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Convert any currency in your head

One rule per currency. How wrong it is. When it breaks. 219 sheets, regenerated from the live rate feed.

The fastest currency converter is not an app. It is a single division you already know, applied to a price before you have finished hearing it. It works with a dead battery, in a queue, mid-conversation, and it takes about five minutes to learn per country.

Every sheet below gives you four things: the rule, how far off the rule is at today's rate, a ladder of common amounts so you can check yourself, and the point at which the rate has moved enough that you should memorise a different rule. The method behind all of them is worth reading once.

WHY THESE ARE DATED

A rule of thumb rots. Every sheet carries the date of the rate it was built from and the band within which it stays true, because a conversion rule with no date on it is how people end up confidently wrong two years later.

South & Southeast Asia

Europe

Middle East & Africa

The Americas & Oceania

For the times an approximation is not good enough

RoamRate converts exactly, offline, in one hand. Free for five major currencies; $4.99 once for all 150+.

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