Azure DNS Calculator

zone cost = min(zones, 25) × first-25 price + zones above 25 × reduced price, applied separately to public and private zones; query cost = first band × band price + overage × reduced price. Azure DNS charges a small monthly fee per hosted zone, discounted after the first 25, plus a per-million-query fee that drops once you pass the first volume band. Private DNS zones are priced on the same scale but counted separately, which matters when a hub-and-spoke design creates one private zone per service for private endpoints.

Private endpoint architectures quietly create dozens of private DNS zones, and while each is inexpensive the query volume from every VM resolving through them is not — the queries-per-second figure is also a useful sanity check against the resolver limits on your VNet.

This calculator takes 8 inputs: Public DNS zones, Private DNS zones, Price per zone, first 25, Price per zone beyond 25, DNS queries, Price per million queries, first band, First band size, Price per million beyond the band. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.