Profit margin calculator for a business run on rupees
Most small businesses know their sales figure and very little else. Enter revenue, what the work or the goods cost you, and your running overheads — this calculator shows what is actually left, as an amount and as a margin you can compare month to month.
Work out your margin
Use one period consistently — a month, a quarter, or a year. If your sales figure comes off a billing report and includes GST, tick the box and pick the rate so the margin is measured on money that is genuinely yours.
- Revenue as entered
- ₹5,00,000
- Net revenue
- ₹5,00,000
- Gross profit
- ₹2,25,000
- Gross margin
- 45%
- Total costs
- ₹4,00,000
- Net margin
- 20%
Planning view of your own figures. Direct costs here mean what the job or the goods cost you to deliver; other costs are the running overheads. A margin built on costs you are not actually recording looks authoritative and is not, so exclude anything you cannot evidence rather than guessing a number for it.
How this is calculated
Gross profit = Net revenue − Direct costs
Gross margin % = Gross profit ÷ Net revenue × 100
Net profit = Net revenue − Direct costs − Other costs
Net margin % = Net profit ÷ Net revenue × 100
If revenue includes GST: Net revenue = Revenue ÷ (1 + Rate ÷ 100)Both margins use net revenue as the denominator, not the total that reached the customer. GST is collected on behalf of the government and is not revenue, so leaving it in the denominator quietly deflates every margin percentage you report.
Worked example
Take an agency month with ₹5,00,000 of revenue, ₹2,75,000 of direct delivery cost, and ₹1,25,000 of other costs such as rent, salaries, and software. Gross profit is ₹2,25,000 — a 45% gross margin. After the ₹1,25,000 of overheads, net profit is ₹1,00,000, which is a 20% net margin. That 25-point gap between the two margins is the overheads, and it is the number worth watching.
Now suppose the same month was read from a counter report showing ₹5,90,000, which includes 18% GST. Net revenue is ₹5,90,000 ÷ 1.18 = ₹5,00,000, with ₹90,000 of GST inside it. The margin is identical to the first example. Had you measured on ₹5,90,000, the same healthy month would have read as a 16.9% net margin instead of 20%.
Making the numbers honest
A margin is only as trustworthy as the costs underneath it. The common failure in a small business is not bad arithmetic — it is costs that were never recorded because nobody had anywhere to put them. Contractor fees, a designer's hours, a courier bill, a phone recharge, and the founder's own evenings all belong in the cost side if you want the margin to mean anything.
Run the calculator twice. First with only the costs you can evidence from invoices, then again with an honest estimate for the ones you know exist but have never written down. The gap between the two is your blind spot, and it is usually larger than people expect. Keep the conservative figure as the one you report and treat the difference as work to close.
The other discipline is consistency. Measure the same thing, the same way, every month. Changing what counts as revenue between periods makes two reports incomparable, which means the trend line you built them to see is fiction.
Related tools
- Markup vs Margin Calculator — turn a cost into a price and see the two percentages side by side.
- Project Profitability Calculator — run the same arithmetic on a single job.
- Reverse GST Calculator — strip GST out of a sales figure before you measure it.
- Reports & Economics — quoted, billed, collected, and outstanding read as four separate facts.
- Retail Day-End Reconciliation Calculator — check that the counter total matches the money.
- All free tools for small business operations.
Want this margin from records instead of a spreadsheet?
NoxOrigin reports quoted, billed, collected, and outstanding value as four separate facts, per client and per project, with a path back to the records behind each number. Project economics compare what a project was worth against what was delivered, so a badly scoped job becomes a pattern you can see rather than one unpleasant recollection.
That is a commercial view of your own work, not a cost accounting system — how much of your cost base is genuinely recorded decides how meaningful the margin is.