Currency Strength Chart shows the relative strength chart of the US dollar (USD), Euro (EUR), Japanese yen (JPY), Pound sterling (GBP), Australian dollar (AUD), Swiss Franc (CHF), Canadian dollar (CAD), New Zealand dollar (NZD) which are the major currencies of the foreign exchange market. You can quickly understand the sole strength of the currency which might be difficult to understand from currency pair fluctuation such as EURUSD and USDJPY.

How to read the chart

The chart shows the change of the price of a day, starting from the price of 22:00 UTC (The daylight-saving time period in the U.S. is 21:00 UTC) when the New York market closes. The higher it goes on the vertical line, the more the currency would be bought, and the lower on the line, the more it would be sold. The strength should be relative, so the sum total of the currency's value would always be zero at any time.

Calculation method of currency strength

//Rate of change
function GetVal($v1, $v2)
  if ($v2 == 0) {
  return log($v1/$v2)*10000;

function GetValM($v1, $v2, $v3, $v4)
  $v1 = $v1 * $v3;
  $v2 = $v2 * $v4;
  if ($v2 == 0) {
  return log($v1/$v2)*10000;

function GetValD($v1, $v2, $v3, $v4)
  if ($v3 == 0 || $v4 == 0) {

  $v1 = $v1 / $v3;
  $v2 = $v2 / $v4;
  if ($v2 == 0) {
  return log($v1/$v2)*10000;

//$v1 is the price of the starting point, $v2 is the current price
$EURUSD = GetVal($v1['EURUSD'],$v2['EURUSD']);
$USDJPY = GetVal($v1['USDJPY'],$v2['USDJPY']);
$USDCHF = GetVal($v1['USDCHF'],$v2['USDCHF']);
$GBPUSD = GetVal($v1['GBPUSD'],$v2['GBPUSD']);
$AUDUSD = GetVal($v1['AUDUSD'],$v2['AUDUSD']);
$USDCAD = GetVal($v1['USDCAD'],$v2['USDCAD']);
$NZDUSD = GetVal($v1['NZDUSD'],$v2['NZDUSD']);
$EURJPY = GetValM($v1['EURUSD'],$v2['EURUSD'],$v1['USDJPY'],$v2['USDJPY']);
$EURCHF = GetValM($v1['EURUSD'],$v2['EURUSD'],$v1['USDCHF'],$v2['USDCHF']);
$EURGBP = GetValD($v1['EURUSD'],$v2['EURUSD'],$v1['GBPUSD'],$v2['GBPUSD']);
$CHFJPY = GetValD($v1['USDJPY'],$v2['USDJPY'],$v1['USDCHF'],$v2['USDCHF']);
$GBPCHF = GetValM($v1['GBPUSD'],$v2['GBPUSD'],$v1['USDCHF'],$v2['USDCHF']);
$GBPJPY = GetValM($v1['GBPUSD'],$v2['GBPUSD'],$v1['USDJPY'],$v2['USDJPY']);
$AUDCHF = GetValM($v1['AUDUSD'],$v2['AUDUSD'],$v1['USDCHF'],$v2['USDCHF']);
$AUDJPY = GetValM($v1['AUDUSD'],$v2['AUDUSD'],$v1['USDJPY'],$v2['USDJPY']);
$AUDCAD = GetValM($v1['AUDUSD'],$v2['AUDUSD'],$v1['USDCAD'],$v2['USDCAD']);
$EURCAD = GetValM($v1['EURUSD'],$v2['EURUSD'],$v1['USDCAD'],$v2['USDCAD']);
$GBPCAD = GetValM($v1['GBPUSD'],$v2['GBPUSD'],$v1['USDCAD'],$v2['USDCAD']);
$GBPAUD = GetValD($v1['GBPUSD'],$v2['GBPUSD'],$v1['AUDUSD'],$v2['AUDUSD']);
$EURAUD = GetValD($v1['EURUSD'],$v2['EURUSD'],$v1['AUDUSD'],$v2['AUDUSD']);
$CADCHF = GetValD($v1['USDCHF'],$v2['USDCHF'],$v1['USDCAD'],$v2['USDCAD']);
$CADJPY = GetValD($v1['USDJPY'],$v2['USDJPY'],$v1['USDCAD'],$v2['USDCAD']);
$AUDNZD = GetValD($v1['AUDUSD'],$v2['AUDUSD'],$v1['NZDUSD'],$v2['NZDUSD']);
$EURNZD = GetValD($v1['EURUSD'],$v2['EURUSD'],$v1['NZDUSD'],$v2['NZDUSD']);
$GBPNZD = GetValD($v1['GBPUSD'],$v2['GBPUSD'],$v1['NZDUSD'],$v2['NZDUSD']);
$NZDCAD = GetValM($v1['NZDUSD'],$v2['NZDUSD'],$v1['USDCAD'],$v2['USDCAD']);
$NZDCHF = GetValM($v1['NZDUSD'],$v2['NZDUSD'],$v1['USDCHF'],$v2['USDCHF']);
$NZDJPY = GetValM($v1['NZDUSD'],$v2['NZDUSD'],$v1['USDJPY'],$v2['USDJPY']);

//Calculate the value of each currency
$Pairs = 7;


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