Quirkulator

Investing & Savings Calculators

22 calculators covering contributions, growth and goals, each with its formula and worked examples.

Investing & Savings Calculators brings together 22 calculators for contributions, growth and goals, including Annuity Payout Calculator, FIRE Number Calculator, Investment Return Calculator and Pension Drawdown Calculator.

These are separate pages rather than one tool with a mode switch because the inputs differ, the interpretation differs, and the question behind each one is different. Each page opens with the formula it uses, defines every variable, and walks the calculation through real numbers before you type anything.

All 22 pages compute in your browser: nothing you type is sent anywhere, and results update as you edit. Each one carries worked examples, interpretation bands where a score needs context, and a FAQ answering what people actually ask about that calculation.

The collection is part of Money & Finance, and every page links to the neighbouring calculations you usually need next.

22 pages in this collection

Annuity Payout CalculatorTurn a lump sum into a level income that runs for a fixed number of years.CAGR CalculatorFind the compound annual growth rate between a starting and ending value.Coast FIRE CalculatorFind the balance that grows into full independence with no further contributions.Emergency Fund CalculatorSize a cash buffer from your essential outgoings and see how long it takes to build.FIRE Number CalculatorFind the portfolio that covers your spending forever at your chosen withdrawal rate.Future Value CalculatorFind the future value of a present sum plus a stream of equal payments.Inflation CalculatorSee what a price becomes after years of inflation, and what today’s money will still buy.Internal Rate of Return CalculatorFind the discount rate at which a project’s cash flows exactly repay their cost.Investment Return CalculatorMeasure total return including income, and convert it to an annualised figure.Lumpsum Investment CalculatorProject what a single one-off investment grows into, before and after inflation.Net Present Value CalculatorDiscount a project’s future cash flows back to today and net off what it costs.Net Worth CalculatorAdd up everything you own, subtract everything you owe, and see what is left.Payback Period CalculatorWork out how long a project takes to return its cost, with and without discounting.Pension Drawdown CalculatorSee how many years a pension pot lasts when withdrawals rise with inflation each year.Present Value CalculatorDiscount a future sum or a stream of payments back to what it is worth today.Retirement Savings CalculatorProject your retirement pot at your chosen retirement age and the income it supports.ROI CalculatorWork out return on investment as a percentage of what the investment cost.Rule of 72 CalculatorEstimate how long money takes to double, and check the shortcut against the real maths.Savings Goal CalculatorFind the monthly amount needed to reach a savings target by a chosen date.Savings Rate CalculatorFind what share of your take-home pay you save, and what that implies for retiring.SIP CalculatorProject the maturity value of a systematic investment plan with monthly contributions.Withdrawal Rate CalculatorCheck what percentage of your portfolio you are drawing, and how long it can last.

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