Financial Tools
Free online financial calculators — no sign-up required
Core Tools
Compound Interest Calculator
Forward & reverse compound interest — dual frequency settings for contributions and compounding
FIRE Planner
4% Rule based retirement planning — binary search to find your FIRE number and timeline
Product Comparator
Weighted scoring + merge sort — compare interest rates, fees, and requirements on one scale
Coming Soon
Portfolio Optimizer
Find the optimal allocation across stocks, bonds, and cash for your risk tolerance
Monte Carlo Simulator
Run thousands of market scenarios to see the probability of reaching your goals
DCA Strategy Tester
Compare Dollar-Cost Averaging, Value Averaging, and lump-sum strategies
Fund Correlation Analyzer
Check if your funds are truly diversified — build uncorrelated portfolios
Strategy Backtester
Test trading strategies against historical data before risking real money
Quick Calculators
Percentage, discount, tip, mortgage — 9 everyday math tools
Browse all 9 quick calculators