Enter entry, stop and exit. Get the R result — profit or loss as a multiple of the risk you set. Optional size turns that into dollars.
This winner is +2R — profit or loss as a multiple of the $5.00 you risked per unit. Log it as +2R in the journal so a small account and a large account compare on one scale.
Mantis computes R-multiple on every closed trade from the entry, stop and exit you logged — so the journal speaks R, not just dollars.
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Whatever you risk from entry to stop is one unit of risk. Buy at $100 with a stop at $95 and 1R is $5 per share. Short at $100 with a stop at $105 and 1R is still $5. The sign of the stop tells the calculator the direction.
R = (exit − entry) ÷ (entry − stop). Exit at $110 on the long and you have +2R. Exit at the stop and you have −1R. Exit at entry and you have a scratch (0R). The same formula covers shorts without flipping inputs around.
Position size turns R into P/L. 20 shares, $5 of risk, +2R is +$200, with $100 of dollar risk. Clear size if you only want the R. Pair it with the risk-reward calculator for the plan, and this page for the result.
The default long: $100 in, $95 stop, $110 out, 20 shares. Initial risk $5/share ($100). Result +2R and +$200. Change the exit to $95 and it is −1R. Change it to $97.50 and it is +0.5R.
If the blotter only has dollars, you cannot reconstruct R after you change size. Write the stop on the way in. When you close, the journal should compute R from those three prices. That is what Mantis does on every fill.
Average R across a sample is the process. Average dollars are the account. A week of +0.4R winners on a 2R plan is management drift. The how-to spoke: how to track R-multiple in a trading journal.
An R-multiple expresses profit or loss as a multiple of the amount you planned to risk. Your initial stop distance is 1R. If you risk $100 and make $200, the trade is +2R; if the stop fills, it is −1R. Sizing every trade to the same R lets you compare a 20-share day trade and a 2-lot swing on one scale.
R = (exit − entry) ÷ (entry − stop). The same formula works for longs and shorts. Long $100, stop $95, exit $110: (110 − 100) ÷ (100 − 95) = +2R. Short $100, stop $105, exit $90: (90 − 100) ÷ (100 − 105) = +2R. Exit at the stop and you get −1R.
Related, not the same. Risk-reward is the plan: target distance versus stop distance before you enter. R-multiple is the result: where you actually exited, in units of that planned risk. A 1:3 plan that you scratch at breakeven is 0R, not 3R. Log both.
Log both, review in R. Dollar P/L is what the account feels. R is what the process did. A +$80 winner that was 0.3R and a +$80 winner that was 2R are not the same trade. Optional position size in this calculator turns R into dollars when you want both.
Yes. It runs in your browser, needs no sign-up, and does not send the numbers you type to a server. Mantis, our iOS trading journal, computes R-multiple on every closed trade from the entry, stop and exit you logged.
Important: Mantis is a trading journal and analytics tool. This calculator is for educational purposes and is not investment advice, not financial advice, and not a recommendation to buy or sell any security or instrument. Trading involves risk; past performance does not guarantee future results. Consult a qualified professional before making financial decisions.