Mexican peso to US dollars, in your head
One rule, the error band that comes with it, and the point at which it stops being the right rule. Updated from the live rate feed.
Pesos to US dollars. Accurate to within 1.9% at today's rate, which means it reads about 1.9% dearer than the real price.
The ladder
The middle column is what the rule gives you standing in a market. The right column is the real number, so you can see exactly where the shortcut costs you.
| Mexican peso | Rule of thumb | Actual |
|---|---|---|
| $5 | $0.294 | $0.289 |
| $10 | $0.588 | $0.577 |
| $20 | $1.18 | $1.15 |
| $50 | $2.94 | $2.89 |
| $100 | $5.88 | $5.77 |
| $200 | $11.76 | $11.54 |
| $500 | $29.41 | $28.86 |
| $1,000 | $58.82 | $57.72 |
| $2,000 | $117.6 | $115.4 |
Going the other way
Useful at the ATM, where you choose an amount in US dollars and want to know what lands in your hand.
| US dollars | Mexican peso |
|---|---|
| $1 | $17.32 |
| $5 | $86.62 |
| $10 | $173.2 |
| $20 | $346.5 |
| $50 | $866.2 |
| $100 | $1,732 |
What catches people out in Mexico
Mexico uses the dollar sign for pesos, so a price written "$200" is pesos, not dollars. This single ambiguity causes more traveller confusion than any exchange rate.
When this rule stops working
Rules of thumb rot quietly. This one holds while the rate stays roughly between 16.5 and 17.5 MXN to the dollar. Outside that band a different divisor becomes the better one to memorise. We regenerate this page from the live rate feed, so the date above tells you how fresh the number is — if you are reading this a long way after August 2026, check it before you rely on it.
Or skip the arithmetic entirely
RoamRate does this conversion with no signal, in one hand, on a number pad built for a thumb. Free for USD; MXN and 150+ other currencies unlock for $4.99, once.
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