# Reserved Capacity Savings Calculator

> Compare reserved capacity with on-demand at the usage you expect.

Page: https://freecalculator.tech/tools/reserved-capacity-savings-calculator
Last reviewed: 2026-09-16

## Formula

On-demand cost = On-demand price × Hours × Instances × Coverage; Reserved cost = Upfront + Reserved price × Hours × Instances; Saving = On-demand cost − Reserved cost

- On-demand cost = On-demand price × Hours × Instances × Coverage; Reserved cost = Upfront + Reserved price × Hours × Instances; Saving = On-demand cost − Reserved cost.
- Inputs used: Currency, On-demand price per hour, Reserved price per hour, Upfront payment (optional), Hours in the term, Instances reserved, Share of those hours you actually use, Price as of (optional), and other shown inputs.
- Edge handling: On-demand price per hour is required.; On-demand price per hour cannot be negative.; On-demand price per hour must be no more than 1000000000.; Reserved price per hour is required.; Reserved price per hour cannot be negative..

## Inputs

- Currency
- On-demand price per hour
- Reserved price per hour
- Upfront payment (optional)
- Hours in the term
- Instances reserved
- Share of those hours you actually use
- Price as of (optional)
- Price source (optional)

## Worked example: Ten instances reserved for a year at full use

Both prices and the upfront payment are yours; no discount percentage is assumed.
1. Start with Currency: USD, On-demand price per hour: 0.192, Reserved price per hour: 0.121, Upfront payment (optional): 0, Hours in the term: 8760, Instances reserved: 10.
2. Apply the method: On-demand cost = On-demand price × Hours × Instances × Coverage; Reserved cost = Upfront + Reserved price × Hours × Instances; Saving = On-demand cost − Reserved cost.
3. Both prices and the upfront payment are yours; no discount percentage is assumed.

## Common questions

### Where does this formula come from?

FinOps Framework capability: rate optimisation — a commitment or reservation is evaluated by comparing what the same usage would cost at on-demand rates with what the commitment actually costs, including anything committed but unused. See the source link on this page.

### What kind of calculation is this?

What the hours actually used would cost at on-demand prices, less the full cost of the reservation including hours paid for but not used. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### What are its limits?

Compares two prices the user entered; it does not model changing the fleet during the term. The result is only as current as the prices entered; a price taken months ago is not a current vendor price. Arithmetic over the figures entered — it cannot tell whether the usage or the rate card behind them is right.

### How do I use the Reserved Capacity Savings Calculator?

Enter the required values for Currency, On-demand price per hour, Reserved price per hour, Upfront payment (optional), Hours in the term, and the other fields shown. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the Reserved Capacity Savings Calculator use?

On-demand cost = On-demand price × Hours × Instances × Coverage; Reserved cost = Upfront + Reserved price × Hours × Instances; Saving = On-demand cost − Reserved cost The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### Can the Reserved Capacity Savings Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this reserved capacity savings calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- The Linux Foundation — https://www.finops.org/framework/capabilities/rate-optimization/

## Cite this page

- APA: Free Calculator. (2026, September 16). Reserved Capacity Savings Calculator. https://freecalculator.tech/tools/reserved-capacity-savings-calculator
- MLA: "Reserved Capacity Savings Calculator." Free Calculator, 16 Sept. 2026, https://freecalculator.tech/tools/reserved-capacity-savings-calculator.
- Link: Reserved Capacity Savings Calculator — Free Calculator, https://freecalculator.tech/tools/reserved-capacity-savings-calculator