Air compressor free air delivery corrected to ISO 1217 conditions, specific power in kW per m3/min and kW per 100 cfm, isothermal, adiabatic and volumetric efficiency, load / unload vs modulation vs variable speed, annual cost, heat recovery and the value of a lower discharge pressure.
USD 39 one-time purchase
Download the sample report (PDF)
Need it once? Use it online: check your data free, unlock results from USD 9 for 3 runs.
What it does
Free air delivery
Corrected to ISO 1217, 1.01325 bar a at 15 °C or 0 °C, or your own reference, from intake, line or reference-state flow.
Specific power
kW per m³/min and kW per 100 cfm, on package input power, plus shaft power from motor and drive efficiency.
Isothermal, adiabatic and volumetric efficiency
On shaft and input power, with the isentropic exponent of the humid air.
Control modes compared
Load/unload, inlet modulation and variable speed: power at zero flow and average load, annual energy and cost.
Heat recovery
Heat rejected, recoverable and actually used, with MWh per year and the fuel displaced.
Discharge pressure what-if
Power, specific power and energy saved for four pressure reductions, with Design, Actual and Proposed columns.
Built for engineers
- Visible formulas — nothing hidden, so you can check every step.
- Fully referenced — methods from the standard references, checked against their published worked examples.
- Safe to share — sheets are protected against accidental edits, with an open password so you can still customise.
- Built-in input checks — clear warnings for impossible inputs and values outside typical ranges.
For engineering estimates; verify against site data. Code-based methods are aligned with the publicly documented procedure; they are not a licensed reproduction or a certification.
Preview the workbook
Real pages from the workbook with its built-in example loaded (example data, not a measured plant). Choose a page below, or select the large image to enlarge it.
Specification and checks
| Format | Excel workbook (.xlsx), no macros |
| Version | v1.0 |
| Works in | Excel 2010 or later, Windows and Mac |
| Units | SI, US and British, mixed freely |
| Includes | Guide tab with method and references, calculator, print-ready report |
| Checked against | About 375 recalculated runs against an independent Python model: all 324 selector combinations, SI, US, British and every-option unit sets and 31 edge cases; about 39,000 values compared, largest deviation 0.00001 %. |
| Free version | Try the free compressor power calculator |
Online tool or Excel workbook?
| Online tool | Excel workbook (this page) | |
|---|---|---|
| What it does | The same sheet as the Excel workbook, run in your browser | Air compressor free air delivery corrected to ISO 1217 conditions, specific power in kW per m3/min and kW per 100 cfm, isothermal, adiabatic and volumetric efficiency, load / unload vs modulation vs variable speed, annual cost, heat recovery and the value of a lower discharge pressure. |
| Cost | Check your inputs free. Results: 3 runs for USD 9, or every online tool for USD 15 a month (USD 99 a year) | USD 39 once, yours to keep |
| Input checks and findings | Every input checked; findings with the unlocked results | Every input checked, with findings and recommendations |
| Report for your calculation file | Printable results sheet | Print-ready report with your plant, tag, document number, revision and sign-off |
| Formulas | Method described in the guide | Every formula visible in its cell |
| Save, edit and rerun your cases | Each run separately | Yes: keep and edit your own file |
| Works offline, on a plant PC | No, needs the internet | Yes: Excel 2010 or later, Windows and Mac |
Online access and the Excel workbook are separate licences: one does not include the other.
Compatibility, licence and support
| File | Excel workbook (.xlsx), no macros, version v1.0; works in Excel 2010 or later on Windows and Mac. Sheets are protected against accidental edits, with an open password so you can customise. |
| Licence | Single user. A team licence (up to 5 named users) is 3 × the shop price; site licences on request — licence terms. |
| Updates | Updates to this major version are included; download them again from the link in your receipt. |
| Support | Email [email protected] with your order number — questions on the method, your inputs or your results are welcome. |
| Refunds | If the tool does not work as described, or has an error we cannot fix, email [email protected] with your order number within 14 days of purchase and we will refund you in full. Refunds are not offered for a change of mind once a file has been downloaded. Read the full refund policy. |