TurnCompound: Interest Calc

Plan Your Financial Future — Spin, Explore, Decide

TurnCompound puts the power of compound interest at your fingertips — literally. Use the interactive Dial to spin through scenarios in real time, watching your money grow with every turn. No spreadsheets, no complexity.

Whether you need a compound interest calculator, retirement calculator, savings goal planner, or FIRE calculator, TurnCompound has all four in one app. As your financial calculator and growth planner, it adapts to any scenario you can imagine — from your first $100 to your retirement nest egg.

Four Powerful Calculators in One App

Investment Growth
Set your starting balance, expected return, and contribution frequency. Add monthly savings or lump-sum deposits at any point in your timeline. See your total value broken down into contributions and earned interest — instantly.

Withdrawal Simulator
How long will your portfolio last? Simulate retirement income or early withdrawal strategies. Get a clear picture of your ending balance, total withdrawals, and exactly when your money runs out — if it does.

Savings Goal Planner
Set a target and we'll tell you exactly how much to save each month. Adjust your timeline, return rate, and starting amount to find the plan that fits your life.

Coast FIRE Calculator
Find out how much you need to save now so your investments grow on their own — no more contributions needed. Set your target retirement age and see your Coast FIRE number, the age you can stop saving, and how your money coasts to your goal.

The Dial — A New Way to Plan
Forget typing numbers. Spin the dial to adjust any parameter — initial amount, monthly savings, years, return rate — and watch your results update live. It's financial planning that feels intuitive.

Interactive Charts & Tables
- Year-by-year breakdown of your investments
- Stacked bar charts separating principal from interest
- Drag across the chart to explore any year in detail
- Switch to table view for exact numbers
- Haptic feedback as you explore

Fully Customizable
- 9 currencies supported (USD, EUR, GBP, BRL, JPY, and more)
- Set your default return rate and compound frequency
- Weekly, monthly, quarterly, or yearly contributions
- All settings update calculations in real time

Designed for Simplicity
- Clean, distraction-free interface
- Dashboard with sparkline previews of all calculators
- No login required — just open and calculate
- Your settings persist automatically

Who's It For?
- First-time investors
- FIRE (Financial Independence, Retire Early) planners
- Coast FIRE enthusiasts
- Retirement savers
- Anyone who wants to stop guessing and start planning

You don't need to be a financial expert to understand the power of compound interest. Start spinning your future — one turn at a time.