OnSumoTools

SaaS Magic Number Calculator

Measure how efficiently last quarter's sales and marketing spend converted into new ARR, with gross-adjusted and simple Magic Numbers.

100% client-side. GTM inputs stay in your browser (ons-saas-magic-number-inputs).

Magic Number = (new ARR x gross margin) / prior-quarter S&M spend. Above 1.0 on the adjusted metric is a common signal to scale GTM.

Magic Number (gross-margin adjusted)

1.40

Strong: accelerate S&M

Simple Magic Number (no margin): 2.00

New ARR this quarter

$400,000

S&M spend last quarter

$200,000

Gross margin

70%

Simple Magic Number

2.00

Breakeven for Magic Number = 1.0

At your prior-quarter S&M of $200,000, you need about $285,714 in new ARR this quarter to hit Magic Number 1.0 (gross-margin adjusted).

Or at your current new ARR of $400,000, S&M of $280,000 last quarter would yield MN 1.0.

Above 1.0: scale S&M while monitoring payback and churn.

Current quarter inputs

Quarterly history (optional)

Up to 8 rows. Each row needs ARR and prior-quarter S&M for trend Magic Numbers.

No history rows yet.

How does the SaaS Magic Number Calculator work step by step?

The SaaS magic number answers a simple question: for every dollar you spend on sales and marketing, how many dollars of new annual recurring revenue do you get back? A magic number of 1.0 means you generated $1 of new ARR for every $1 of S&M spend. Above 0.75 is generally considered efficient. Below 0.5 suggests your go-to-market engine needs work before you scale spending. The calculator takes three inputs: current and previous quarter ARR determine how much new ARR you added. Previous quarter S&M spend is the denominator because sales and marketing investments typically take a quarter to produce results.

What does a typical SaaS Magic Number Calculator result look like?

Company profile: Q1 ARR: $8,000,000. Q2 ARR: $9,200,000. Q1 S&M spend: $1,500,000. New ARR: $9,200,000 - $8,000,000 = $1,200,000. Magic Number: $1,200,000 / $1,500,000 = 0.80. Interpretation: A magic number of 0.80 falls in the 'efficient' band. This company generates $0.80 of new ARR for every dollar spent on sales and marketing. This is a healthy ratio that supports continued or increased investment.

Frequently asked questions

  • What is a good SaaS magic number?

    Above 0.75 is the standard benchmark for efficient sales. Above 1.0 is excellent and signals you should invest more aggressively. Below 0.5 suggests structural problems in your go-to-market that need fixing before you scale. Use this metric consistently over time to track improvement rather than optimizing for a single period's snapshot.

  • How is the magic number different from CAC payback?

    The magic number measures aggregate sales efficiency at the company level. CAC payback measures the time to recover the cost of acquiring one customer. They are related but answer different questions. A company can have a strong magic number but long CAC payback if deal sizes are small with high retention.

  • Why does the formula use last quarter's spend?

    Sales and marketing investment takes time to convert. A prospect who sees your ad in January might close in April. Using the previous quarter's spend aligns the cost with the revenue it most likely produced.

  • What if my magic number is above 2.0?

    A magic number above 2.0 is unusual and worth investigating. It could mean your product has strong organic growth that is not driven by S&M spend, or that you are under-investing in sales and leaving revenue on the table. It may also reflect seasonal spikes or large enterprise deals that will not repeat.

  • How do I improve a low magic number?

    Three approaches: improve lead quality (higher conversion rate from pipeline to closed), reduce sales cycle length (faster time to revenue), or reduce cost per lead (more efficient marketing channels). Focus on one at a time and measure the magic number quarterly to track progress. Run the calculation monthly to track trend direction rather than relying on a single data point.

  • Does the magic number account for churn?

    No. The magic number uses gross new ARR, not net ARR. If you have high churn, your net ARR growth will be lower than your magic number suggests. Track the magic number alongside net revenue retention for a complete picture of growth efficiency.

Related tools

What the magic number measures

It answers a blunt question. For every dollar you spent on sales and marketing last quarter, how much new recurring revenue showed up this quarter?

The formula takes the change in quarterly recurring revenue, annualizes it, and divides by prior-quarter sales and marketing spend. The tool gives a simple version and a gross-adjusted one that accounts for margin.

Reading the bands

Above about 0.75 usually means you can spend more on growth. The engine converts dollars to revenue efficiently. Below 0.5 suggests fixing efficiency before adding budget. In between, hold steady and watch.

A number above 2.0 is rare. Check it twice. It might mean a big one-off deal, or spend that was too low in the prior quarter.

Why last quarter's spend

Sales take time. A lead you pay for today closes weeks or months later. Matching this quarter's revenue to last quarter's spend lines up cause and effect better than using the same period.

If your sales cycle is long, as in enterprise, the lag is longer and the number will be noisier.

Magic number versus CAC payback

They look at the same thing from different sides. Payback counts months to recover cost. The magic number shows revenue gained per dollar spent. Neither includes churn, so a high number can still hide a leaky base.

Run both. Add NRR to see whether the new revenue sticks.

Improving a weak number

Look at conversion rates in your funnel, the mix of channels, and sales ramp time. Cutting a poor channel often lifts the number faster than finding a new one.

The optional quarterly chart shows the trend, which matters more than any single quarter. Your inputs stay in your browser.