Investment Calculator Hub | Compound, Kelly, DCA, Rule of 72
Choose the right calculator for compound growth, Kelly position sizing, Rule of 72 doubling time, DCA investing, retirement planning, or loan payments.
Flagship calculators
All 12 calculators โAll 12 calculators
Compound Calc
Visualize the power of compound interest.
Open โ02Loan Interest Calculator
Compare monthly payments and total interest.
Open โ03Retirement
Plan how much you need for retirement
Open โ04Rule of 72
Estimate how fast your money doubles
Open โ05ROI
Measure your return on investment
Open โ06Inflation
See how inflation erodes purchasing power
Open โ07FIRE
Calculate your path to Financial Independence, Retire Early
Open โ08Savings Goal
Plan your path to your savings target
Open โ09Kelly Criterion
Optimize your bet size and avoid ruin.
Open โ10Dividend
Project your dividend income growth
Open โ11DCA
See the power of regular investing
Open โ12Asset Tools
Avg price calc & leverage analysis.
Open โBrowse by problem
Position sizing
Open sizing tools before you decide how large a position to take.
Growth
Compare compound, Rule of 72, dividend, and recurring-investment scenarios.
Planning
Estimate savings goals, retirement runway, and FIRE targets in one place.
Cash flow and risk
Stress-test loan, asset, ROI, inflation, and market assumptions.