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Object Storage Savings Plan Calculator

The Object Storage Savings Plan Calculator compares a baseline pay-as-you-go storage cost with a discounted commitment-style rate and estimates whether the expected usage level produces worthwhile savings. It is intended for budgeting scenarios where a provider, reseller, or internal platform offers a lower unit price in exchange for committing to a minimum amount of storage.

The calculation separates the cost of the committed block from any usage above that block. Expected storage up to the commitment is priced at the discounted rate, while excess usage is priced at the regular rate. Because commitment programs differ widely, the tool does not assume a particular vendor contract, payment schedule, or refund rule. Instead, you provide the rates and commitment size directly. The output highlights projected plan cost, baseline cost, dollar savings, and the effective savings percentage for the usage level entered.

Plan assumptions

TB
TB
$ / TB-month
$ / TB-month
Result
—
Estimated monthly savings
Baseline cost—
Plan cost—
Savings rate—
Unused commitment—

1. Estimate expected storage
Enter the monthly storage volume you expect to use during the plan period.

2. Enter the commitment size
Provide the amount of storage that would be billed at the committed rate.

3. Add regular pricing
Enter the effective pay-as-you-go rate per TB-month for the same storage workload.

4. Add committed pricing
Enter the discounted rate applied to the committed storage block.

5. Compare the two costs
Review estimated savings along with unused commitment to see whether the commitment is sized appropriately.

Formula:
Baseline Cost = Expected Usage × Regular Rate
Plan Cost = Commitment × Committed Rate + max(Expected Usage − Commitment, 0) × Regular Rate
Savings = Baseline Cost − Plan Cost
Savings Rate = Savings ÷ Baseline Cost × 100

The model assumes the full committed quantity is billed at the committed rate even if expected usage is lower. Usage above the commitment is charged at the regular rate. Actual plans may apply different overage rates, prepayment terms, expiration rules, or eligible storage classes.

What the result means

The main result is the difference between the baseline monthly cost and the modeled committed-plan monthly cost.

A negative result means the modeled commitment costs more than regular pricing at the expected usage level.

Given: expected usage of 120 TB, a 100 TB commitment, a regular rate of $20 per TB-month, and a committed rate of $15 per TB-month.

Calculation: Baseline cost = 120 × $20 = $2,400. Plan cost = 100 × $15 + 20 × $20 = $1,900. Savings = $2,400 − $1,900 = $500. Savings rate = $500 ÷ $2,400 × 100 ≈ 20.83%.

Result: At this usage level, the modeled commitment saves about $500 per month compared with regular pricing.

Why can the savings be negative?

If the commitment is large relative to expected usage, paying for unused committed capacity can outweigh the unit-price discount. The negative value represents that modeled premium.

Should the regular and committed rates cover the same storage class?

Yes. For a meaningful comparison, both rates should represent comparable storage service, region, redundancy, and billing units.

How are overages priced?

This model prices usage above the commitment at the regular rate. If your contract has a different overage rate, use a regular-rate input that best reflects that expected marginal cost.

Does the calculator include upfront fees?

No separate upfront fee is modeled. If a commitment requires a one-time payment, convert it to an equivalent monthly amount or evaluate it separately.

What does unused commitment show?

It is the committed storage amount that exceeds expected usage. A large unused amount can signal that the commitment may be oversized for the scenario.