How to use the profit calculator
Pick one period, like last month or last year, and take every number from that same period. Mixing a year of sales with a month of rent is the fastest way to get a profit figure that means nothing.
The fields follow the order of an income statement, so you can copy them straight from your books. Leave a field at zero if it doesn't apply. The target and prior-period fields are optional.
- Enter gross revenue for the period and any returns, refunds or allowances.
- Enter the cost of goods sold, or the direct cost of delivering your service.
- Split the rest of your expenses into variable ones (like commissions and card fees) and fixed ones (like rent and salaries).
- Add depreciation, other income, interest and an estimated income tax rate.
- Optional: add an after-tax profit target and last period's revenue and profit.
- Calculate and read the profit layers, margins, break-even revenue and comparison.
Gross profit and net profit formulas
Profit is always revenue minus costs. The question is which costs. The calculator takes them off in a fixed order. Gross profit checks your pricing, operating profit checks day-to-day running, and net profit is the bottom line.
Every margin uses net revenue (after returns) as the bottom of the fraction. Tax is only charged when pre-tax profit is positive. A loss shows as a loss, with no tax refund assumed.
Net revenue = gross revenue - returns and allowancesGross profit = net revenue - cost of goods soldEBITDA = gross profit - variable operating expenses - fixed operating expensesOperating profit = EBITDA - depreciation and amortizationPre-tax profit = operating profit + other income - interestNet profit = pre-tax profit - income taxProfit margin = profit / net revenue x 100
Worked example: $100,000 of sales down to net profit
A business sells $100,000 and refunds $5,000, leaving $95,000 of net revenue. Direct costs are $45,000, so gross profit is $50,000. Variable expenses of $8,000 and fixed expenses of $20,000 bring it to $22,000 before depreciation.
Take off $3,000 of depreciation for $19,000 of operating profit. Add $1,000 of other income, subtract $2,000 of interest, and pre-tax profit is $18,000. At a 20% tax rate that's $3,600 of tax and $14,400 of net profit.
| Line | Calculation | Amount | Margin |
|---|---|---|---|
| Net revenue | $100,000 - $5,000 | $95,000 | |
| Gross profit | $95,000 - $45,000 | $50,000 | 52.63% |
| EBITDA | $50,000 - $8,000 - $20,000 | $22,000 | 23.16% |
| Operating profit | $22,000 - $3,000 | $19,000 | 20.00% |
| Pre-tax profit | $19,000 + $1,000 - $2,000 | $18,000 | 18.95% |
| Net profit | $18,000 - $3,600 tax | $14,400 | 15.16% |
Gross profit vs net profit
Gross profit is what's left after paying for the goods or the direct work. It tells you whether your prices cover the cost of what you sell. In the example it's $50,000, more than half of net revenue.
Net profit is what's left after everything: overheads, depreciation, interest and tax. In the example it's $14,400, less than a third of gross profit. A business can have a strong gross profit and still lose money if overheads are too high, which is why the calculator shows every layer.
Break-even revenue and target profit
To find break-even, the calculator assumes direct and variable costs stay the same share of sales, while fixed costs, depreciation, interest and other income stay put. In the example, each dollar of sales leaves about 44.21 cents after variable costs, and the fixed burden is $24,000. Break-even net revenue is about $54,285.71, so current sales sit $40,714.29 above it.
For a $10,000 after-tax target at 20% tax, you need $12,500 before tax. Add that to the $24,000 fixed burden and divide by 44.21%, and the required net revenue is about $82,559.52.
| Measure | Calculation | Result |
|---|---|---|
| Contribution margin ratio | $42,000 / $95,000 | 44.21% |
| Fixed burden | $20,000 + $3,000 + $2,000 - $1,000 | $24,000 |
| Break-even net revenue | $24,000 / 44.21% | $54,285.71 |
| Margin of safety | $95,000 - $54,285.71 | $40,714.29 |
| Revenue for $10,000 after tax | ($24,000 + $12,500) / 44.21% | $82,559.52 |
What happens if sales rise or fall
The results include a table that moves gross revenue up and down by 10% and 20%. Variable costs move with sales, and fixed costs don't. That's why profit swings harder than revenue.
In the example, a 20% drop in sales cuts net profit from $14,400 to $7,680, nearly half. A 20% rise lifts it to $21,120. If last period's numbers go in the prior fields, you'll also see revenue growth, the change in profit and the margin change in percentage points.
When to double-check the result
Profit isn't cash. Unpaid customer invoices, unsold stock, loan repayments and owner withdrawals all move cash differently from profit. Check your cash flow before deciding what you can spend.
The tax rate is a rough estimate. Real income tax depends on your country, business type, deductions and past losses. For accounts or a tax return, use your bookkeeping records and an accountant.
Sources
These references explain the income statement order, gross profit and break-even analysis used on this page.