
Compounder - The Interest Tool
Compound interest calculations
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Free
In-App PurchasesWith Ads
About
Compounder — The Compound Interest Calculator
Compound interest is the most powerful force in personal finance. Compounder shows you exactly what it means for your money.
GROWTH CALCULATOR
Enter your starting balance, annual return rate, and how long you're investing. Add a periodic contribution and compound frequency to fine-tune the projection. Watch a number you recognise turn into one that doesn't feel real.
WITHDRAWAL CALCULATOR
Got a pot? Find out how long it lasts. Set a withdrawal amount, inflation rate, and frequency — and see the year your savings run out (or don't).
CHARTS & YEARLY VALUES
Visualise your growth curve or see every single year mapped out. Useful for planning. Mildly addictive for everyone else.
TERMINOLOGY GUIDE
Every field explained, clearly. No jargon, no assumptions.
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Compounder is free to use. Remove ads and help the developer with a one-time purchase to unlock the full experience.
Part of the FiHub app family — alongside Rewirement (in-depth retirement planning) and Stocker (simplified stock analysis).
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What's New in Compounder
1.5
April 29, 2026
AdMob fixes
1
In-App Purchases
$1.99
Compounder UK
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