How many points are needed to make a quantitative bid in response to a one no trump bid?

Raising a notrump bid to 4NT is a natural invitation to slam, called Quantitative 4NT, or just "quant". Quant bids after a 1NT opening are more or less a math problem, keeping in mind that roughly 33 HCP are needed to be in small slam with two balanced hands.

eg: Responding to 1NT (15-17 HCP)

9-15 HCP--bid to game

16-17 HCP--invite slam with a Quantitative 4NT response.Opener passes with a minimum.

18-19--bid to slam