Compound Interest Calculator App
Prosper helps you model compound growth across decades with your contribution and return assumptions, so you can evaluate realistic long-term outcomes.
Contributions + growth
Simulate recurring contributions with expected annual growth to understand accumulation pace over time.
Tax-aware outcomes
Estimate net outcomes by configuring tax behavior on sell events and account-level tax treatments.
Inflation-aware planning
Because a million bucks in 2050 won't buy what it does today. Stress-test assumptions to keep your purchasing power real.
Scenario snapshots
Save variations of your assumptions. Compare the "safe" path with the "if everything goes perfectly" dream scenario.
Planning tips
- Use a conservative baseline return.
- Model one stress scenario with lower growth and higher costs.
- Compare outcomes before locking down recurring contributions.
