Financial calculator category

Startup & SaaS calculators

Startup & SaaS calculators: Model recurring revenue, retention, acquisition economics and ownership dilution. The category holds 14 tools, including the MRR & ARR Calculator, the Net Revenue Retention Calculator and the LTV:CAC Calculator.

MRR & ARR and MRR Growth track recurring revenue, and SaaS Churn, Gross and Net Revenue Retention show how much of it you keep. LTV:CAC and CAC Payback judge whether acquisition spending pays off, and the SaaS Magic Number and Rule of 40 measure efficiency. On the funding side, Pre-Money & Post-Money Valuation, Startup Dilution, Option Pool Dilution, SAFE Conversion and Convertible Note show what each round does to ownership. Model dilution early.

Among the tools here are MRR & ARR Calculator, Net Revenue Retention Calculator, LTV:CAC Calculator, CAC Payback Calculator, SaaS Churn Calculator, Pre-Money & Post-Money Valuation Calculator, Startup Dilution Calculator, SAFE Conversion Calculator, and 6 more that follow the same pattern of formula, worked example, limits and sources.

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01

MRR & ARR Calculator

Calculate ending monthly recurring revenue and annual recurring revenue.

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02

Net Revenue Retention Calculator

Calculate NRR and GRR from expansion, contraction and churn.

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03

LTV:CAC Calculator

Estimate customer lifetime value and the LTV-to-CAC ratio.

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04

CAC Payback Calculator

Estimate how many months of customer gross profit recover acquisition cost.

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05

SaaS Churn Calculator

Calculate monthly customer churn and a simple implied customer lifetime.

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06

Pre-Money & Post-Money Valuation Calculator

Calculate investor and existing-holder ownership after a priced round.

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07

Startup Dilution Calculator

Estimate ownership dilution from a new investment round.

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08

SAFE Conversion Calculator

Estimate conversion valuation and ownership from a SAFE cap or discount.

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09

Convertible Note Calculator

Estimate accrued note value and conversion ownership under a cap or discount.

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10

MRR Growth Calculator

Calculate ending MRR, net new MRR and net growth rate.

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11

Gross Revenue Retention Calculator

Calculate recurring-revenue retention before expansion.

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12

SaaS Rule of 40 Calculator

Add annual recurring-revenue growth and profitability margin.

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13

SaaS Magic Number Calculator

Compare annualized net new recurring revenue with prior-quarter sales and marketing spend.

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14

Option Pool Dilution Calculator

Calculate new pool shares and existing-holder dilution at a target pool percentage.

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Every tool, one table

Startup & SaaS calculators at a glance

Each row shows the headline figure that calculator returns at its own worked-example inputs.

200$45,000225$50,000250$55,000275$60,000300$65,000
MRR & ARR Calculator: ending MRR by customers.
All 14 startup & saas calculators on Free Calculators Online, with the result each returns at its worked-example inputs.
CalculatorWhat it answersHeadline outputWorked example
MRR & ARR CalculatorKeep recurring and nonrecurring revenue separate.Ending MRR$55,000
Net Revenue Retention CalculatorUse one cohort and period consistently.Net revenue retention104.0%
LTV:CAC CalculatorStress-test churn, margin and acquisition cost.Estimated customer LTV$6,400
CAC Payback CalculatorCompare payback with churn and cash runway.CAC payback period7.5 months
SaaS Churn CalculatorUse cohort retention for a more complete view.Monthly customer churn2.5%
Pre-Money & Post-Money Valuation CalculatorMake dilution visible before financing.Investor post-money ownership20.0%
Startup Dilution CalculatorInclude option-pool changes and convertible securities separately.Investor post-money ownership20.0%
SAFE Conversion CalculatorModel the exact capitalization definition and security terms separately.Estimated SAFE ownership5.9%
Convertible Note CalculatorConfirm interest, maturity and qualified-financing terms.Estimated conversion ownership6.5%
MRR Growth CalculatorReconcile new, expansion, contraction and churn under one revenue policy.Net MRR growth rate13.0%
Gross Revenue Retention CalculatorUse one starting cohort and consistent period.Gross revenue retention89.0%
SaaS Rule of 40 CalculatorUse a consistent profit measure and avoid treating 40 as universal.Rule of 40 score42.0%
SaaS Magic Number CalculatorReconcile definitions and examine CAC payback alongside it.SaaS magic number2.40×
Option Pool Dilution CalculatorModel whether the pool increase occurs before or after financing.Additional pool shares needed777,777.8

Where people go wrong with startup & saas numbers

Founders often celebrate growth without looking at churn, but a leaky bucket needs ever more acquisition spending. LTV:CAC depends on assumed lifetimes that early data cannot support, so treat it as a rough guide. Dilution compounds through rounds and option pools, and a SAFE or note converts at terms that change the result. These are models, and real term sheets and legal documents govern. Retention first. Growth on a leaky bucket fails.

Background reading

Startup & SaaS guides

Definitions

Startup & SaaS terms

Annual recurring revenue (ARR) : glossary term
A recurring-revenue run rate commonly calculated as monthly recurring revenue multiplied by twelve.
Gross revenue retention (GRR) : glossary term
Recurring revenue retained from a starting cohort after churn and contraction, excluding expansion.
Monthly recurring revenue (MRR) : glossary term
Recurring subscription value normalized to one month under a stated revenue policy.
Net revenue retention : glossary term
Revenue from an existing customer cohort at period end against its start. Expansion, contraction and churn count. New customers do not.
Vesting : glossary term
The process by which a right to an asset or contribution becomes non-forfeitable over time. Unvested employer contributions are lost if employment ends first.

Keep exploring

Related calculator categories

Next to the startup & saas tools, these categories answer the questions that usually come up alongside them.

Common startup & saas questions

What is a good net revenue retention rate?

Above one hundred percent means the existing customer base grows without any new sales, which is a strong position. What counts as good varies substantially by segment, since businesses selling to larger organisations typically achieve more expansion than those selling to very small ones.

How do I calculate customer acquisition cost?

Total everything spent to acquire customers in a period, sales and marketing salaries, commissions, tooling and attributable overhead, not just advertising, divided by customers acquired. Excluding people costs is the most common way CAC is understated.

What LTV to CAC ratio should I target?

Commonly cited thresholds depend on churn assumptions far into the future that young companies cannot support. CAC payback period is a better operating target because it is grounded in observed cash flows and depends on fewer assumptions.

How much equity should I give investors?

It follows from how much you raise and at what valuation , not being chosen directly. The more useful question is whether the capital produces more value than the ownership it costs, since a smaller share of a much larger outcome is worth more.

What is the difference between MRR and revenue?

MRR counts normalised recurring subscription revenue and excludes one-time fees, professional services and usage overages. Total revenue includes everything. Blending them overstates the predictable base and distorts the growth rate.

How does an option pool affect founder ownership?

Investors typically require a pool established before the investment, which means it dilutes existing holders instead of the incoming investor and effectively lowers the pre-money valuation. It is a substantive negotiation, not an administrative detail.

What is a valuation cap on a convertible note?

A maximum valuation at which the instrument converts. If the priced round is above the cap, it converts as though the valuation were the cap, giving the investor more shares for the same money. The further above the cap, the larger the effect.

Should I optimise for growth or profitability?

It depends on capital availability, unit economics and how defensible the market position is. Growth funded by capital that may not be available later is fragile. Profitability that forgoes a durable position can be equally costly. The honest version of the question is which risk you can survive.

People also ask

Startup & SaaS calculator questions

What is a good LTV to CAC ratio?

Around 3 to 1 is a common benchmark, meaning a customer returns three times what it cost to acquire, though it varies by stage.

What does net revenue retention measure?

It is the revenue from an existing customer group a year later including upgrades and churn, and above 100% means the base grows by itself.

How does an option pool dilute founders?

The pool is usually created before the round, so it reduces founder and existing holder percentages, not the new investors' stake.