PRISM offers two free calculators: a position size calculator, which turns your account size, risk % and stop-loss distance into a lot size, and a pip value calculator, which shows what one pip or point is worth per lot. Both run in your browser, nothing you type is sent anywhere, and the formula is shown step by step.
Enter your account size, the percentage you are willing to risk and your stop-loss distance; get the lot size that keeps the loss at your stop to that amount.
See what a one-pip (or one-point) move is worth in US dollars for a standard, mini and micro lot on forex, gold, silver, indices, oil and Bitcoin.
The same 30-pip stop can cost $30 or $3,000 depending on the size of the trade. Fixing the share of the account you risk on one trade — many traders use 0.5–2% — and deriving the size from the stop keeps one bad trade from doing outsized damage. PRISM's 80% ranges can help you judge whether a stop is inside the market's normal 48-hour noise; the calculators then turn that stop into a size.