JPY pairs: from stop price to account-currency risk

Follow a USD/JPY example from a 0.30 price difference to 30 pips, then check the conversion and lot size.

ATFC editorial · Published November 1, 2026 · Educational arithmetic

Identify the quote currency before counting

A JPY quote conventionally uses a 0.01 pip. For USD/JPY, a move of 0.30 is therefore 30 pips, not three and not 3,000. Platforms may show prices such as 150.200; the extra digit is a fractional pip. It does not change the conventional pip unit used by this calculator. The relevant condition is JPY as quote currency, rather than merely the appearance of a currency somewhere in a trade description.

Calculate the planned price distance

Consider a hypothetical long entry at 150.20 with a stop at 149.90. The absolute difference is 0.30 JPY per USD. Divide 0.30 by 0.01 to obtain 30 pips. For a short entry at 150.20, a stop at 150.50 has the same distance but sits on the opposite side. In price mode, choose the direction and ensure the stop is adverse to entry. A price distance is a scenario input, not a suggestion about where a stop belongs.

Derive the pip value in yen

Under a 100,000-base-unit contract, one USD/JPY lot represents 100,000 USD. Multiplying by 0.01 gives ¥1,000 per pip per lot. A 0.10 lot has ¥100 per pip, and a 0.01 lot has ¥10 per pip. This part of the calculation is in the quote currency, JPY. Treating ¥1,000 as $1,000 would overstate the dollar figure by the conversion factor.

Convert with an explicit scenario rate

Suppose the required conversion is 150 JPY per USD for this example. Divide ¥1,000 by 150 to obtain approximately $6.6667 per pip per lot. A 30-pip adverse move is then $200 per lot under that fixed conversion assumption. A $100 cash budget fits 0.50 lots before costs, and a 0.01-lot increment leaves that example size unchanged. A yen-denominated account would instead use the ¥1,000 pip value directly with a yen budget.

Reproduce the inputs in the tool

In Position size, choose USD/JPY and a USD account, then use a $10,000 balance and 1% illustrative budget. Enter 30 pips, or the long entry and stop prices above. To reproduce the exact $200-per-lot example, enable a custom conversion and enter 0.006666666666666667 USD for one JPY. Keep cost inputs at zero for this price-only example and use 100,000 base units per lot. Current daily reference rates will otherwise produce a different estimate.

Why a real result may differ

USD/JPY conversions can change between entry and exit, and the broker may apply a different conversion or charge. The fixed 150 example is a checkable approximation, not a current quote or an exact reconstruction of a closed trade. Costs and stop slippage can raise actual loss. Confirm the displayed source date, conversion direction, contract size and executable price basis rather than assuming a familiar dollar pip value from EUR/USD.

Sources and conventions

Examples are hypothetical. Arithmetic follows the formulas documented in our methodology. Broker contract specifications determine actual lot, margin and execution conditions. These sources document definitions and data; a source link does not imply endorsement of SanForex or a trading service.

These materials are prepared with AI assistance and checked against worked examples and deterministic calculation tests where applicable. They are not an expert suitability assessment or investment advice.

Open position size tool ↗