Plain-language explanations of the numbers behind selling online, each with a worked example you can check yourself and a free calculator to try your own figures.
Learn the break-even formula for online sellers with a worked example, how to round units up, and what to do when your price can never cover your costs.
October 15, 2026 · 2 min read
Couriers bill the greater of actual and dimensional weight. See the formula, a worked example, why divisors differ, and how to cut the cost of bulky parcels.
October 15, 2026 · 2 min read
A step-by-step method to price an online product: list per-unit costs, account for percentage fees, and use one formula to reach a target profit margin.
October 15, 2026 · 2 min read
Markup and profit margin describe the same profit using different bases. Learn both formulas, a conversion table and a pricing mistake that costs sellers money.
October 15, 2026 · 2 min read
Calculate your e-commerce return rate, estimate what returns cost, and learn why a high rate is a signal to investigate rather than a number to judge alone.
October 15, 2026 · 2 min read
ROAS shows revenue per ad dollar, not profit. Work out your break-even ROAS and see why the same ROAS can be a profit on one product and a loss on another.
October 15, 2026 · 2 min read