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Profit Margin Calculator
Calculate profit, margin, and markup from revenue and cost.
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Simple calculators for margins and other practical business numbers.
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Percentage Calculator
Solve five common percentage calculations with formulas and working.
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UK Salary & Income Tax Calculator
Estimate 2026/27 UK take-home pay with Income Tax, NI, pensions, and student loans.
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UK Mortgage & Loan Calculator
Estimate UK mortgage or personal-loan repayments, interest, overpayments, and amortisation.
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Age Calculator
Calculate calendar age, elapsed time, and the next birthday.