SendGrid Pricing

We use SendGrid to send thousands of E-mails per day, and they make it easy.  Our bill has steadily increased.  Our question, was: "Given SendGrid's pricing, when do we need to upgrade?"  By the way, SendGrid does have a simple calculator on their "Product Pricing" page.  The table below should help you answer that question.

	$ / Month	# of Credits	Marginal $	Breakeven Point
Basic	9.95	10000	0.00100	170000
Silver	79.95	50000	0.00075	430000
Gold	199.95	100000	0.00050	500000
Platinum	399.95	500000	0.00045