A currency strength ranking tells you which currency is winning overall. A heat map answers a different, more specific question: exactly how much did this particular pair move, and how does that compare to every other pair at a glance? It's the pairwise detail behind the aggregate ranking.
What the grid actually shows
A forex heat map is a grid of every major currency against every other one, where each cell is the percentage change for that specific pair over your selected timeframe:
% change = (current rate − past rate) ÷ past rate × 100
Color does the rest of the work: cells shade green for a gain and red for a loss, with the intensity of the color scaling with the size of the move — a pair that moved 2% looks visually louder than one that moved 0.2%, so the biggest movers are immediately obvious without reading every individual number.
Why color intensity is capped
Color scales don't work well left uncapped — one outlier move (say, a currency spiking 8% on a surprise rate decision) would wash out every other cell into pale, indistinguishable near-white, making the whole grid less readable rather than more. Capping the intensity at a fixed ceiling (PipDesk's heat map caps at 2.5%) means the color scale stays meaningful across normal market conditions — a 2% move and a 5% move both read as "deeply colored, notably large," rather than the 5% move making everything else invisible by comparison.
Reading it for trade ideas
Two things are worth scanning for specifically:
- Outlier cells — a pair that's noticeably more colored than the rest of its row or column is moving independently of the broader pattern, which is often worth understanding before trading it (news event, data release, or a genuine break from correlation).
- Row and column patterns — if one currency's entire row is consistently green (or consistently red), that's the same signal a strength ranking gives you, just visible directly in the grid: broad strength or weakness against everything, not just one counterpart.
The biggest gainer and biggest loser pairs are usually worth a first look — they represent the largest directional moves currently on the board, which is either the most interesting trading opportunity or the most crowded one, depending on how far into the move you're looking.
Heat map vs. strength meter — when to use which
They're built from the same underlying exchange-rate data, viewed two different ways. The Currency Strength Meter answers "which single currency is strongest right now" — a ranked list, good for picking which currency to focus on. The heat map answers "how did this specific pair move" — a full grid, good for scanning everything at once or checking one specific pair against several others simultaneously. Many traders check the strength ranking first to pick a currency, then the heat map to see exactly which pairing of that currency produced the cleanest move.
See it live
PipDesk's Forex Heat Map runs on the same live ECB-sourced exchange rates, updated once per ECB business day, across 24h/1-week/1-month timeframes.