USD/JPY is the pair where most lot-size mistakes happen, for one reason: the pip value is not $10. Because the quote currency is yen, a pip is worth 1,000 yen per lot, and its dollar value changes with the exchange rate. This calculator uses a pip value of about $6.70 per lot — correct when USD/JPY trades near 150 — and the notes below show how to recompute it when the rate moves.
USD/JPY contract facts
| Item | Value |
|---|---|
| Standard lot | 100,000 USD |
| Pip | 0.01 (2nd decimal; brokers quote a 3rd "pipette") |
| Pip value, 1 lot | ¥1,000, which is 1,000 ÷ USD/JPY rate in dollars |
| Pip value at 140 / 150 / 160 | $7.14 / $6.67 / $6.25 |
| Pip value, 0.10 lot at 150 | $0.67 |
| Typical spread | 0.1–1.0 pip on ECN accounts |
| Typical daily range | roughly 70–110 pips; larger around BoJ and Fed events |
| Most liquid hours | Tokyo session and the London–New York overlap |
The higher USD/JPY goes, the less each pip is worth in dollars. That works in your favour when sizing a short at 160 and against you when sizing at 130 with a value memorised from 150.
Computing the pip value yourself
Pip value per lot (USD) = 1,000 ÷ USD/JPY rateAt 152.40: 1,000 ÷ 152.40 = $6.56. At 147.80: $6.77. The calculator on this page uses $6.70; if the rate is more than a few big figures from 150, substitute the exact value in the formula below or use the full calculator, which pulls the live rate.
The lot size formula for USD/JPY
Lot size = (Account balance × Risk %) ÷ (Stop loss in pips × Pip value per lot)Example 1 — $10,000 account, 1% risk, 25-pip stop, rate 150:
- Risk amount: $100
- Loss per lot: 25 × $6.67 = $166.75
- Lot size: $100 ÷ $166.75 = 0.60 lots
Example 2 — $5,000 account, 1% risk, 40-pip stop, rate 140:
- Pip value: 1,000 ÷ 140 = $7.14
- Loss per lot: 40 × $7.14 = $285.60
- Lot size: 0.18 lots
Example 3 — $100,000 prop-firm account, 0.5% risk, 30-pip stop, rate 150:
- Risk amount: $500
- Loss per lot: 30 × $6.67 = $200
- Lot size: 2.50 lots
Quick reference: USD/JPY lot size at 1% risk (rate ≈ 150)
| Account | 15-pip stop | 25-pip stop | 40-pip stop | 60-pip stop |
|---|---|---|---|---|
| $1,000 | 0.10 | 0.06 | 0.04 | 0.02 |
| $5,000 | 0.50 | 0.30 | 0.19 | 0.12 |
| $10,000 | 1.00 | 0.60 | 0.37 | 0.25 |
| $50,000 | 5.00 | 3.00 | 1.87 | 1.25 |
| $100,000 | 10.00 | 6.00 | 3.75 | 2.50 |
Halve for 0.5% risk; double for 2%. At a rate of 140, reduce every figure by about 7%; at 160, increase by about 7%.
What makes USD/JPY different
- The pip is at the second decimal. 150.00 → 150.25 is 25 pips, not 250. Traders coming from EUR/USD often misread the quote by a factor of ten.
- Bank of Japan intervention. The BoJ has intervened directly when the yen weakens fast, producing 300–500-pip moves in minutes. Stops are filled far past their level in those windows.
- Rate differentials drive the trend. The pair moves on the gap between Fed and BoJ policy, so Fed decisions, US CPI and BoJ meetings are the events that matter; Japanese data alone rarely moves it much.
- Tokyo session is real liquidity. Unlike most pairs, USD/JPY has a deep Asian session. Spreads are tight from Tokyo open, which suits traders in that time zone.
- Swap matters for holders. With a wide rate gap, long USD/JPY earns a positive swap and short pays a negative one. It changes the maths on multi-day positions.
Common USD/JPY sizing mistakes
- Using $10 per pip. That overstates the loss by about 50% at 150 — you end up trading two-thirds of the size you could, or, if you compensate by instinct, more than you should.
- Memorising a pip value. $6.67 at 150 is $7.69 at 130. Recompute when the rate moves.
- Tight stops through BoJ windows. Any stop inside 100 pips is exposed when intervention risk is live.
- Counting pips at the third decimal. A 0.005 move is half a pip, not 5.
Track your USD/JPY trades in Fips
Fips's free trading journal records every trade with its pip result and R-multiple, and the full lot size calculator pulls the live rate so the pip value is always current. Connect an MT4, MT5 or cTrader account and trades import automatically. Backtest a USD/JPY setup to see how it behaved through past intervention episodes, and use the economic calendar to keep Fed and BoJ dates in view.
Frequently asked questions
How much is 1 pip on USD/JPY?
¥1,000 per standard lot, which is 1,000 divided by the current rate in dollars — about $6.67 at 150, $7.14 at 140, $6.25 at 160.
Why is the USD/JPY pip value different from EUR/USD?
Because the quote currency is yen. A pip on any pair is worth a fixed amount of the quote currency; on EUR/USD that is $10, on USD/JPY it is ¥1,000, which has to be converted to dollars.
What lot size should I use on a $10,000 USD/JPY account?
At 1% risk and a 25-pip stop with the rate near 150, 0.60 lots. At a 50-pip stop, 0.30 lots.
Does the calculator on this page use the live rate?
It uses a fixed $6.70 per pip per lot, which is accurate near 150. The full calculator linked below uses the live rate.