Free calculators for sizing trades and managing risk before you place them. Run the numbers here, then practice them with virtual money on the JagSim simulator.
How many shares to buy based on your account, risk %, entry and stop-loss.
Your R:R ratio, dollar risk and reward per share, and breakeven win rate.
Ending balance and total growth when returns compound over multiple periods.
Max shares and position value sized around your stop and a max loss.
Good trading is mostly risk management, and these calculators handle the math so you decide with clear numbers instead of a gut feel. Use the position size calculator to work out how many shares fit your account and risk before you enter, the stop-loss calculator to cap the most you can lose on a trade, the risk/reward calculator to check that a setup pays enough to be worth taking, and the compound return calculator to see how steady returns add up over time.
Numbers on their own do not build skill, though. Once a position is sized, practice actually placing and managing it with virtual money on JagSim. Create a free account to save your paper portfolio, or try the demo first, and rehearse entries, exits, and stops on real delayed charts without risking a dollar. These are learning tools, not investment advice.
Paper trading overview · Free stock market simulator
Educational tools. Not investment advice. JagSim is a simulator, not a broker.
Last updated: July 2026