Look at EUR/USD alone and you can't tell whether the move you're seeing is the euro getting stronger, the dollar getting weaker, or both at once. A currency strength meter answers that question directly — it isolates each currency's own performance from the pair it happens to be quoted against.
How currency strength is actually calculated
The core idea: take one currency, compare it against every other major currency in a basket, and average the result. Specifically, for each currency the calculation is the average log-return against the other seven majors (EUR, USD, GBP, JPY, AUD, CAD, CHF, NZD):
Strength score = average of log(current rate ÷ past rate) across all other majors, × 100
A log-return (rather than a simple percentage change) is used because it treats a move up and the equivalent move down symmetrically, and because averaging log-returns across multiple pairs is mathematically consistent in a way that averaging raw percentages isn't. In practice, you don't need to compute this by hand — but understanding what's underneath the number matters for trusting it.
Reading the ranking
The output is a ranked list, strongest to weakest, over whatever timeframe you select (24 hours, 1 week, or 1 month). A currency near the top has been gaining broadly against most of the other majors, not just one pair — which is a meaningfully different signal than "EUR/USD went up," since that could just mean USD weakness rather than genuine EUR strength.
The practical use: pairing the strongest currency against the weakest currency tends to produce a cleaner, more directional move than a pair sitting in the middle of the ranking, since you're combining two currencies both moving the same direction relative to everything else rather than fighting each other or moving on unrelated news.
Timeframe changes the answer
A currency can be the strongest performer over the past 24 hours and the weakest over the past month — strength is relative to a specific window, not a fixed property of the currency. Short timeframes pick up recent momentum and news reactions; longer timeframes smooth that out and reflect a broader trend. Which one matters depends on your own trading horizon — a scalper and a swing trader watching the same currency can reasonably reach opposite conclusions about which one is "strong" right now, and both can be right for their own timeframe.
What it doesn't tell you
Strength ranking is a relative measure, not a trade signal on its own — it says nothing about entry timing, support/resistance, or upcoming news that could reverse the trend. It's also backward-looking by definition (calculated from rate changes that already happened), so it describes what has been moving, not a prediction of what moves next. Most traders use it as a filter — narrowing down which pairs deserve a closer look — rather than a standalone signal to trade off directly.
See it live
PipDesk's Currency Strength Meter runs this calculation on live ECB-sourced exchange rates across all eight major currencies, updated once per ECB business day. For the pairwise view of the same underlying data — seeing exactly how much each pair moved against every other pair — the Forex Heat Map covers that angle.