Numbers versus Experience Points
Sure, the Cleric in Swords & Wizardry gets fewer Hit Dice than a Fighter, but the Cleric levels faster. So how does the actual Hit Dice over Experience Point vary? The below answer those and other questions. The X-axis is always experience points, plotted on a logarithmic scale.
The charts start with 1,000 instead of 0 to avoid having the useless 0 to 1,000 section take up a quarter of graph. To compensate, I moved the 1st level information to 1,000.
The charts were created in OpenOffice. The input data was calculated by custom software I wrote.