Net Profit Margin Calculator: Net Income vs Revenue

Is a 15.00% net profit margin healthy?

On the defaults — $180,000.00 of net income and $1,200,000.00 of revenue — the net profit margin is 15.00%. Net profit margin is the share of each dollar of sales a business keeps as profit after every expense — cost of goods sold, wages and rent, interest on loans, and tax. Typical margins vary widely by industry: grocery and general retail often 1–5%, restaurants 3–9%, professional services 10–20%, software and SaaS 15–25% or more, because software costs little to reproduce. A 15.00% margin sits at the top of the professional-services band and at the bottom of the software band — ordinary for a service business, modest for a software one. A low margin is not always bad — a supermarket earns a few cents per dollar but sells a huge volume, while a luxury brand earns a lot per sale but sells few.

Three things about the model are worth stating plainly. First, the net profit margin is the net income divided by the revenue, times 100 — $180,000.00 ÷ $1,200,000.00 × 100 = 15.00%. Second, the net income needed for a 20.00% margin is $240,000.00. And third, the revenue needed for a 20.00% margin is $900,000.00; all listed in Accuracy & limitations.

The worked example, line by line

Setup: $180,000.00 of net income, $1,200,000.00 of revenue, target margin 20.00%.

Line 1 — the net profit margin. The net profit margin is $180,000.00 ÷ $1,200,000.00 × 100 = 15.00%.

Line 2 — the net income the target needs. The net income needed for a 20.00% margin is 20.00 ÷ 100 × $1,200,000.00 = $240,000.00.

Line 3 — the revenue the target needs. The revenue needed for a 20.00% margin is $180,000.00 ÷ (20.00 ÷ 100) = $900,000.00.

Line 4 — the check. $180,000.00 ÷ $1,200,000.00 × 100 = 15.00%, the net profit margin; and 15.00% of every dollar is 15 cents, the profit kept per dollar of sales.

Every branch, checked

Revenue $1,500,000: Net profit margin 12.00% — With revenue of $1,500,000.00 the net profit margin falls to 12.00% — the same profit spread over more sales.

Net income $240,000: Net profit margin 20.00% — With net income of $240,000.00 the net profit margin rises to 20.00% — the target, met exactly.

Revenue $900,000: Net profit margin 20.00% — With revenue of $900,000.00 the net profit margin rises to 20.00% — the same profit on fewer sales.

Net income $120,000: Net profit margin 10.00% — With net income of $120,000.00 the net profit margin falls to 10.00% — a third less profit kept.

Net income $0: Net profit margin 0.00% — With no net income the net profit margin is 0.00% — the business breaks even, keeping nothing.

Revenue $2,400,000: Net profit margin 7.50% — With revenue of $2,400,000.00 the net profit margin falls to 7.50% — the same profit spread over twice the sales.

What-if bars — revenue halved, net income doubled, revenue doubled: revenue halved to $600,000: net profit margin 30.00%; net income doubled to $360,000: net profit margin 30.00%; revenue doubled to $2,400,000: net profit margin 7.50% — Halving the revenue or doubling the net income both lift the margin to 30.00%; doubling the revenue halves it to 7.50%.

The reverses, worked backwards

Smallest whole-dollar net income for the margin to reach 18.00%: At the displayed $216,000 the figures are Net profit margin 18.00%; net income needed for the 18.00% target $216,000.00; revenue needed for the 18.00% target $1,200,000.00. At the displayed $216,000 the margin is 18.00% (exactly 18.00). At $215,999 the income is $1 short of the $216,000 needed — and the unrounded margin is 17.999917%, which displays as 18.00% after rounding, so $216,000 is the smallest whole-dollar net income for the margin to reach 18.00%.

Smallest whole-dollar net income for the margin to reach 25.00%: At the displayed $300,000 the figures are Net profit margin 25.00%; net income needed for the 25.00% target $300,000.00; revenue needed for the 25.00% target $1,200,000.00. At the displayed $300,000 the margin is 25.00% (exactly 25.00). At $299,999 the income is $1 short of the $300,000 needed — and the unrounded margin is 24.999917%, which displays as 25.00% after rounding, so $300,000 is the smallest whole-dollar net income for the margin to reach 25.00%.

Largest whole-dollar net income for the margin to STAY at or below 12.00%: At the displayed $144,000 the figures are Net profit margin 12.00%; net income needed for the 12.00% target $144,000.00; revenue needed for the 12.00% target $1,200,000.00. At the displayed $144,000 the margin is 12.00% (exactly 12.00). At $144,001 the income is $1 over the $144,000 allowed — and the unrounded margin is 12.000083%, which displays as 12.00% after rounding, so $144,000 is the largest whole-dollar net income for the margin to stay at or below 12.00%.

Smallest whole-dollar revenue for the margin to fall to 10.00% or below: At the displayed $1,800,000 the figures are Net profit margin 10.00%; net income needed for the 10.00% target $180,000.00; revenue needed for the 10.00% target $1,800,000.00. At the displayed $1,800,000 the margin is 10.00% (exactly 10.00). At $1,799,999 the revenue is $1 under the $1,800,000 needed — and the unrounded margin is 10.000006%, which displays as 10.00% after rounding, so $1,800,000 is the smallest whole-dollar revenue for the margin to fall to 10.00% or below.

Largest whole-dollar revenue for the margin to STAY at or above 20.00%: At the displayed $900,000 the figures are Net profit margin 20.00%; net income needed for the 20.00% target $180,000.00; revenue needed for the 20.00% target $900,000.00. At the displayed $900,000 the margin is 20.00% (exactly 20.00). At $900,001 the revenue is $1 over the $900,000 allowed — and the unrounded margin is 19.999978%, which displays as 20.00% after rounding, so $900,000 is the largest whole-dollar revenue for the margin to stay at or above 20.00%.

Smallest whole-dollar net income for the margin to reach 30.00%: At the displayed $360,000 the figures are Net profit margin 30.00%; net income needed for the 30.00% target $360,000.00; revenue needed for the 30.00% target $1,200,000.00. At the displayed $360,000 the margin is 30.00% (exactly 30.00). At $359,999 the income is $1 short of the $360,000 needed — and the unrounded margin is 29.999917%, which displays as 30.00% after rounding, so $360,000 is the smallest whole-dollar net income for the margin to reach 30.00%.

A warning about the neighbours: every neighbour above shows as the target when rounded to two decimals, but its unrounded margin is a hair above or below the target. A lender underwriting on the unrounded margin would still say no where the unrounded figure misses the line. The page prints the unrounded neighbour value in full so the rounding does not mislead you: 17.999917, 24.999917, 12.000083, 10.000006, 19.999978 and 29.999917.

What the defaults assume

The defaults are $180,000.00 of net income, $1,200,000.00 of revenue and a target margin of 20.00% — Net profit margin 15.00%; net income needed for the 20.00% target $240,000.00; revenue needed for the 20.00% target $900,000.00. With Revenue $1,500,000, Net profit margin 12.00%. With Net income $240,000, Net profit margin 20.00%. With Revenue $900,000, Net profit margin 20.00%. With Net income $120,000, Net profit margin 10.00%. With Net income $0, Net profit margin 0.00%. With Revenue $2,400,000, Net profit margin 7.50%. With What-if bars — revenue halved, net income doubled, revenue doubled, revenue halved to $600,000: net profit margin 30.00%; net income doubled to $360,000: net profit margin 30.00%; revenue doubled to $2,400,000: net profit margin 7.50%. With Net income $0, Net profit margin 0.00%. With Revenue $0, Net profit margin — (undefined: no revenue to divide by). With Net income $215,999, Net profit margin 18.00%. With Net income $100,000, revenue $750,000, Net profit margin 13.33%. With Net income $333,333, revenue $1,000,000, Net profit margin 33.33%. With Net income $144,001, Net profit margin 12.00%. With Margin bars, net income $60,000: net profit margin 5.00%; net income $600,000: net profit margin 50.00%; revenue $600,000: net profit margin 30.00%; revenue $3,600,000: net profit margin 5.00%.

A note on the rounding: with net income of $215,999 the unrounded margin is 17.999917%, which rounds half-up to 18.00% — but it is still below the 18% line. With net income of $144,001 the unrounded margin is 12.000083%, which rounds half-up to 12.00% — but it is just above the 12% line. With net income of $100,000 and revenue of $750,000 the unrounded margin is 13.333333%, which rounds to 13.33%. With net income of $333,333 and revenue of $1,000,000 the unrounded margin is 33.333300%, which rounds to 33.33%. The page prints the unrounded values so the rounding does not mislead you.

Output · formula · meaning

Who uses this

• The small-business owner checking the year: they learn $180,000.00 of net income on $1,200,000.00 of revenue gives a 15.00% margin — and they check the $216,000 reverse to see the smallest income for an 18.00% margin.
• The retailer whose shelves are full: they learn doubling the revenue halves the margin to 7.50% — and they check the $144,000 reverse to see the largest income that stays at or below a 12.00% margin.
• The consultant pricing a job: they learn a 20.00% margin needs $240,000.00 of net income on the same revenue — and they check the $1,800,000 reverse to see the smallest revenue that pulls the margin to 10.00% or below.
• The SaaS founder running lean: they learn a 15.00% margin sits at the bottom of the software band — and they check the $900,000 reverse to see the largest revenue that keeps the margin at or above 20.00%.

Accuracy & limitations

The math is first-principles: the net profit margin is the net income divided by the revenue, times 100; the net income needed at the target is target margin ÷ 100 × revenue; the revenue needed at the target is net income ÷ (target margin ÷ 100) — all rounded to two decimals half-up. The reverses are judged on the UNROUNDED margin: a neighbour one dollar short or over shows as the target when rounded to two decimals, but its unrounded margin is above or below the target, so it does not meet the bar — the page prints the unrounded neighbour value in full. What the model cannot do is judge the business: use NET income, never gross profit, because gross profit ignores operating expenses, interest and tax, so gross margin is always higher than net margin for the same business; margin is not markup — markup is profit over cost, margin is profit over revenue, so a 25% markup on cost is only a 20% margin on revenue; with revenue of $0 the margin is undefined — the calculator shows “—” with a note, never Infinity or NaN; a negative margin means the business loses money on every dollar of sales; and the same margin means different things by industry, so compare within an industry, not across them. A low margin is not always bad — a supermarket earns a few cents per dollar but sells a huge volume, while a luxury brand earns a lot per sale but sells few. Use it to see what you keep from each dollar of sales — then read the rest of the statements.

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