KarobarKit
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E-commerce · Local-first · Beta

ROAS Calculator

Compare attributed revenue with ad spend and see the contribution-profit view behind ROAS.

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Check the method before you rely on the result

Tier C · Runs locally in this browser
Method
Attributed revenue divided by ad spend, with user-supplied variable costs shown separately.
ROAS = attributed revenue ÷ ad spend; contribution = revenue − ad spend − variable costs
Sources
1 reviewed reference
Open the source register
Effective period
Formula-based; no statutory effective period
Last verified
9 August 2026
Review every 365 days
Reviewer status
Product and domain review: specialist approval not required
Privacy
Scenario inputs and results stay in this browser. Values are not sent to analytics, a backend, a URL or a log. They are not saved by default; an explicit related-tool transfer is kept only in this tab until it closes or you replace it.
Important limitations
  • Attributed revenue may not equal collected revenue.
  • Attribution windows, refunds and overhead are not modeled.

Read all limitationsReport an error

Browse E-commerce · Methodology · Sources

A quick guide

Use the number with context

The answer is only useful when you know what it includes and what it leaves out.

How to use it

  1. Enter ad spend using the same period and unit as the other inputs.
  2. Enter attributed revenue using the same period and unit as the other inputs.
  3. Enter product cost using the same period and unit as the other inputs.
  4. Enter other variable costs using the same period and unit as the other inputs.

Formula

ROAS = attributed revenue ÷ ad spend; contribution = revenue − ad spend − variable costs

ROAS is a platform-attribution ratio; contribution profit is a broader scenario check.

Make it concrete

Worked example

₹2,00,000 attributed revenue on ₹50,000 ad spend produces 4.00x ROAS before cost interpretation.

Boundaries

What this tool does not assume

Limitations

  • Attributed revenue may not equal collected revenue.
  • Attribution windows, refunds and overhead are not modeled.

Edge cases

  • Ad spend must be greater than zero.
  • Break-even ROAS is unavailable when supplied variable cost is at least revenue.

Last reviewed 9 August 2026 · Formula version 1.0

Method & sources

How this result is grounded

The formula is deterministic and runs in your browser. Read the reference below for the method used by this tool.

  • Business economics methodology v1

    KarobarKit controlled methodology · authoritative reference · Checked 9 August 2026

    Supports: business economics formulas · rounding and scope limitations · estimate-only language

Questions

Frequently asked

Is high ROAS always profitable?

No. Product cost, fulfilment, refunds and other variable costs can make a high ROAS unprofitable.

What is break-even ROAS?

It is the ROAS needed to cover the supplied variable costs and ad spend under this simplified model.

Keep going

Related tools

A related local-first tool for the next step.

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Source register checked 9 August 2026.