Business calculators here focus on what is left after costs: the fee a marketplace or payment processor takes, the margin on a product once shipping and returns are counted, and the hourly rate a freelancer needs to hit a target income. They suit sellers, contractors and creators pricing work honestly rather than hopefully.
15 calculators in this category
Markup measures profit against cost; margin measures the same profit against the selling price. A product costing 40 and selling for 60 carries a 50% markup but only a 33% margin. Confusing the two is the classic way a business quietly underprices itself, because a target 'ffty percent' set as markup produces a third less profit than the same figure read as margin.
Whichever you use, cost must include everything variable: the item, inbound shipping, packaging, outbound postage, payment fees and an allowance for returns and damaged stock.
Marketplace and processing fees are usually a percentage plus a fixed amount per transaction. The fixed component hurts small orders disproportionately — a flat 30 cents is negligible on a 90 sale and severe on a 3 one — which is why low-value items often need bundling to survive. Fulfilment programs add storage, pick-and-pack and long-term storage surcharges that scale with size and weight bands rather than with price, so bulky low-price items are the hardest to make work.
A freelance rate is not a salary divided by 2,080 hours. Start from the income you need, add self-employment tax, health cover, pension, software and equipment, then divide by billable hours only — realistically 55 to 70% of a working year once admin, sales and unpaid holiday are removed. The resulting number is usually well above the equivalent employed wage, and that difference is the cost of the benefits an employer would otherwise provide.
Fee and margin calculators work in pre-tax terms unless a tax field is shown. Income tax and self-employment contributions depend on your jurisdiction and total earnings, so run the result through an income tax or paycheck calculator for a take-home figure.
Platforms revise their fee schedules regularly and rates often vary by product category and seller plan. We flag figures we cannot confirm against a current published schedule with a VERIFY note — check the platform's own fee page before setting prices.
It depends on the model. Resellers with high stock turnover often work on 15 to 25% net, while makers and digital products can hold much more. The useful test is whether the margin covers fixed overhead at your realistic sales volume, not whether it beats a benchmark.
Yes, if you want a number that reflects reality. Divide total advertising spend by units sold in the same period to get a cost per acquisition and add it to the unit cost — many products look profitable until that line is included.