What Decimal Odds Mean Mathematically — A Complete Guide

Understanding Decimal Odds

Decimal odds are the most common format used by Kenyan bookmakers like SportPesa and Betika. They represent the total return per unit staked, including your original stake.

The Basic Formula

Total Payout = Stake × Decimal Odds

Profit = Stake × (Decimal Odds − 1)

Examples

OddsKES 1,000 StakePayoutProfit |------|-----------------|--------|--------| 1.50KES 1,000KES 1,500KES 500 2.00KES 1,000KES 2,000KES 1,000 5.00KES 1,000KES 5,000KES 4,000 10.00KES 1,000KES 10,000KES 9,000

Implied Probability

Decimal odds encode the bookmaker's implied probability of an outcome:

Implied Probability = 1 ÷ Decimal Odds × 100%

For example, odds of 2.50 imply a 40% probability (1 ÷ 2.50 = 0.40 = 40%).

Favourites vs Underdogs

Odds < 2.00: The bookmaker considers this outcome more likely than not (implied probability > 50%) — these are favourites

Odds = 2.00: Evens — the bookmaker implies a 50% probability

Odds > 2.00: The bookmaker considers this outcome less likely than not — these are underdogs

Use our Odds Calculator to convert between decimal, fractional, and American formats instantly.