Welcome to Jarrah

Free tools for builders and architects.

Stair Planner

Calculate the dimensions of a staircase based on space available, preferred riser / going size, and Australian standards.

Use Stair Planner

Even Spacing

Evenly space items across a given distance by a preferred spacing. Optionally include item thickness, and choose start, center or end markings.

Use Even Spacing

Running Measurement

Calculate a continuous measurement. Add and remove modifiers to adjust for obstacles.

Use Running Measurement

Check Square

Check if a room, frame or object is square.

Use Check Square

© 2025 Jarrah

Made by S.J. Smith