Stronger Chinese trade figures and the shelving of another US debt limit battle also helped to shore up markets, which appear to be getting over the recent turmoil that was prompted by uncertainties over emerging economies.
Gains in Europe accelerated by midday, tracking the overnight rise recorded in Asia after Janet Yellen's remarks yesterday.
Though Yellen indicated that she would continue with the reduction in the Fed's stimulus, she stressed that interest rates would remain at low levels for many more months at least. That message was similarly reiterated by Bank of England Governor Mark Carney.
Britain's FTSE 100 added 0.4 per cent to 6,698.22 and France's CAC 40 rose 0.5 per cent to 4,304.91. Germany's DAX climbed 1 per cent to 9,568.42.
Futures augured a higher open on Wall Street, with Dow and S&P futures both up 0.1 per cent.
The dollar has been broadly steady in the of Yellen's remarks. The euro was down 0.4 per cent at USD 1.3579 while the dollar fell 0.2 per cent to 102.26 yen.
Elsewhere, Japan's Nikkei 225 gained 0.6 per cent to finish at 14,800.06. Japanese markets were closed yesterday for a national holiday. Hong Kong's Hang Seng surged 1.5 per cent to 22,285.79 and South Korea's Kospi added 0.2 per cent to 1,935.84.
