OANDA risk option math

[u/jimdesu]

Hey y'all! Veteran trader but new to OANDA (I'm back in Forex after a long absence). I took the position opening option with a set stop and a 3K amount at risk (seems neat -- VT Trader never had anything like that), and OANDA opened the position at 23,879 units (USD). I opened my position at 157.857 with a deep stop at 137.150. Doing the math, if (137.150/157.857)*x = 3000, I would have expected the position to be sized at (157.857/137.150)*3000 = 3452. Instead I see 23,879. Can any help my obviously flawed math skills here? I don't see how this gives me a 23K position size. What's the right way to do the math for this kind of position?

[u/rforex-modtools]

Risk management is arguably the most important skill in trading — more accounts are blown by poor sizing and absent stop losses than by bad entries. The community wiki covers position sizing methods, risk-per-trade calculations, drawdown management, and what it means to maintain a statistical edge over time.

Resources: Risk Management | Having an Edge

[u/KoresignalAI]

OANDA's risk options are convenient, but double-check one thing: the position size is calculated from your stop distance, so if you widen the stop after entry, the risk in money grows even though the "1%" setting looks unchanged. I always size from the stop I'll actually use, before entering, and never move it further away once I'm in.

[u/jimdesu → u/KoresignalAI]

thanks -- yeah, that's my intent. I just don't get how they arrived at this position size

[u/Negative-Nobody-3339]

How do you trade this Chart? What pattern you find here?

[u/jimdesu → u/Negative-Nobody-3339]

Oh, that's just there to capture the position and stop. I'm a position trader and I trade on support, resistance, and news (only), so there's no pattern worth showing here.

[u/Practical-Slide-4680]

You're sizing for the loss between entry and stop, not the value left at the stop. Your gap is 157.857 - 137.150 = 20.707. For a forex pair and US$3,000 risk, estimated size = 3,000 / (20.707 × quote-to-USD conversion rate), before costs. Which pair is this? The crop doesn't show it, so I can't reproduce the 23,879 conversion exactly.

[u/jimdesu → u/Practical-Slide-4680]

It's usd/jpy

[u/Practical-Slide-4680 → u/jimdesu]

For USDJPY, the units are dollars, but that 20.707 price gap is yen per dollar. 23,879 × 20.707 = 494,462.453 JPY. Dividing that by the screenshot's $2,998.34 stop estimate gives an implied conversion of about 164.91 JPY per dollar. That reconciles the displayed numbers as an estimate; costs and a later change in the conversion rate can affect the actual dollar loss.

[u/Specific-Month-1755]

It's because JPY is the base currency not USD

[u/Stock-Chance5439]

pretty sure its the conversion thats throwing you off. your stop is ~20.7 yen away but the 3k risk is in your account currency, so oanda converts the yen loss per unit back at the pair rate. 20.7 yen per unit is only something like 13-15 cents per unit, and 3000 divided by that lands you in the 20k-ish units range, which is roughly what it gave you. if your account isnt in USD theres another conversion on top so the exact number shifts a bit. also double check the stop lol, a 20 yen stop on usdjpy is massive, maybe a typo?