Frequently Asked Questions

How accurate are the mental math approximations?

Our mental math formulas are designed to be within 1-5% of the actual exchange rate, which is accurate enough for quick shopping decisions.

How often are exchange rates updated?

Exchange rates are updated daily via automated processes to ensure you have current information.

Can I use this offline?

The current version requires an internet connection, but we’re working on offline capabilities.

Which currencies are supported?

Currently we support USD, EUR, GBP, and JPY. We’re planning to add more currencies based on user demand.

Why use mental math instead of a calculator?

Mental math approximations are:

• Faster - No need to pull out your phone
• Convenient - Works anywhere, anytime
• Memorable - Once you learn the trick, you’ll always have it
• Good enough - For shopping decisions, you don’t need exact precision

Can I suggest a currency pair?

Absolutely! We’re always looking to expand our currency coverage based on user needs.

Are there different mental math tricks for different currency pairs?

Yes! Each currency pair has its own optimized mental math formula designed to be as simple as possible while maintaining good accuracy.