Tools & Calculators
Free, interactive calculators for compound interest, savings, investing, pensions, ISAs, inflation, net worth, and mortgage overpayments — built for UK investors planning their own numbers.
Growth & Investment Calculators
Project how lump sums and regular contributions could grow, and compare different ways of investing the same money.
Compound Interest Calculator
Work out how a starting amount plus monthly contributions grows with compound interest.
Read guide →Savings Calculator
Project the future value of a savings pot from an initial balance and regular deposits.
Read guide →Investment Growth Calculator
See how an initial investment plus monthly top-ups could grow at an assumed rate of return.
Read guide →Investment Return Calculator
Turn a purchase value and current value into a total and annualised percentage return.
Read guide →Regular Investment Calculator
Estimate the future value of a monthly investment plan over any time horizon.
Read guide →Lump Sum vs Regular Investment Calculator
Compare investing a lump sum today against drip-feeding the same money in monthly.
Read guide →Savings vs Investment Calculator
Compare a cash savings rate against an assumed investment return over the same period.
Read guide →Pension & Retirement Calculators
Model pension growth, retirement income, and whether you're on track for the retirement you want.
Pension Growth Calculator
Project a pension pot from its current value, your contributions, employer contributions and growth.
Read guide →Pension Income Calculator
Turn a pension pot and a withdrawal rate into an illustrative annual and monthly income.
Read guide →Retirement Calculator
Estimate your retirement fund from your current age, savings, contributions and expected return.
Read guide →“How Much Do I Need to Retire?” Calculator
Project your retirement pot and compare it with what you'd need to fund your desired income.
Read guide →ISA, Inflation & Net Worth Calculators
Tools for ISA planning, understanding inflation's effect on your money, tracking net worth, and mortgage overpayments.
ISA Calculator
Project the potential value of a Stocks & Shares ISA from annual contributions and assumed growth.
Read guide →Inflation Calculator
See how inflation affects the future cost of goods and the future purchasing power of money.
Read guide →Inflation Erosion Calculator
Find out how much purchasing power a cash savings balance loses to inflation over time.
Read guide →“What Will £100,000 Be Worth in 20 Years?” Calculator
A simple inflation visualiser: see what today's money is worth after years of inflation.
Read guide →Net Worth Calculator
Add up your assets and liabilities to see an estimated net worth figure.
Read guide →Mortgage Overpayment Calculator
See how extra monthly overpayments shorten your mortgage term and cut the interest you pay.
Read guide →