OCI Resource Manager Calculator
Quantify the time Resource Manager saves over manual provisioning, including drift detection, and cost the difference.
About OCI Resource Manager Calculator
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
Worked example
With the default values below, OCI Resource Manager Calculator returns Monthly Saving of $16,328.60. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Stacks under managementaccepts 1–1,000 stacks
- 15 stacks
- Apply runs per stack each monthaccepts 0–500 runs
- 8 runs
- Manual effort per changeaccepts 1–2,000 minutes
- 90 minutes
- Effort per Resource Manager runaccepts 0–500 minutes
- 12 minutes
- Drift detection runs per stackaccepts 0–200 runs
- 4 runs
- Effort per drift checkaccepts 0–200 minutes
- 5 minutes
- Manual changes needing reworkaccepts 0–100 %
- 12 %
- Automated changes needing reworkaccepts 0–100 %
- 3 %
- Loaded engineer rateaccepts 0–1,000 USD/hour
- 95 USD/hour
- Resource Manager service chargeaccepts 0–100 USD/hour
- 0 USD/hour
Results
- 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
- Resource Manager Charge
- $0.00
- Annual Saving
- $195,943.20
Step by step
- 1Values used
- 2OCI Resource Manager
- 3Monthly Saving= 16,328.60
- 4Manual Effort per Month= 201.6 hours
- 5Automated Effort per Month= 29.7 hours
- 6Hours Saved per Month= 171.9 hours
- 7Effort Reduction= 85.3
- 8Drift Detection Effort= 5.0 hours
Assumptions and limits
- The result is derived only from the 10 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
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.