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Invoice Unit Price Calculator

Work out the unit price from a total, a margin, a markup or a landed cost.

Invoice Tools Reviews Free · no sign-up

Quick Tool Overview

The Invoice Unit Price Calculator derives a unit price from a total, a cost plus margin, a cost plus markup or a landed cost — and compares price per unit across pack sizes, which is the calculation a buyer does before they negotiate.

What it does
Works out the price per unit
You give it
A total and quantity, or a cost and a target
You get back
The unit price, with margin and markup both shown
Best for
Pricing, and checking a supplier’s pack deal
Invoice Tools Free, unlimited use No sign-up Runs in your browser

About the Invoice Unit Price Calculator

The unit price is the number everything else on an invoice is built from, and it is usually derived rather than decided. From a total and a quantity. From a cost and a target margin. From a landed cost that already includes freight and duty. From a competitor’s shelf price working backwards.

This does all four. Enter a total and a quantity and it divides. Enter a cost and a margin and it works out the price properly — cost divided by one minus the margin, not cost plus the margin, which is the error that quietly costs a business its profit. Enter a markup and it does that instead, and shows what margin the markup actually produces.

It also compares unit prices across pack sizes, which is the calculation a buyer does before they negotiate: a case of 24 at £76.80 is £3.20 a unit, and a case of 12 at £40 is £3.33, so the smaller case is 4% dearer however it was presented.

Key features of the Invoice Unit Price Calculator

Margin done properly

Cost divided by one minus the margin, not cost plus it.

Markup shown too

So the two are never confused in the same conversation.

From a landed cost

Freight and duty included, which is what the goods really cost.

Pack size comparison

Price per unit across case quantities, side by side.

Rounding checked

A penny across 5,000 units is £50 off the total.

How to use the Invoice Unit Price Calculator

  1. 1

    Pick what you know

    A total and a quantity, or a cost and a target margin or markup.

  2. 2

    Enter the figures

    Including freight and duty if you are working from a landed cost.

  3. 3

    Read the unit price

    With the margin and markup both shown, because they are not the same thing.

  4. 4

    Compare pack sizes

    Price per unit across different case quantities, side by side.

  5. 5

    Check the rounding

    A price rounded to the nearest penny across 5,000 units moves the total.

Frequently asked questions

Divide the cost by one minus the margin. For a 40% margin on a £60 cost, £60 ÷ 0.6 = £100. Adding 40% to the cost gives £84, which is only a 29% margin.

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