Free Trading Tools
Free, no sign-up, computed in your browser. The same arithmetic PreTrAIde uses in a full pre-trade analysis.
Position Size Calculator for Stocks
A position size calculator estimates how many shares fit a chosen loss limit: divide the dollar amount you are prepared to risk by the difference between your entry price and stop-loss price. Enter your account size, risk per trade, entry price and stop-loss price to see the share count, position value, estimated money at risk and position as a percentage of your account.
Trading Cost Calculator: Spread, Market Impact and Commission
A trading cost calculator estimates what a stock order may cost beyond its quoted share price: the bid-ask spread, market impact and broker commission. Enter the order value, share price, average daily volume, daily volatility and commission to see estimated costs in US$ and basis points, plus the order’s size relative to daily volume.
Portfolio Concentration Calculator: HHI and Largest Weight
This portfolio concentration calculator shows how much of your portfolio sits in each stock and sector. Enter each position’s value and sector to see its weight, a 0–10,000 Herfindahl-Hirschman Index (HHI), the effective number of stocks, your largest position and sector, and a concentration reading.
Value at Risk (VaR) Calculator for a Stock Position
A Value at Risk (VaR) calculator estimates a loss threshold for a stock position over a chosen number of days at a chosen confidence level. Enter the position value, daily or annualized volatility, a 95% or 99% confidence level, and the horizon to calculate parametric VaR in dollars.
Pre-Trade Checklist: 12 Checks Before You Buy a Stock
Before you buy a stock, write down why, decide how you will place the order, check its likely costs and risks, and consider how it changes your portfolio. This 12-point pre-trade checklist helps you do that systematically; it cannot tell you whether a stock will be profitable.
Trading Cost by Stock
Estimated bid-ask spread, market impact, volatility and 1-day value at risk for $1,000, $10,000 and $100,000 orders in US and European stocks, refreshed daily.
Retail Execution Cost Index
How much a $10,000 stock order costs in spread and market impact, by market and by sector, across US and European stocks. Updated daily.
Check your next trade before you place it
Build a basket, run a pre-trade analysis, and get a GO, NO-GO or MODIFY verdict with the cost, liquidity and risk behind it.
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