Guides

Every guide states its formula, works one example through end to end, and lists what it leaves out. Where a free calculator does the same arithmetic, it is linked from the guide.

• Airbnb & Short-Term Rentals

  How to calculate Airbnb profit

  Revenue is the easy half. Profit needs the platform's cut, the turnover costs that scale with bookings, and the fixed costs that arrive whether or not anyone stays.

• Construction

  How to price a construction job

  Build the cost up in the order it is actually incurred, then add markup — and know that the markup you added is not the margin you earned.

• Real Estate & Landlords

  How to calculate rental property ROI

  Cap rate and cash-on-cash return answer different questions, and a property can look strong on one while losing money every month on the other.

• Small Business

  Markup vs margin: why they are not the same number

  Adding 30% to cost does not earn a 30% margin. It earns 23%. The gap is small on paper and large across a year.

• Small Business

  How to calculate your break-even point

  Break-even is not about covering costs with revenue. It is about how much of each sale is left after the costs that grow with it.