ROI, Break-Even, and Commercial Maths Workbook
A stronger workbook-style pack for ROI, break-even thinking, contribution per unit, and practical commercial comparisons where volume and return both matter.
A clearer pricing sheet for markup, margin, discounting, and price logic, built to stop common denominator mistakes before they distort commercial decisions.
Keep this sheet nearby when moving between cost, selling price, markup, margin, and discount scenarios so the percentages do not get mixed.
They share the same profit difference but use different denominators. That is why the percentages are not interchangeable.
An item cost, a target margin, and a promotional discount can be chained through the formulas to show how apparently small pricing changes alter the profit retained per unit.
Work out gross profit, profit margin, and markup from the selling price and cost you enter.
Use the Markup Calculator to work out markup from values you control yourself, without baked-in policy assumptions.
Use the Discount Calculator to work out discount from values you control yourself, without baked-in policy assumptions.
Use the Break-Even Units Calculator to work out break-even units from values you control yourself, without baked-in policy assumptions.