Convert percentage margin into percentage markup without knowing the revenue. So client has asked me to add an option to their website where they can apply **margin markup** instead of **regular markup**. But all the formulas that I seem to be reading seem to know the revenue value in order to calculate the margin. But I don't know the revenue. < This calculator in the link above does not know the revenue, and simply calculates the revenue. For example £1 Margin: 30% Revenue: £1.43 So I need to know the formula that makes this 43% regular markup. To arrive at a 10% margin, the markup percentage is 11.1% To arrive at a 20% margin, the markup percentage is 25.0% To arrive at a 30% margin, the markup percentage is 42.9% To arrive at a 40% margin, the markup percentage is 80.0% To arrive at a 50% margin, the markup percentage is 100.0% Can this be made into a formula somehow?

$$ \frac{1}{1- p_{\text{margin}}} = 1 + p_{\text{markup}} $$ where $p_{\text{margin}}$ is the margin divided by $100~\%$; and $p_{\text{markup}}$ is the markup divided by $100~\%$.