rebar, formwork area.