Free tools for tradies
Quick, no-nonsense calculators and generators built for Australian trade businesses. No signup, no catch — just handy gear to get the admin done.
GST Calculator
Add or subtract 10% GST in a flash. Work out GST-inclusive and GST-exclusive amounts for any job.
Use it freeQuote Generator
Build a clean, professional quote and download it as a branded PDF — ready to send to your customer.
Use it freeTax Invoice Generator
Create an ATO-friendly tax invoice with your ABN and GST worked out automatically. Download as PDF.
Use it freeWhat Should I Charge?
Price a job properly — labour, materials, markup and profit — and get a quote that actually makes money.
Use it freeTrue Hourly Rate
Work out what you REALLY need to charge per hour once unbillable time and business costs are counted.
Use it freeOverdue Invoice Chaser
Generate a ready-to-send SMS and email to chase an overdue invoice — friendly, firm or final notice.
Use it freeSick of doing this by hand?
Admin Substitute does your quotes, invoices, follow-ups and chasing overdue payments automatically — so you can stay on the tools.
- Quotes & invoices sent in seconds
- Auto chase overdue invoices
- GST & ABN handled for you
- Built for Aussie tradies
30-day money-back guarantee · No lock-in contracts · 90% cheaper than hiring an admin