Business & Work Calculators
Check invoices, pay, and hours — GST add/remove, hourly rates, overtime pay, and shift totals.
- Calculators
- 6
- Cost
- Free
- Sign-up
- None
Business calculators
GST Calculator
Add GST to a base price or remove it from an inclusive total, with 5%, 12%, 18%, 28%, or a custom rate.
Work Hours Calculator
Add your start time, end time, and break minutes to get total hours worked — including overnight shifts.
Overtime Calculator
Enter your hourly rate, hours worked, and multiplier to see regular pay, overtime pay, and the total.
Salary Per Hour Calculator
Find your effective hourly rate from a monthly salary and the hours you actually work.
Hourly to Salary Calculator
Convert an hourly rate into daily, weekly, monthly, and annual pay to compare contract and salaried roles.
Working Days Calculator
Count working days between two dates, excluding weekends and the public holidays you specify.
About these business calculators
Small errors in tax, time, or pay calculations add up quickly across invoices and pay periods. These business calculators give fast, transparent checks for the numbers freelancers, shop owners, managers, and employees work with every week.
Use them to verify a payslip, price an invoice with or without GST, total a timesheet, or compare an hourly contract with a salaried offer. Each page lists what the tool does not cover, such as local labour rules or input tax credit.
Tips for accurate results
- Know if a price is inclusive. Adding GST to an amount that already includes it double-counts the tax. Use “Remove GST” for inclusive prices.
- Deduct only unpaid breaks. Paid rest breaks count as worked time. Subtracting them under-reports hours and pay.
- Check your overtime threshold. Overtime starts after 40 hours in many places, but contracts may use 37.5, 45, or daily limits.
FAQ
Business calculator questions
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