Plan your money with numbers you can trust
Retirement, compound interest, FIRE, savings and investment calculators that show their working - with live charts, inflation built in, and plain-English insights written around your own numbers.
Compound interest, live
Change any figure and every number, chart and insight updates as you type. This is the same calculator as the full page, embedded here.
Five tools that answer the questions people actually ask
Each one gives you the number, the chart behind it, and what to change if you do not like the answer.
Retirement Calculator
See the pot you are on course for, what it buys after inflation, and the gap to the income you want.
Open calculator →Compound Interest Calculator
Watch interest earn interest. Daily, monthly, quarterly or yearly compounding with a live growth chart.
Open calculator →FIRE Calculator
Your financial independence number, the year you reach it, and where Coast, Lean and Fat FIRE sit.
Open calculator →Savings Goal Calculator
Either how long your goal takes, or what to put away each month to hit a deadline.
Open calculator →Investment Return Calculator
Project a portfolio forward under three market scenarios, or measure the return you already made.
Open calculator →Built to be trusted, not just used
Your figures stay yours
Every calculation runs inside your browser. Nothing you type is transmitted, logged or stored on a server.
The maths is published
Every formula is written out on our methodology page, including the assumptions we make and the ones we refuse to make.
Wherever you are
Dollars, pounds, euros, Canadian and Australian dollars, New Zealand dollars and rupees - with country guides for the big FIRE markets.
Straight answers, with a calculator attached
Get the Retirement Readiness Report
A one-page summary of your projected pot, income, readiness score and the exact monthly change that closes your gap.
No spam, and one click unsubscribes. We never sell your details. See our privacy policy.
Want the Free Money Planner Pack?
The plain-English guide to using these calculators well.
One email, then a short weekly note. Unsubscribe any time.