Business Calculators

These are the calculations a small business runs weekly: what to charge, what a sale actually earns, how many units cover the fixed costs, what the tax component is, and whether the money going into advertising is coming back. Each one is on its own page with the formula shown, so you can see what it did rather than trusting a number.

Pricing and profit

The single most expensive arithmetic mistake in small business is confusing markup with margin. A 50% markup on a cost of 100 gives a price of 150 and a margin of 33.3%, not 50%. The markup calculator and the profit margin calculator convert between the two and show both figures at once so the mistake cannot survive. The break-even calculator then tells you how many units that price has to move before the fixed costs are covered.

Tax, payroll and invoices

The VAT calculator adds or removes tax at any rate, which matters because removing 20% is not the same as taking 20% off. The GST calculator does the same for GST rates and splits it into CGST and SGST where that applies. For people, the overtime calculator, commission calculator and hourly to salary converter cover the usual payroll arithmetic, as gross figures: deductions depend on your country and are not guessed at here.

Advertising metrics

CPM, CPC, CPA, conversion rate, ROAS and customer lifetime value are all one division each, and all of them get reported wrongly often enough to be worth a page apiece. The ROAS calculator and customer lifetime value calculator are the two worth running before deciding a campaign works: a good ROAS on a product nobody buys twice is a different business from a modest one on a product people buy for years.