OBRAS ONSITE · free site calculator

Progress Claim & Retention Calculator

Sanity-check the numbers before the claim goes in: this claim's value, retention withheld against the cap, and GST - live as you type.

Your contract

Contract sum (ex GST)

Claimed & certified to date (ex GST)

Work complete to date - % of contract

Approved variations this claim (ex GST)

Retention rate on each claim

Retention cap - % of contract sum

This claim

Fill the numbers above and the result appears here.

General calculator only - check your contract's retention, cap and payment terms; they win every time. Not financial or legal advice. Security of payment rules differ by state.

Claims paperwork lives in the Obras Onsite builder systems · All free tools →

This is a practical site-management tool. It is not legal, engineering or regulatory advice and does not guarantee compliance or a satisfactory inspection outcome. Requirements may vary by jurisdiction, project, contract and circumstances.

Want a person to look at it?

The tools above are free and yours to use. When you need the paperwork behind them reviewed by someone who has run sites, Obras HSE Services is a live consulting business in south-east Queensland.

SWMS review service — a marked-up review showing what is missing and why it matters.
Construction HSE health check — an independent look at what is in place and what carries exposure.
All Obras HSE Services — scoped and priced before anything starts.