Investment Calculators
Free tools to help you understand investing concepts. Play with numbers, see how things work, and build your financial intuition.
All Calculators
Showing 23 of 23 calculators
Compound Interest Calculator
See how your investments grow over time with regular contributions and compounding. Visualize the power of compound growth.
DCA vs Lump Sum Calculator
Compare dollar-cost averaging vs lump sum investing. See how each strategy performs over time.
CAGR Calculator
Find the annualized return of any investment. Enter beginning value, ending value, and time period.
Rule of 72 Calculator
Estimate how long it takes to double your money at a given return rate using the Rule of 72. Compare with exact doubling time.
P/E Ratio Calculator
Calculate the price-to-earnings ratio for any stock. Compare against sector averages and see earnings yield.
Expense Ratio Impact Calculator
See how fund fees eat into your returns over time. Compare low-cost index funds vs high-fee funds and see the true cost of expenses.
Inflation-Adjusted Return Calculator
See your real investment returns after inflation. Compare nominal vs inflation-adjusted growth and understand purchasing power erosion over time.
Dividend Growth & DRIP Calculator
See how dividend growth and DRIP compounding build wealth over time. Calculate yield on cost and total returns.
Dividend Yield Calculator
Calculate dividend yield from share price and annual dividend. See quarterly payments and estimate your annual dividend income.
EPS Calculator
Calculate earnings per share from net income and shares outstanding. Understand a company's profitability on a per-share basis.
ROI Calculator
Calculate your return on investment. Enter initial cost and final value to see total ROI percentage and annualized return.
50/30/20 Budget Planner
Split your income using the popular 50/30/20 rule. See exactly how much to allocate for needs, wants, and savings.
Emergency Fund Calculator
Find out how much you need saved based on your expenses, income stability, and dependents.
FIRE Calculator
Calculate your financial independence number, time to FIRE, and Coast FIRE age. See how savings rate and returns affect your path to financial independence.
401(k) Calculator
Project your 401(k) balance at retirement with employer match, salary growth, and investment returns. See the power of employer matching.
Retirement Savings Calculator
See if you're on track based on your age, savings, and contributions. Estimate how long your retirement savings will last.
Take-Home Pay Calculator
Calculate your net income after federal tax, state tax, and FICA. See your take-home pay per paycheck for all 50 states with 2025 tax brackets.
Options Profit & Payoff Calculator
Calculate breakeven, max profit, and max loss for calls, puts, and short positions. Visualize options risk.
Stock Profit/Loss Calculator
Calculate your profit or loss on any stock trade. Enter buy price, sell price, and shares to see total return, percentage gain, and net proceeds after commissions.
Stock Average Calculator
Calculate your average cost basis across multiple stock purchases. See how averaging down or up changes your break-even price.
Capital Gains Tax Calculator
Calculate estimated federal tax on stock sales based on income, holding period, and filing status.
Position Size Calculator
Calculate how many shares to buy based on your account size, risk tolerance, and stop-loss level. Manage risk on every trade.
Stock Split Calculator
Calculate post-split share price and number of shares after a stock split or reverse split. See how splits affect your holdings.
Want to understand the concepts behind these tools?
Start a free courseInvestment Calculators for Beginners
Understanding investing starts with understanding the numbers. These free calculators let you experiment with financial concepts — from compound interest and dollar-cost averaging to retirement planning and options analysis — so you can see how different inputs affect outcomes.
Each calculator is designed to complement our free courses. Learn a concept in a lesson, then use the corresponding calculator to explore it with your own numbers. All results are illustrative and for educational purposes only.
Frequently Asked Questions
A compound interest calculator shows how an investment grows when returns are reinvested over time. You enter a starting amount, a contribution schedule, an expected rate of return, and a time horizon. The calculator shows year-by-year growth so you can see how compounding accelerates over longer periods.
Start with the concept you want to explore. If you want to understand how savings grow, try the Compound Interest Calculator. If you are comparing investing strategies, use DCA vs Lump Sum. For personal finance basics, the Budget and Emergency Fund calculators are a good starting point. Each calculator page explains what it does and links to related lessons.
Calculator results are not saved between sessions. However, you can bookmark the page and re-enter your inputs. Some calculators offer a CSV export for the data tables, which you can save to your computer.
The calculators use standard financial formulas and are accurate for the inputs you provide. However, real-world returns vary based on market conditions, fees, taxes, and other factors that simplified calculators cannot fully capture. Results are for educational illustration, not financial planning.
Calculators let you experiment with different scenarios to build intuition. For example, you can see the difference between saving for 20 years vs. 30 years, or compare a 6% return vs. an 8% return. This hands-on exploration reinforces the concepts taught in our free courses.
Learn the Concepts First
Calculators work best when you understand the underlying concepts. These free courses will give you the foundation you need.