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SaaS Quick Ratio Calculator

Enter New MRR, Expansion MRR and Reactivation MRR plus 2 more inputs — every figure updates as you type. Nothing you type leaves your browser.

How do you calculate SaaS Quick Ratio?

The SaaS quick ratio divides the MRR you gained — new, expansion and reactivation — by the MRR you lost to contraction and churn. It measures growth efficiency: a ratio of 4 means four dollars of recurring revenue arrived for every dollar that left. This calculator returns the ratio alongside the gained, lost and net-new components behind it.

Quick ratio

4.23

MRR gained per unit lost. Shows 0 when nothing was lost.

MRR gained: $9,100New + expansion + reactivation.
MRR lost: $2,150Contraction + churn.
Net new MRR: $6,950Gained minus lost — the actual movement in the top line.

Results are rounded for display; the calculation runs at full precision.

The maths

How SaaS Quick Ratio is calculated

The formula this calculator runs, written out so you can check it against your own model rather than trust a black box.

Quick ratio = (new + expansion + reactivation MRR) ÷ (contraction + churned MRR)

new: MRR from customers who started paying this period.
expansion: Additional MRR from existing customers: upgrades, seat increases, add-ons, coupon expiries.
reactivation: MRR from previously cancelled customers who returned. Reactivated customers rejoin their original cohort.
contraction: MRR lost to downgrades and seat reductions.
churned: MRR lost to full cancellations.

Reading the result

What the number is telling you

Bands are directional, not verdicts. Stage, price point and contract length move every one of them, so treat these as a starting point for the conversation rather than a grade.

Below 1: You are losing more recurring revenue than you are adding, so MRR is falling regardless of how strong new sales look. Acquisition cannot fix this — at a ratio below 1 every additional customer arrives into a leaking base. Retention is the only lever that changes the direction.
1 – 2: Growing, but inefficiently: roughly half of everything you gain is spent replacing what you lost. Acquisition costs are effectively doubled because much of the spend buys back existing revenue. Look at where the losses sit — involuntary churn from failed payments is usually the fastest component to reduce.
2 – 4: Solid, sustainable growth. Gains clearly outweigh losses and the business compounds without extraordinary acquisition effort. Most healthy subscription businesses operate here, and moving into the next band is typically about expansion revenue rather than reducing churn further.
4 and above: Efficient growth by the common benchmark — four units of recurring revenue arriving for every one lost. Check the composition before celebrating: a ratio carried entirely by new business behaves very differently from one supported by expansion on a well-retained base, and only the second compounds on its own.

What the ratio adds that net new MRR does not

Net new MRR tells you whether you grew. The quick ratio tells you how hard you had to work for it. Two businesses can both add 6,950 of net new MRR: one gained 9,100 and lost 2,150, the other gained 25,000 and lost 18,050. The first has a quick ratio above 4 and a durable growth engine. The second is at 1.4 and is running a treadmill — most of its acquisition spend is replacing revenue it already had.

That distinction is invisible in a growth chart, which is exactly why this ratio is worth tracking. It is a leading indicator: leakage widens before the growth curve bends.

The bands, and the rule of thumb

A quick ratio of 4 or above is a widely used benchmark for efficient growth in subscription businesses, popularised by SaaS investors as a single-number screen. Treat it as a directional rule of thumb rather than a target: what matters more is your own trend and the composition underneath. A ratio of 4 sustained across a year says considerably more than a ratio of 7 in one unusually good month.

Read the components as well as the ratio. A high number driven entirely by new business is fragile — it depends on acquisition continuing at the same pace. The same number driven by expansion on a well-retained base compounds on its own.

Keeping the inputs honest

The ratio is only as good as the movement classification behind it, and that classification has real edge cases:

A returning customer is reactivation, not new. Counting them as new inflates acquisition and hides a retention problem.
A customer moving from monthly to annual billing at a lower effective monthly rate is contraction, even though the invoice is larger.
An expiring coupon is expansion — the customer now pays more. Applying a 100% coupon to a paying customer is churn.
A customer who signs up and cancels within the same period should wash out of both sides rather than inflating gains and losses simultaneously.
Where a customer holds several subscriptions, designate a base plan so that adding an add-on reads as expansion rather than as a new customer.

Bastle classifies every movement automatically against rules you set, and lets you click any figure to see the customers and invoices behind it — so a quick ratio can be traced to the individual subscriptions that produced it. Free while in beta, no card required.

Definition

Where SaaS Quick Ratio gets argued about

A calculator settles the arithmetic, not the definition — and the definition is where most disagreements about this number actually live. The glossary entry covers the conventions, the edge cases and how Bastle handles each one.

Read the SaaS Quick Ratio definition Browse the metric glossary

Related calculators

Numbers that move together

No subscription metric is meaningful on its own. These are the ones worth running next.

Net Revenue Retention Calculator

Net Revenue Retention measures what happened to the revenue of a fixed group of existing customers over a period: starting MRR plus expansion, less contraction and churn, divided by starting MRR.

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Churn Rate Calculator

Customer churn rate is the number of customers who cancelled during a period divided by the number active at the start of that period, expressed as a percentage.

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MRR Calculator

Monthly Recurring Revenue is the monthly-normalised value of every active paid subscription: monthly plans at face value, quarterly plans divided by three, annual plans divided by twelve, less active discounts.

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ARR Calculator

Annual Recurring Revenue is Monthly Recurring Revenue multiplied by twelve — a run rate describing what the current subscription book would produce over a year if nothing changed.

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Frequently asked questions

What is a good SaaS quick ratio?

Four or above is the widely cited benchmark for efficient growth, meaning four units of recurring revenue gained for every one lost. Below 1 the business is shrinking. Between 1 and 2 growth is happening but most of the effort goes into replacing lost revenue. Treat the benchmark as directional — your own trend over several months is more informative than any single reading against a fixed target.

Why does the calculator show 0 when I have no losses?

Because dividing by zero has no meaningful answer. If you lost nothing at all, the ratio is undefined rather than infinite, so the calculator returns 0 instead of showing NaN or Infinity. A period with genuinely zero contraction and zero churn is almost always a very small book or an incomplete data set — check that cancellations are actually being recorded before reading anything into it.

Should reactivation MRR count as new or as a gain?

Count it as reactivation — a separate category that sits on the gain side of the ratio but is tracked distinctly from new business. Classifying returning customers as new overstates acquisition performance and conceals the fact that you previously lost them. Reactivated customers should also rejoin their original signup cohort so that cohort retention curves stay accurate.

How is the quick ratio different from net revenue retention?

Net revenue retention looks only at existing customers and excludes new business entirely, measuring whether the base you already had grew. The quick ratio includes new customers and compares all gains against all losses, measuring the efficiency of total growth. NRR answers whether your customers are worth more over time; the quick ratio answers whether growth is outrunning leakage.

What period should the quick ratio be measured over?

Monthly is standard, with a rolling three-month average for anything you present externally. Single months are noisy in small books — one large upgrade or one departing enterprise account can move the ratio by several points without signalling any change in the underlying business. Use the trend to make decisions and the single month only as an alert.

Stop recalculating SaaS Quick Ratio by hand.

Connect Stripe and Bastle keeps SaaS Quick Ratio current — backfilled to your first customer, segmentable, and traceable to the invoices behind it. Free while in beta, no card required.

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