Why 7:20 is not 7.20 hours
Twenty minutes is one third of an hour. Dividing 440 minutes by 60 gives 7.333333 hours. The calculator keeps the minute count for the amount calculation rather than treating the digits after the colon as hundredths. At A$100 per hour, the minute-based amount is A$733.33. A quantity of 7.33 at the same rate produces A$733.00: a 33-cent difference.
Choose the agreed billing basis
Start with the duration and rate you have agreed with the customer. This checker does not round time up to six-minute or fifteen-minute blocks. If your terms use a minimum charge or a different rounding rule, apply that agreement separately. The six-decimal display is a reference; check how many decimals your destination invoice accepts before copying a quantity.
Move the checked amount into the invoice
Use a clear service description and service period. If you need to preserve the minute-based amount, review whether an agreed fixed line amount is a more accurate presentation than a shortened decimal quantity. Check the invoice preview and subtotal before exporting. This calculation is before any separate GST treatment and does not determine a tax rate.
Keep a review record
Run the check again whenever an input changes. Invalid or incomplete input clears the previous live result and disables download, so an old answer is not presented as current. Downloads contain the check table only; they are not a tax invoice, payment receipt or successful invoice export. They do not update drafts, history, login or payment status.
Microsoft: calculating time differences · Reference for the underlying recordkeeping or calculation concept; not an endorsement of this helper.