Doug Investment Calculator
MAKE YOUR MONEY CLEAR

Simple calculations with Doug Compound.
Clearer investment decisions.

How much could you save? How much did you earn?
Understand both the numbers and the principles behind them.

Doug Compound is the compound growth tool from Doug Investment Calculator. Compare future balances using an initial amount and monthly contributions, and explore the calculation along the way.

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Compound Interest Calculator

Compare projected balances using an initial amount and monthly contributions.

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Investment Return Calculator

Calculate gains and losses after buy and sell fees.

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Average Cost Calculator

See your average cost, total investment and unrealized return after buying more.

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Overseas Stock Tax

Estimate Korean tax using realized gains and the basic deduction.

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Deposit Calculator

Calculate the after-tax maturity value of a lump-sum deposit.

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Monthly Savings Calculator

Calculate the maturity value of regular monthly deposits.

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PLAY / 8 QUESTIONS

What kind of investor are you?

What would you do in a downturn? Explore your investing style with eight questions, just for fun.

Find out in 2 minutes →
Calculations run in your browser. Your investment inputs are not sent to the app server.
LEARN BEFORE YOU INVEST

How to read your results

Investing basics

Are compound growth and average annual return the same?

Understand a 7% annual assumption and the pitfalls of simple averages.

Investing basics

Why does a 50% loss need a 100% gain to recover?

Understand loss rates, recovery returns and additional investment amounts.

Explore guides on fees, diversification, FX and savings →

About Doug Investment Calculator

We show the inputs and assumptions needed for each calculation clearly. Each tool includes instructions, numerical examples and excluded costs. Results depend on your assumptions or data; they are not recommendations to buy or sell any security.

Start planning with the compound calculator and checking trade outcomes with the return calculator. Before buying more, review the total investment as well as your average cost.