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Construction cost planning with calculators and reports
Free Tools

Free tools for builders, contractors & architects

Calculators and generators we built for the Indian construction industry — GST bills, cost estimates, concrete quantities and more. Free forever, no sign-up, nothing uploaded.

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Everyday site & office utilities

Each tool works instantly in your browser — on site, in the office, or on your phone.

Why we give these away

We build ARC PEM — offline desktop software that Indian construction and architecture firms use to track BOQs, vendor bills, labour and GST. These free tools solve the small, everyday versions of the same problems: raising a clean contractor bill, sanity-checking a construction budget, ordering the right number of cement bags. Use them as much as you like; if the bigger problem of tracking an entire project's expenses sounds familiar, that's what the full product is for.

Frequently asked questions

Are these construction tools really free?
Yes — every tool on this page is free with no sign-up, no usage limits and no watermarks. They are built and maintained by HashX Labs, the team behind ARC PEM project expense management software.
Do the tools upload my data anywhere?
No. All calculators and the bill generator run entirely in your browser. Details you type (like your firm name in the bill generator) are stored only on your own device.
Do they work on mobile?
Yes — every tool is responsive and works on any phone, tablet or computer with a modern browser. No app installation needed.

This tool is free forever. The full app goes much further.

ARC PEM tracks your BOQ, vendor bills, labour attendance, contractor ledgers and GST across every project — fully offline, on your own computer.

Explore ARC PEM →
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