What is the Capital Gains Tax Calculator?
The Capital Gains Tax Calculator is a free online tool that helps you short/long-term tax owed on gains It runs entirely in your browser, gives an instant result, and needs no sign-up, download or spreadsheet.
Holding period usually decides your tax rate — short-term gains are taxed higher than long-term — and fees, spreads and slippage quietly reduce every result.
Whether you trade stocks, forex, options, crypto or futures, the capital gains tax is the same calculation — so this tool works for any market. Use it before you place a trade to base your decision on real numbers instead of a guess.
How to use the Capital Gains Tax Calculator
Using the capital gains tax calculator takes only a few seconds:
- Enter your figures in the capital gains tax calculator above — the fields are filled with an example you can replace.
- Read the highlighted result; it updates instantly as you type.
- Add your broker’s fees or commissions where relevant for a true net figure.
- Change any input to compare scenarios before you commit to the trade.
Capital Gains Tax formula & example
The capital gains tax formula is: Tax owed = realised gain × applicable capital-gains rate.
A $2,000.00 gain at 20% ≈ $400.00 owed, leaving $1,600.00 after tax. Long-term rates are usually lower than short-term.
When to use the Capital Gains Tax Calculator
Reach for the capital gains tax calculator whenever you’re planning a trade and need to know your capital gains tax in advance. Running the number first keeps your decisions consistent and stops a single trade from doing outsized damage to your account. Traders who make this a habit — checking before every entry — are the ones who protect their capital over the long run.
Why use a capital gains tax calculator?
Doing capital gains tax by hand is slow and error-prone — a misplaced decimal or a forgotten fee can turn a winning plan into a losing one. The capital gains tax calculator removes that risk: it applies the correct formula every time, updates the moment you change an input, and lets you test several scenarios in seconds.
That speed matters in live markets. When a setup appears you can size it, check the reward against the risk, and act before the opportunity passes — without second-guessing your arithmetic.
- Instant, accurate capital gains tax with no spreadsheet
- Free, with no account, login or download
- Works on mobile and desktop, right in your browser
- Useful for stocks, forex, options, crypto and futures
Tips for accurate capital gains tax
- Use your real entry, exit and size — not round-number guesses.
- Include fees and spread; small costs add up across many trades.
- Recalculate whenever your price, size or stop changes.
- Round against yourself to leave a margin for slippage.