sGTM Migration - Cost Estimate

Traffic & Compute

Monthly events

1.0B

Presets:

Transaction events / month

Avg response payload

Processing time / request

vCPUs per instance

Memory per instance

GiB

Infrastructure

Regions

Min instances / region

Global load balancer

Forwarding rules

Optional Services

Firestore lookups

Lookup scope

Reads per lookup

Cloud Armor WAF

Cloud Tasks (retries)

Pub/Sub (fan-out)

Log level

Expected failure rate

Unit Prices (editable)

All values verified against official GCP pricing, March 2026.

Cloud Run

Per 1M requests

Per vCPU-second

Per GiB-second

Free requests / month

Free vCPU-seconds / month

Free GiB-seconds / month

Networking

Egress per GB (Premium)

LB data processing / GB

LB forwarding rule / hour

Firestore

Per 100K reads

Cloud Tasks

Per 1M operations

Free operations / month

Pub/Sub

Per GB

Free GB / month

Cloud Logging

Per GiB ingestion

Free GiB / month

Cloud Armor

Per 1M WAF requests

Per policy / month

Per rule / month

Monthly Cost Breakdown

Estimated monthly spend based on current configuration

Service	Details	Monthly Cost
Cloud Run
Requests
Compute - CPU
Compute - Memory
Networking
Internet egress
LB data processing
LB forwarding rules
Firestore
Document reads
Reliability
Cloud Tasks (retries)
Pub/Sub
Observability
Cloud Logging
Security
Cloud Armor - WAF
Cloud Armor - Policies
Cloud Armor - Rules
Subtotal
TOTAL MONTHLY COST

Annual Estimate

Cost / 1M Events

Cost / Transaction

Verification & Assumptions

All unit prices verified against official GCP documentation, March 2026
Prices shown for Tier 1 (US) regions; other regions may differ
Network egress uses Premium Tier estimate (~$0.12/GB); actual rate is volume-tiered ($0.08–$0.23/GB)
Cloud Run free tier credits applied (negligible at this scale)
Compute modelled as per-request billing; always-allocated may be cheaper at sustained high traffic
Pub/Sub official rate is $40/TiB (~$0.039/GB); $0.04/GB is a standard rounded figure
Committed use discounts and sustained use discounts are not applied