How to read the chart
The grid has the 169 different starting hands in Texas Hold'em. Pairs are on the diagonal, from AA in the top corner down to 22. Above the diagonal are suited hands (marked "s", like AKs) and below it offsuit hands ("o", like AKo). Each suited hand has 4 combinations, each offsuit hand 12 and each pair 6, for 1,326 in total.
The colors show the earliest position you can open with a raise at a six-handed table when nobody has entered the pot yet. Pick a position at the top to see only its range and how much of all hands it plays. Click a hand to see its chance against a random hand and open it in the poker calculator.
Why the range grows toward the button
The earlier you act, the more players are still to act behind you, and the more likely one of them holds a better hand. Early positions (UTG and HJ) open only about 11% to 16% of hands. On the button just the two blinds are left, and you will act last for the whole hand, so you can open more than 40%. The guide on position explains why.
The small blind opens a little less than the button even with only one player left, because it will be out of position for the rest of the hand.
A starting point, not a rule
These ranges are a simplified starting point for opening when nobody has raised before you. When someone has already raised, play tighter: hands like AJo or KQo lose a lot of value against a raise. Against players who fold too much, open more; against players who call everything, open less and bet your good hands. The guide on starting hands covers these adjustments.