USDMXN lot size calculator
A standard USDMXN lot is 100,000 units, quoted to 5 decimals, and one pip of 0.0001 moves 10 MXN per lot. Feed the calculator your account size, the percentage you are willing to lose and the distance to your stop, and it returns the size that puts exactly that much at risk — rounded down to your broker's lot step so the real risk never comes out above the target.
What makes USDMXN different
The peso is an exotic, and exotics charge for it in the spread: a spread of 100 or 200 points is normal where a major charges 10. That cost has to sit inside your stop, not outside it. Rollover is the other thing to watch, since the rate differential between the dollar and the peso makes holding this pair overnight meaningfully expensive in one direction and profitable in the other.
Contract specification
| Symbol | USDMXN |
|---|---|
| Contract size (1 lot) | 100,000 |
| Quote currency | MXN |
| Quoted decimals | 5 |
| Pip / point size | 0.0001 |
| Pip value per standard lot | 10 MXN |
USDMXN pip value by lot size
Values in MXN, the currency USDMXN is quoted in. A pip here is 0.0001.
| Lot size | Units | Value of 1 pip |
|---|---|---|
| Standard (1.00) | 100,000 | 10 MXN |
| Mini (0.10) | 10,000 | 1 MXN |
| Micro (0.01) | 1,000 | 0.1 MXN |
A worked example
- Risk in money: a 10 000 MXN account risking 1% puts 100 MXN on the line.
- Stop distance in price: 200 pips × 0.0001 = 0.02.
- Loss per lot: 0.02 × 100,000 = 2,000 MXN.
- Lot size: 100 ÷ 2,000 = 0.05, rounded down to 0.05.
The example assumes an account in MXN. If yours is in another currency, every figure above gets multiplied by the rate from MXN to your currency, which the calculator applies automatically.
Lot size for a 10 000 MXN account
What each combination of risk and stop distance works out to. Read it as a sanity check on the number the calculator gives you.
| Risk | 100 pips | 200 pips | 400 pips | 800 pips |
|---|---|---|---|---|
| 0.5 % | 0.05 | 0.02 | 0.01 | — |
| 1 % | 0.1 | 0.05 | 0.02 | 0.01 |
| 2 % | 0.2 | 0.1 | 0.05 | 0.02 |
| 3 % | 0.3 | 0.15 | 0.07 | 0.03 |
Frequently asked questions
How much is one pip worth on USDMXN?
On a standard lot of 100,000 units, one pip of 0.0001 is worth 10 MXN. A mini lot is a tenth of that and a micro lot a hundredth. If your account is not in MXN, multiply by the current rate from MXN to your account currency.
What lot size should I use on USDMXN?
There is no single right size: it depends on how much you are willing to lose and where your stop sits. Decide the loss first — most traders cap it at 1% to 2% of the account per trade — then divide that amount by the loss per lot at your stop distance. The calculator above does exactly that and rounds down to your broker's step.
Why does my broker show a different USDMXN lot size?
Almost always because the contract or the pip definition differs. Open your platform's contract specification for USDMXN, compare the contract size against 100,000 and the tick against 0.0001, and correct them under "broker settings" above. The second cause is the conversion rate when your account currency is not MXN; you can override that too.
I have a dollar account — does that change the USDMXN calculation?
Yes. USDMXN settles in MXN, so the loss per lot has to be converted from MXN into dollars at the current rate. The calculator does it automatically and tells you which rate it used, and you can type your broker's own rate if you want the figure to match your platform to the cent.
Educational tool. Check the size in your platform before trading; leveraged trading carries a risk of loss.