Quantity of rapid rise yeast vs regular yeast in bread machine
Google returned this link with the following conversion:

"...1 tsp Active Dry = 2/3 tsp Instant (100% Active Dry = 66% Instant)

1 tsp Instant = 1 1/2 tsp Active Dry (100% Instant = 150% Active Dry)

You can substitute one for the other in any recipe. Remember that active dry must be dissolved in a small amount of lukewarm water before you use it...."