Free trading calculators
Free, browser-based tools for sizing positions, planning trades, and stress-testing your risk. Every calculator runs entirely on your device — no signup, no tracking, no data sent to a server. We built these because we use them ourselves every trading day.
Position Size Calculator (Free, Built for Active Traders)
Free position size calculator. Enter your account size, risk %, entry, and stop, get your exact share count, dollar risk, and R:R in one click.
Kelly Criterion Calculator (with Half & Quarter Kelly)
Free Kelly Criterion calculator. Enter your win rate, avg win, avg loss, get the mathematically optimal position size + safer half-Kelly and quarter-Kelly fractions.
Forex Position Size Calculator (Lots, Pips, USD Risk)
Free forex position size calculator. Enter account, risk %, stop distance in pips, and pip value, get exact lots (standard, mini, micro) for any currency pair.
Futures Position Size Calculator (ES, NQ, CL, GC, Micros)
Free futures position size calculator. Enter account, risk %, stop distance in points, and contract multiplier, get exact contract count for ES, NQ, CL, GC, or any futures product.
Trading Risk Calculator, Verify You're Sized Right
Free trading risk calculator. Enter your trade details, see total $ risk, % of account at risk, and how many consecutive losses you could survive at this sizing.
Stop Loss Calculator, Find Your Exit Before You Enter
Free stop loss calculator. Enter your account size, risk %, entry price, and share count, get the exact stop-loss price that caps your loss at your target risk.
Risk/Reward Ratio Calculator (with Breakeven Win Rate)
Free risk/reward ratio calculator. Enter your entry, stop, and target, get the R:R ratio plus the win rate you need to break even at that ratio.
Trading Profit Calculator, Stock P/L in Dollars + Percent
Free trading profit calculator. Enter your buy price, sell price, shares, and commissions, get your exact dollar profit, % return, and breakeven price.
More on the way
We're rolling out a new calculator every week, prioritized by what traders actually search for: Kelly criterion, forex + futures position sizing, risk-of-ruin, stop-loss distance, and compound interest. Bookmark this page or join the newsletter to know when they go live.