Clear numbers for the next decision.

Every tool shows its formula, example, edge cases, and limitations.

Calculate gross profit, margin, markup, and a target price from revenue and direct cost.

Turn a cost and markup percentage into a selling price, profit dollars, and resulting margin.

Find units and revenue needed to cover fixed costs from price and variable cost.

Set a price from cost, fixed-cost allocation, target margin, and payment fees shown separately.

Create a simple browser-only invoice total with line discount and tax, ready to print locally.

Calculate gain, return on investment, and a simple annualized rate from returned value, investment, and months.

Track opening cash, period changes, net movement, and closing balance in a clear table.