Comparisons
Two metrics that look alike and get confused all the time. Each comparison shows the difference, a worked example, and which one to reach for — plus the calculator to check it.
Margin vs Markup: What's the Difference?
Margin and markup both measure profit, but from different bases. See the difference, the formulas, and a worked example — then check either with the free calculator.
ROI vs ROASROI vs ROAS: What's the Difference?
ROI and ROAS both measure returns, but ROAS ignores your other costs. Learn when each is the right metric — and use the free calculator that reports both at once.
Hourly vs Fixed priceHourly vs Fixed Price: Which Should You Charge?
Charging by the hour or quoting a fixed price changes who carries the risk and how much you earn. Compare both models, with the calculators to price each one.
GST vs VATGST vs VAT: What's the Difference?
GST and VAT are both taxes on the value added to a sale. See how they differ, where each applies, and how to add or remove either from a price with Plainso.