Free Financial Calculators for UK Residents
From ISA projections to FTSE stock analysis to buying a business — clear answers to your real money questions.
UK residents face a distinctive set of financial decisions shaped by tax-advantaged savings vehicles, a competitive property market, and a regulatory environment that differs meaningfully from the US or Europe. Whether you're modelling your ISA contributions, deciding whether to take a pension lump sum or annuity, evaluating a business purchase, or trying to make sense of a FTSE-listed stock, the underlying maths is the same as any finance textbook — but the context is very much British.
The Individual Savings Account (ISA) allows you to invest up to £20,000 per tax year with no income tax or capital gains tax on growth or withdrawals. Modelling the compound growth of annual ISA contributions over 20 or 30 years is exactly what the Future Value calculator does. At 7% annual return — roughly the long-run real return on a globally diversified equity portfolio — a £10,000 annual contribution grows to around £1 million over 30 years. The Present Value calculator answers the mirror question: if your target is £500,000 in 20 years, how much do you need to invest today?
The Bank of England base rate directly shapes the risk-free rate used in every discount rate calculation. When the base rate is 5%, UK gilts yield close to that, and every expected return on a riskier investment gets measured against it. The CAPM calculator shows what a specific FTSE 100 or FTSE 250 stock should return based on its beta — its sensitivity to broader market movements. If a stock's expected return is lower than its CAPM-required return, it may be overpriced.
For UK business owners and buyers, the corporation tax rate of 25% (for profits over £250,000, as of April 2023) shapes the true after-tax cost of debt. The WACC calculator combines your cost of equity (from CAPM) and after-tax debt cost to find the minimum return any capital investment in the business needs to generate. The UK has over 5.5 million small and medium-sized enterprises — the DCF and multiples calculators help buyers and sellers agree on a number that's grounded in the business's actual earnings.
All calculators default to GBP when you visit this page. Every formula works identically regardless of currency — the maths of compound interest and discounted cash flows is universal. The only thing that changes is the symbol in front of the number.
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Use the Future Value calculator with your annual ISA contribution as PMT, 7% as your expected return, and the years until you need the money as n. The result shows your projected pot in today's purchasing power. Adjust the rate down to 5% for a more conservative bonds-heavy portfolio.
Use the DCF calculator with the business's annual free cash flows, a terminal value of 4–6x the final year's profit (typical for UK SMEs), and a discount rate of 12–18% depending on the risk level. If the DCF value exceeds the asking price, the acquisition is financially justified.
Use the CAPM calculator with rf = the current UK gilt yield (approximately 4.5%), the stock's beta, and rm = 9–10% (FTSE 100 long-run total return including dividends). The required return tells you the minimum the stock must deliver. Compare it to the analyst consensus expected return.
Everything is free — no account required
Every calculator on this site is free to use without creating an account. All results are calculated in your browser — nothing is sent to a server. If you want to save your calculations, track your learning progress, or access full worked answers to practice questions, a Pro account is available — but everything core is and always will be free.