The numbers every small business owner needs to know, explained plainly: profit margin, break-even, contractor cost, and debt. Each section links to the calculator that does the arithmetic.
Running a small business means making financial decisions constantly, usually with incomplete information and a full inbox. This guide covers the core numbers: what to charge, when you break even, what a contractor actually costs, and how to think about debt. Each section links to the calculator that does the arithmetic.
Profit margin is the share of revenue left after costs. It is the clearest signal of pricing health. Confusing markup with margin is a common and expensive error: a 50% markup is only a 33% margin. The Profit Margin Calculator converts between cost, price, and margin so you price on purpose rather than by instinct.
The break-even point is the volume at which revenue covers both fixed and variable costs. Below that number, every sale loses money on the period. Above it, each additional unit contributes to profit. The Break-Even Calculator produces the number from your fixed costs, price, and variable cost per unit. Most business owners know the formula and still find the actual result surprising.
A contractor's hourly rate is not the full cost to the client or the full income to them. On the client side, there are no employer taxes or benefits to pay, which makes contractors appear cheaper than employees. On the contractor side, the self-employment tax alone adds 15.3% before income tax. The Independent Contractor Calculator translates between the two so neither party is working from a wrong number.
Many owners carry both business and personal debt, including student loans that predate the business by years. The Student Loan Calculator projects payoff timelines and total interest so you can weigh an extra payment against reinvesting the same money. High-interest debt is almost always worth paying down first. Low-rate debt can reasonably coexist with growth, though the math on that depends entirely on what the investment returns.
The numbers shift whenever costs, prices, or volume change. Revisit margins when a supplier raises prices. Recompute break-even before changing what you charge. Budget the full loaded cost before adding a hire. None of these calculations are complicated. The discipline is running them before the decision rather than after.
Markup is profit as a percentage of cost. Margin is profit as a percentage of selling price. A 50% markup equals a 33% margin. They describe the same profit from different angles, which is why mixing them up costs money.
The sales volume at which revenue exactly covers all fixed and variable costs. Below it, the business loses money on the period. Above it, each additional unit contributes profit equal to the contribution margin.
A contractor's hourly rate must cover self-employment taxes (15.3%), health insurance, and any other benefits an employer would otherwise provide. The rate that looks high is often the one that actually keeps the contractor solvent.
Pay down high-interest debt first. The math is straightforward: guaranteed interest savings beat uncertain investment returns. Low-rate debt can reasonably stay in place while you reinvest, but only if the business returns more than the interest rate on that debt.
No. These are general calculations for planning purposes, not tax, legal, or financial advice. Your numbers and situation will differ.
