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CompoundFX: Compound Interest Calculator
Know what you’ll have and what it takes to get there.
CompoundFX goes beyond a basic compound interest calculator. Project investment growth or set a goal, like $1M by age 60, and solve for the rate, time, starting principal, or contribution needed to get there. Compare scenarios, account for inflation, taxes, and fees, and explore interactive charts and year-by-year results. The web calculator is free and private, with no sign-up required.
Hi Product Hunt!
I’ve been building software for more than 20 years, and somewhere along the way, I got really interested in investing. I learned investing the hard way by putting real money into the market and quickly discovering how much I didn’t know. A few painful lessons later, I became far more interested in understanding how long-term investing actually works and how small decisions compound over time.
As I started digging into the numbers, I found myself constantly running different scenarios. What if I invested a little more each month? What if the return was lower? How much difference would another five years make? What would it actually take to reach my goal? Being a software developer, I started building something. That something became CompoundFX.
Most compound interest calculators could tell me what I’d have after I plugged in all the numbers. What they couldn’t tell me was what it would take to get there. That idea became Goal Mode. Set a target like $1M by 60, and CompoundFX works backward to figure out the missing piece. That might be the return you need, how long it will take, what you need to start with, or how much you need to contribute.
I also cared a lot about privacy. These financial scenarios are personal, and I don’t think you should have to give up your data just to run some numbers. CompoundFX runs fully offline with no accounts, analytics, or data collection. Your numbers never leave your device.
The iOS app is free to download and includes the full calculation engine, live growth charts with milestones, year-by-year breakdowns, and inflation, tax, and fee adjustments. A one-time $4.99 purchase unlocks Goal Mode, unlimited saved scenarios, side-by-side comparisons, and PDF reports. It's not a subscription!
There’s also a free web calculator at compound-interest-calculator.app if you just want to run some numbers without downloading anything. I’d love your feedback!
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About CompoundFX: Compound Interest Calculator on Product Hunt
“Know what you’ll have and what it takes to get there.”
CompoundFX: Compound Interest Calculator was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #118 on the daily leaderboard. CompoundFX goes beyond a basic compound interest calculator. Project investment growth or set a goal, like $1M by age 60, and solve for the rate, time, starting principal, or contribution needed to get there. Compare scenarios, account for inflation, taxes, and fees, and explore interactive charts and year-by-year results. The web calculator is free and private, with no sign-up required.
CompoundFX: Compound Interest Calculator was featured in iOS (110.8k followers), Fintech (47.5k followers) and Personal Finance (2.9k followers) on Product Hunt. Together, these topics include over 63.2k products, making this a competitive space to launch in.
Who hunted CompoundFX: Compound Interest Calculator?
CompoundFX: Compound Interest Calculator was hunted by George Catobus. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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George Catobus