OCI Resource Manager Calculator
Quantify the time Resource Manager saves over manual provisioning, including drift detection, and cost the difference.
Inputs
Review time for the plan output, not the machine time to apply it.
Hand-built changes that have to be redone or rolled back.
Resource Manager itself has no charge; you pay only for the resources a stack provisions.
Monthly Saving
$16,328.60
Manual Effort per Month
201.6hours
Automated Effort per Month
29.7hours
Hours Saved per Month
171.9hours
Effort Reduction
85.3%
Drift Detection Effort
5.0hours
Resource Manager Charge
$0.00
Annual Saving
$195,943.20
Step by step
Values used
Stacks under management = 15 stacks; Apply runs per stack each month = 8 runs; Manual effort per change = 90 minutes; Effort per Resource Manager run = 12 minutes; Drift detection runs per stack = 4 runs; Effort per drift check = 5 minutes; Manual changes needing rework = 12 %; Automated changes needing rework = 3 %; Loaded engineer rate = 95 USD/hour; Resource Manager service charge = 0 USD/hour
OCI Resource Manager
manual hours = runs × manual minutes × (1 + manual rework %) ÷ 60; automated hours = runs × run minutes × (1 + automated rework %) ÷ 60 + drift-check hours; saving = (manual − automated) × engineer rate.
Monthly Saving
= 16,328.60
Manual Effort per Month
= 201.6 hours
Automated Effort per Month
= 29.7 hours
Hours Saved per Month
= 171.9 hours
Effort Reduction
= 85.3
Drift Detection Effort
= 5.0 hours
How it works
The saving is the difference between two effort models, each inflated by its own rework rate, because the real benefit of a Terraform stack is not the apply itself but the changes you do not have to redo. Drift detection is charged against the automated side as an honest overhead — it is work that manual provisioning simply never does. Resource Manager carries no service charge, so the business case is entirely about engineer hours and error rates, and quantifying the rework rate is what makes the argument credible. You still pay full price for whatever the stack provisions, which is why the resources themselves belong in the compute and storage calculators.
Formula
OCI Resource Manager
manual hours = runs × manual minutes × (1 + manual rework %) ÷ 60; automated hours = runs × run minutes × (1 + automated rework %) ÷ 60 + drift-check hours; saving = (manual − automated) × engineer rate.
- runs
- Stacks multiplied by apply runs per stack each month
- rework %
- Share of changes that have to be redone, which multiplies the effort
- drift-check hours
- Time spent reviewing drift detection output, an overhead automation adds
Frequently Asked Questions
How is OCI Resource Manager calculated?
manual hours = runs × manual minutes × (1 + manual rework %) ÷ 60; automated hours = runs × run minutes × (1 + automated rework %) ÷ 60 + drift-check hours; saving = (manual − automated) × engineer rate. The saving is the difference between two effort models, each inflated by its own rework rate, because the real benefit of a Terraform stack is not the apply itself but the changes you do not have to redo. Drift detection is charged against the automated side as an honest overhead — it is work that manual provisioning simply never does.
Why does OCI Resource Manager matter?
Resource Manager carries no service charge, so the business case is entirely about engineer hours and error rates, and quantifying the rework rate is what makes the argument credible. You still pay full price for whatever the stack provisions, which is why the resources themselves belong in the compute and storage calculators.
What values do I need to enter?
This calculator takes 10 inputs: Stacks under management, Apply runs per stack each month, Manual effort per change, Effort per Resource Manager run, Drift detection runs per stack, Effort per drift check, Manual changes needing rework, Automated changes needing rework, Loaded engineer rate, Resource Manager service charge. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.