The Swedish Genealogy Guide offers 2 Swedish English dictionaries for free to help your research, they are:
The Swedish Historical Dictionary Database, SHDD
The SHDD is a searchable database built upon the Swedish, German, French and English Dictionary by Sven Niclas Wahrman in 1814. As this is a multi-language dictionary, the translations tend to be short. To use this click on Swedish Historical Dictionary Database, SHDD.
The 1788 Swedish English Dictionary
This is a digital copy of the 1788 Swedish English Dictionary by Gustaf Widegren. This dictionary offers many examples to show how words were used in sentences. To use this click on 1788 Swedish English Dictionary.