Business Invoice Generator
A company invoice with registration numbers, PO references and bank details.
Invoice Quantity Calculator
Convert between cases, units, hours and fractions, and check what a quantity should be.
Quick Tool Overview
The Invoice Quantity Calculator converts between the units invoices actually use — cases and units, minutes and billable hours, thousands for print — applies minimum billing increments, and works backwards from a fixed budget.
- What it does
- Converts and checks invoice quantities
- You give it
- A quantity, a conversion and an increment
- You get back
- The billable quantity and what it comes to
- Best for
- Avoiding an invoice wrong by a factor
About the Invoice Quantity Calculator
Most quantity errors on an invoice come from a unit mismatch. A wholesale order agreed in cases invoiced in units. Time tracked in minutes billed in hours. A price agreed per thousand charged per hundred. Each of them produces an invoice that is out by a factor rather than a rounding error, and a factor is the kind of mistake that ends a supplier relationship.
This converts between the units invoices actually use — cases and units, dozens, pallets and layers, minutes and billable hours, thousands for print and words for copy — and shows the line total each produces, so a mismatch is obvious rather than subtle.
It also answers the reverse question, which is the one clients ask: given a budget and a unit price, how much can they have? And it handles minimum billing increments, because a six-minute call billed in fifteen-minute units is a quarter of an hour, and pretending otherwise is how time gets given away.
Key features of the Invoice Quantity Calculator
Cases, units and pallets
The mismatch that produces an invoice out by a factor.
Minutes to billable hours
With the minimum increment your terms actually state.
Per thousand and per word
The units print and copywriting price in.
Backwards from a budget
How much a fixed budget buys at that unit price.
Line total shown
So a wrong unit is obvious rather than subtle.
How to use the Invoice Quantity Calculator
-
1
Enter what you have
Cases, minutes, pieces — whatever the real quantity is.
-
2
Say how it converts
Units per case, minutes per billable unit, pieces per thousand.
-
3
Set the minimum increment
Six-minute units, quarter hours, half days — whatever your terms say.
-
4
Read the billable quantity
And the line total it produces at your unit price.
-
5
Or work back from a budget
How much a fixed budget buys at that price.
Frequently asked questions
In whatever the price was agreed in, with the other shown in the description. A retailer needs the case price to pay you and the unit cost to set their own margin, so showing both is worth the extra column.
To the increment your terms state — six-minute units in law, quarter hours in many trades, half days for site work. Rounding to a larger increment than you agreed is the commonest source of billing complaints.
Yes for time and measure. For goods it depends on how they are sold — half a case is usually not a thing, and invoicing one invites a query about what was actually shipped.
The smallest unit of time you charge for, regardless of how little was used. A six-minute call under a fifteen-minute minimum is billed as fifteen. It must be agreed in advance to be chargeable.
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