The pound was up 1.85 per cent to 1.342 dollars and up 1.09 per cent to 1.202 euros within minutes of the announcement - the highest level since June 2018.
The joint Sky/BBC/ITV poll gives the Tories 368 seats with Labour on 191, the SNP on 55 and LibDems 13. The Tory majority is projected to be 86.
The exit poll suggests the biggest majority for a Conservative government since 1987.
It followed a day of election jitters for values, complicated by a US-China trade war breakthrough that strengthened the dollar.