SWaP Budget Calculator

Track size, weight and average/peak power across an integrated payload or subsystem against platform allowances.

A component-level size, weight and power budget with reserve and resource margins.

Start here

  1. Enter the platform allowances for mass, power and volume.
  2. Add the components with their average/peak power, mass, bounding volume and quantity.
  3. Choose Calculate to see totals and margins for each resource.
How to read the results

Check each margin separately. A total volume allowance alone does not establish that the components can be installed together.

Local calculation: values are processed in your browser. Calculation inputs are not transmitted. Optional profiles are stored only in this browser.
Optional aircraft profile: Manual values
Active profile: Manual values
kg
W
W
L
%

Integrated components

Enter bounding volume rather than assuming it proves fit or installation access.

ComponentMass (kg)Avg WPeak WVolume (L)QtyRemove

Planning output only. Verify assumptions and results against authoritative data, manufacturer information, approved procedures, test evidence and competent engineering or regulatory review before use.

Calculation basis

Component mass, average power, peak power and bounding volume are multiplied by quantity and summed. Each platform allowance is reduced by the engineering reserve before the corresponding margin is reported.

Limitations and verification

  • Bounding volume does not prove geometric fit, access, cooling, separation or maintainability.
  • Mass budget does not assess centre of gravity or structural load paths.
  • Power budget does not replace detailed electrical, thermal and EMC analysis.

Version and review status

Formula set: v1.2
Staging review date: 17 August 2026
Status: Staging beta pending user acceptance and cross-browser checks.

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