TOOLS · 13 CALCULATORS

Tools

Working instruments we built for ourselves and left open. Free, no sign-up, and nothing you type is sent anywhere.

Calculator

Thirteen calculators for Indian practice, from land units and carpet area to construction cost, paint, tiles, AC tonnage, GST with TDS and the Council of Architecture fee scale. Nothing you type leaves your browser.

Calculate

Standard and scientific
Unit converter

Land and area

Land units
Carpet and built-up
FSI and FAR

Build and interiors

Construction cost
Paint
Tiles and flooring
Interior finishes
Kitchen and wardrobe
AC tonnage

Money

GST and TDS
Architect’s fee

Open the calculator

Who built these

256 GRAYS is an interior architecture and 3D visualisation studio in Mumbai, practising since 1999. We build these tools because we need them ourselves: the same conversions, quantities and fee arithmetic come up on every project, and a calculator that already knows what a guntha is beats a spreadsheet. They are free to use and free to share.

See the studio's work Start a project