What these formats mean
Decimal odds (used across Europe, including by Swedish-licensed bookmakers) show your total return per unit staked, including the stake back. Odds of 2.30 return 2.30 for every 1 staked.
American odds show how much you'd win on a 100 stake (a plus sign) or how much you'd need to stake to win 100 (a minus sign). +130 wins 130 on a 100 stake; -200 needs 200 staked to win 100.
Fractional odds (traditional in the UK) show profit relative to stake as a fraction. 13/10 means a profit of 13 for every 10 staked, on top of the stake back.
What is implied probability?
Implied probability is what a price says the chance of that outcome is, if you take the odds at face value: 1 divided by the decimal odds, as a percentage. Odds of 2.30 imply a 43.5% chance.
Every bookmaker builds a margin into its odds, so the implied probabilities of all outcomes in a market add up to more than 100%. The extra is the bookmaker's edge, not a real reflection of the true chance.
Why this isn't the same as fair odds
This page converts a price between formats and shows what it implies at face value. It doesn't say whether that price is good value, because it doesn't remove the bookmaker's margin or compare it against a sharp reference line.
For that, use the EV calculator: it removes Pinnacle's margin to estimate the true, fair probability, and compares it against the price you can actually get.