Break a period's results into the standard P&L waterfall — gross profit, operating profit, profit before tax and net profit — with the corresponding margins.
Données vérifiées · July 2026
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This calculator walks a period's revenue down through the standard profit and loss waterfall: cost of sales removed gives gross profit, operating expenses and other income adjust that to operating profit, finance costs bring you to profit before tax, and tax gets you to net profit — each expressed both in pounds and as a margin on revenue, so you can see exactly where profitability is being eroded.
£500,000 revenue, £300,000 cost of sales, £100,000 operating expenses, £10,000 finance costs and £15,000 tax: £200,000 gross profit (40% margin) and roughly £75,000 net profit.
Enter revenue for the period.
Enter cost of sales to get gross profit and gross margin.
Enter operating expenses and any other income to get operating profit and operating margin.
Enter finance costs and tax to get profit before tax and net profit.
Last data update
July 7, 2026
Sources and references
Companies Act 2006, Sch 1 (profit and loss account formats); standard management accounting waterfall (gross / operating / PBT / net profit).
The data in this calculator is updated regularly to reflect the latest official rates. When in doubt, consult the official sources listed above.
Leave it at zero — the calculator will base operating profit on gross profit less operating expenses only, which is correct if there is no other income to add.
Each margin isolates a different layer of the business — gross margin shows product/service economics, operating margin shows core trading efficiency, and net margin shows the bottom-line result after financing and tax, so tracking all three shows where profit is being gained or lost.