Business topic
Grow a Business calculators
Price for margin, find the break-even point, and value customers so growth decisions are grounded in unit economics.
Reviewed by BoringToolsKit · August 24, 2026 · Planning information, not professional advice.
Grow a Business: the big picture
Growing a business is unit economics: what each sale contributes after costs, how many sales cover the fixed costs, and what a customer is worth over time. Once you know margin, break-even, and customer lifetime value, growth channels — ads, commissions, marketplaces — become math instead of guesses. BoringToolsKit's business tools compute the margin, the break-even units, the lifetime value, and the ad budget that still leaves a profit.
- Margin is what a sale contributes after variable costs.
- Break-even is fixed costs divided by contribution per unit.
- Customer lifetime value tells you what you can afford to spend to acquire one.
- Price for the margin you need after costs.
- Find how many units cover fixed costs (break-even).
- Compare customer lifetime value against acquisition and ad costs.
Worked example: a $40 product with $18 cost
- Step 1: Profit Margin and Markup Calculator — Enter $40 price and $18 cost See: 55% margin — $22 contribution per sale
- Step 2: Break-Even Units Calculator — Enter $12,000 monthly fixed costs with $22 contribution See: 546 units a month to break even
- Step 3: Customer Lifetime Value Calculator — 3 orders a year × 4 years at $22 contribution See: About $264 lifetime value — your ceiling for acquisition spend
Numbers depend on the inputs you enter; the walkthrough shows one realistic scenario.