Choose the right calculator
Comparing markup with margin
Both start with profit, but margin divides by selling price while markup divides by cost. They are not interchangeable percentages.
Covering a fixed cost
Find the whole sales units required when every sale contributes a positive amount toward fixed costs.
Setting a billable-rate baseline
Use hours you can invoice, not every hour you work. Include annual business costs alongside your pay target.
Exploring website revenue scenarios
Pair page views with page RPM. Use your own observed RPM or label it as an assumption; the example is not a forecast.
Put the numbers to work
Keep all currency amounts on one consistent basis and all period inputs aligned. These arithmetic models omit any cost, tax, or fee that you do not enter.