Pound sterling 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.
Pounds to Swiss francs. Accurate to within 1.1% at today's rate, which means it reads about 1.1% 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.
| Pound sterling | Rule of thumb | Actual |
|---|---|---|
| £0.5 | CHF 0.55 | CHF 0.544 |
| £1 | CHF 1.1 | CHF 1.09 |
| £2 | CHF 2.2 | CHF 2.18 |
| £5 | CHF 5.5 | CHF 5.44 |
| £10 | CHF 11 | CHF 10.88 |
| £20 | CHF 22 | CHF 21.77 |
| £50 | CHF 55 | CHF 54.42 |
| £100 | CHF 110 | CHF 108.8 |
| £200 | CHF 220 | CHF 217.7 |
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 | Pound sterling |
|---|---|
| CHF 1 | £0.919 |
| CHF 5 | £4.59 |
| CHF 10 | £9.19 |
| CHF 20 | £18.38 |
| CHF 50 | £45.94 |
| CHF 100 | £91.88 |
What catches people out in the UK
Sterling is the one major currency where the number on the tag is smaller than the dollar amount you will actually pay. Round up, not down.
When this rule stops working
Rules of thumb rot quietly. This one holds while the rate stays roughly between 0.889 and 0.93 GBP 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; GBP and 150+ other currencies unlock for $4.99, once.
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