Mexican peso to Swiss francs, 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 Swiss francs. 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 |
|---|---|---|
| $10 | CHF 0.476 | CHF 0.467 |
| $20 | CHF 0.952 | CHF 0.935 |
| $50 | CHF 2.38 | CHF 2.34 |
| $100 | CHF 4.76 | CHF 4.67 |
| $200 | CHF 9.52 | CHF 9.35 |
| $500 | CHF 23.81 | CHF 23.37 |
| $1,000 | CHF 47.62 | CHF 46.75 |
| $2,000 | CHF 95.24 | CHF 93.5 |
| $5,000 | CHF 238.1 | CHF 233.7 |
Going the other way
Useful at the ATM, where you choose an amount in Swiss francs and want to know what lands in your hand.
| Swiss francs | Mexican peso |
|---|---|
| CHF 1 | $21.39 |
| CHF 5 | $107 |
| CHF 10 | $213.9 |
| CHF 20 | $427.8 |
| CHF 50 | $1,070 |
| CHF 100 | $2,139 |
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 20.5 and 21.5 MXN to the franc. 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 CHF; MXN and 150+ other currencies unlock for $4.99, once.
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