Money arrives in the inbox first
The supplier's quote in euros. The contractor's invoice in dollars. The venue's price list in yen. Foreign-currency numbers reach you by email before they reach any spreadsheet – and the very first question ("what is that in our currency, roughly?") gets asked right there, in Gmail, where there is nothing to answer it.
What people actually do, step by step
Copy the amount. Open a new tab. Type the conversion into a search engine. Read the number. Switch back. Forget it by the third line item, repeat. Or, for the diligent: open Sheets, write =GOOGLEFINANCE("CURRENCY:EURUSD"), multiply – a real answer, in a different app, for a question that lives in this one. Neither is a scandal; both are friction on a task you do more often than you think, and the friction has a quiet cost: the check gets skipped, and a mis-remembered rate rides into a reply.
Why Gmail specifically has no native answer
Sheets at least has GOOGLEFINANCE. Gmail – like Docs, Slides and Calendar – has no formula engine at all, so there is nothing to type a conversion into and no add-in surface Google fills itself. The inbox is the one place in Workspace where currency questions are most frequent and least answerable natively. When a formula is enough draws the line between the two.
The sidebar answer
Currency Converter puts conversion in a Workspace sidebar that opens inside Gmail: read the amount in the message, convert it in the sidebar – live rates for 180+ currencies, no tab, no copy-paste. And because it is one add-on across Gmail, Docs, Calendar, Slides and Sheets, the same tool follows the number from the email where it arrived to the quote where it ends up. Sidebar conversions are unlimited and free, no sign-up.
Two moments where it earns its place: sanity-checking a price before you reply "that works for us" to a number you converted in your head, and getting a rough figure for a quote in the minute before you forward it. For the rate on an invoice's own date rather than today's, the add-on's historical lookup lives in its Sheets formula (a Premium feature) – see historical exchange rates in Google Sheets.
Sources
- GOOGLEFINANCE – Google Docs Editors Help – read 2026-09-16 (for the Sheets contrast)
- Currency Converter by 8apps and its documentation – 180+ currencies, five apps, unlimited free sidebar, historical rates via the Sheets formula – read 2026-09-16