# SaaS marketing budget calculator

> How much to spend based on your revenue, growth target and current CAC, rather than last year plus ten percent. See the formula, change the inputs and save your results.

Source: https://saas-marketing.net/calculators/marketing-budget/
Topic: B2B SaaS Marketing
Type: calculator
Published: 2026-09-17
Last updated: 2026-09-17
Publisher: SaaS Marketing (saas-marketing.net)
License: CC BY 4.0. Quote or republish with attribution and a link to https://saas-marketing.net/calculators/marketing-budget/

## Short answer

SaaS marketing budget uses current arr, target growth rate, fully loaded cac and the additional inputs below to estimate marketing budget. Change the example inputs to your own figures. The result is a planning calculation, not an industry benchmark or a prediction.

## Key takeaways

- The main result is marketing budget; the formula is shown below.
- Keep the reporting period, currency and customer cohort consistent across inputs.
- Defaults are an illustrative scenario. A blank, invalid or undefined ratio displays as n/a.

---

Use this tool alongside the [b2b saas marketing guide](/b2b-saas-marketing/). How much to spend based on your revenue, growth target and current CAC, rather than last year plus ten percent.

<Calculator id="marketing-budget" cluster="b2b-saas-marketing" />

## Which inputs do you need?

| Input | Example value | What to check |
| --- | --- | --- |
| Current ARR | 5,000,000 | Use the value from the same reporting period as the other inputs. |
| Target growth rate | 60% | Use the value from the same reporting period as the other inputs. |
| Fully loaded CAC | 12,000 | Use the value from the same reporting period as the other inputs. |
| Average contract value | 14,000 | Use the value from the same reporting period as the other inputs. |
| Marketing share of sales and marketing spend | 40% | Use the value from the same reporting period as the other inputs. |
| Annual revenue churn | 12% | Use the value from the same reporting period as the other inputs. |

Before entering numbers, choose the unit of analysis. An account, a user and a paying subscription are different objects. Counting users in one field and accounts in another can produce a precise answer to the wrong question. Record the start and end dates beside your source export so another person can reproduce your work.

## What formulas does the calculator use?

### Target ARR

```text
targetarr = arr * (1 + target / 100)
```

This output is expressed as currency in the same units as the inputs.

### Gross new ARR needed

```text
gross = (targetarr - arr) + (arr * churn / 100)
```

Growth plus what churn takes away.

### New customers needed

```text
customers = acv > 0 ? gross / acv : NaN
```

This output is expressed as a number.

### Total sales and marketing budget

```text
sm = customers * cac
```

This output is expressed as currency in the same units as the inputs.

### Marketing budget

```text
marketing = sm * mktshare / 100
```

This output is expressed as currency in the same units as the inputs.

### Marketing as a share of ARR

```text
pct = arr > 0 ? (marketing / arr) * 100 : NaN
```

This output is expressed as a percentage.

Percent fields use whole percentages: enter 5 for five percent. The formula divides by 100 where a decimal rate is needed. Values in the formulas correspond to the labelled inputs above; earlier outputs can be used by later formulas.

## Worked example

The defaults are a constructed scenario, not results from a named company or survey. With the example inputs above, the calculation produces:

| Output | Example result |
| --- | --- |
| Target ARR | 8,000,000 |
| Gross new ARR needed | 3,600,000 |
| New customers needed | 257.14 |
| Total sales and marketing budget | 3,085,714.29 |
| Marketing budget | 1,234,285.71 |
| Marketing as a share of ARR | 24.69% |

Change one assumption at a time and watch the main result. Then test a conservative case by reducing the expected benefit or increasing the associated cost. If a decision works only at the most optimistic settings, investigate the uncertain input before committing the budget.

## How should you interpret the result?

A formula describes the assumptions entered into it. It cannot establish that a channel caused a sale, that historical retention will continue, or that a projected cost is achievable. Compare the output with your own previous cohorts before using a broad market comparison.

For a management review, save the result together with the source date, segment, owner and planned action. Recalculate when the underlying input changes. Keep a separate copy of the original scenario so the team can explain the difference between the plan and the observed outcome.

## Continue the analysis

Use the [metrics guide](/saas-metrics/) to align definitions, browse [all calculators](/calculators/) for adjacent calculations, and keep a [measurement worksheet](/resources/) beside the model. The [pricing hub](/saas-pricing/) and [growth hub](/saas-growth/) cover decisions that often change these inputs.
{/* expanded-practice-2026-09 */}
## Apply saas marketing budget calculator in a working review

Record the source and unit of every input before using the result. Change one assumption at a time to understand which inputs matter most. Keep outputs that describe money, time and percentages distinct, and preserve undefined cases rather than converting them into plausible-looking zeroes.

For this topic, involve the account owner, customer champion and relevant implementation specialist and work from the buying-process map and current evaluation record. The relevant unit is one buying account with a specific workflow. State the question the review should resolve before choosing a chart, an asset or a tool. If participants disagree about the unit or scope, resolve that disagreement before combining their evidence.

### Evidence to prepare

Distinguish the user, the commercial approver and the person who can block implementation. A contact can be enthusiastic without owning the budget or the required system access. Keep confirmed statements separate from inferred intent, and let the next step resolve an actual buyer question.

| Review field | What to record |
| --- | --- |
| Topic | SaaS marketing budget calculator |
| Decision | The specific action this explanation should help you choose |
| Working evidence | the buying-process map and current evaluation record |
| Unit and scope | one buying account with a specific workflow |
| Responsible people | account owner, customer champion and relevant implementation specialist |
| Remaining uncertainty | The missing fact that could change the decision |

### Two situations that can change the interpretation

#### When B2B demo requests lack a use case

A request about replacing spreadsheet reporting needs a different session from a request about a production integration requirement.

Use this check: Review a sample of requests and identify the minimum context needed to choose a useful demo. Do not make a short inquiry form into a burdensome procurement questionnaire.

The [focused diagnostic guide](/guides/b2b-demo-requests-lack-use-case/) provides the correction process and a working evidence sheet.

#### When a champion cannot explain the business case

A enthusiastic user may need implementation evidence for IT and an operating-cost explanation for finance, not another product brochure.

Use this check: Ask the champion to explain the problem, current cost, proposed change and approval requirements in their own words. Do not invent financial savings or write claims the champion cannot defend.

The [focused diagnostic guide](/guides/champion-has-no-internal-business-case/) provides the correction process and a working evidence sheet.

### Record the decision and the limit

A champion may understand the product while still needing a security review and a data owner to participate. Sending another broad deck does not resolve those dependencies. A short acceptance exercise and a named owner for each requirement can make the decision more concrete.

Keep the conclusion beside the evidence that supports it. Record what the team will do, who owns the next action and which event or date will trigger a review. If the underlying definition, audience or product behavior changes, revisit the conclusion rather than assuming the old result still applies. A clear limit is useful information; it tells the next reader where additional investigation is required.

Use the [complete topic collection](/topics/b2b-saas-marketing/) for related methods and the [category field guides](/industries/) when the product's buying situation or implementation requirements change how the method should be applied.

### A reproducible sensitivity exercise

The [saas marketing budget calculator tool](/calculators/marketing-budget/) provides a related numerical exercise. Its current default inputs are constructed examples, not industry observations. Under those defaults, the output labelled **Marketing budget** is **1,234,285.71** in the tool's displayed units. The table changes one input at a time and leaves the others at their defaults.

| Input changed | Default input | Alternative input | Marketing budget after change |
| --- | --- | --- | --- |
| Current ARR | 5,000,000 | 6,000,000 | 1,481,142.86 |
| Target growth rate | 60 | 72 | 1,440,000 |
| Fully loaded CAC | 12,000 | 14,400 | 1,481,142.86 |
| Average contract value | 14,000 | 16,800 | 1,028,571.43 |
| Marketing share of sales and marketing spend | 40 | 48 | 1,481,142.86 |
| Annual revenue churn | 12 | 14.4 | 1,275,428.57 |

The alternative inputs are sensitivity cases, not recommended targets. A result marked not defined means the proposed combination does not satisfy the model or produces an undefined ratio. Keep that state visible. If the output changes sharply after a small input change, investigate the uncertain input before using the model to justify a larger commitment.

Compare the model's scope with the concept on this page. The calculator may represent one particular application rather than every use of the term. Record the reporting period, currency where relevant, and the source of the real values you enter.

## Frequently asked questions

### How does this saas marketing budget calculator work?

It evaluates the formulas shown on this page in your browser. How much to spend based on your revenue, growth target and current CAC, rather than last year plus ten percent. Inputs are not sent to a calculation server.

### Are the default values SaaS industry benchmarks?

No. They are example inputs chosen to demonstrate the calculation. Replace them with your billing, CRM or finance records before making a decision.

### Why does a result show n/a?

The calculation is undefined or an input is outside its allowed range. Check for an empty field, a zero denominator or an impossible percentage before interpreting the result.

### Can I save or share my calculation?

Use Print or save results to create a local PDF with your browser. Review the inputs before sharing and remove confidential customer or company information.