106 free tools · no sign-up

Little tools that do the boring math

Free calculators and generators I built for myself while running SaaS. No login, no email wall — pick one and get your answer. Everything runs right here in your browser.

106

tools

$0

forever

0

to install

Customer Metrics

Measure loyalty, retention, and overall account health.

NPS Calculator

Turn promoter and detractor counts into your Net Promoter Score in one tap.

Open tool Retention

Churn & Retention

See what share of customers you keep — and lose — each period.

Open tool Success

Customer Health Score

Blend usage and satisfaction signals into one at-a-glance score.

Open tool Acquisition

CAC Calculator

Work out what it costs to acquire one new customer.

Open tool Acquisition

CAC Payback Period

See how many months it takes to earn back your CAC.

Open tool Engagement

DAU / MAU Stickiness

Measure how sticky your product is day-to-day.

Open tool Retention

Negative Churn Calculator

Check whether expansion revenue outpaces churn.

Open tool Retention

Retention Rate Calculator

Calculate the share of customers you retain over a period.

Open tool Retention

Gross Revenue Retention (GRR)

Measure revenue kept from existing customers, before expansion.

Open tool Retention

Revenue Churn Rate

Calculate the percentage of recurring revenue you lose.

Open tool Satisfaction

CSAT Calculator

Calculate your Customer Satisfaction Score from survey ratings.

Open tool Retention

Cost of Churn Calculator

Put a dollar figure on the customers you lose.

Open tool Retention

Average Customer Lifespan

Estimate how long an average customer stays from your churn rate.

Open tool Retention

Renewal Rate Calculator

Calculate the share of customers who renew their subscription.

Open tool Satisfaction

Customer Effort Score (CES)

Average how easy customers find it to get things done.

Customer Concentration

See how dependent your revenue is on your biggest customers.

Open tool Growth

Referral Rate Calculator

Measure what share of signups come from referrals.

Revenue & Growth

Track and forecast recurring revenue and growth.

Lifetime Value Calculator

Estimate how much an average customer is worth over their whole lifespan.

Open tool Unit econ

LTV : CAC Ratio

Check whether each customer you acquire actually pays off.

Open tool Growth

MRR Growth Calculator

Project where your MRR lands after months of compounding growth.

Open tool Growth

Revenue Run Rate Calculator

Annualize your current revenue into a run rate (ARR).

Open tool Growth

Growth Rate Calculator

Get the percentage growth between any two periods.

Open tool Growth

Marginal Revenue Calculator

See the extra revenue earned from selling more units.

Open tool Growth

Viral Coefficient Calculator

Calculate your K-factor to predict referral-driven growth.

Open tool Revenue

ARPU Calculator

Work out your average revenue per user.

Open tool Retention

Net Revenue Retention

Measure revenue kept and expanded from your existing base.

Open tool Revenue

ARR Calculator

Turn monthly recurring revenue into annual recurring revenue.

Open tool Growth

CAGR Calculator

Find the compound annual growth rate between two values.

Open tool Revenue

Net New MRR Calculator

Break down how much MRR you truly added this month.

Open tool Analytics

MRR Projection

Forecast monthly recurring revenue forward with growth and churn.

Financial Health

Monitor cash flow, profitability, and runway.

Burn Rate Calculator

Work out your gross and net monthly cash burn.

Open tool Cash flow

Cash Runway Calculator

See how many months of cash you have left at your current burn.

Open tool Profitability

Break-Even Calculator

Find how many units you must sell to cover all your costs.

Open tool Profitability

Net Profit Calculator

Calculate net profit and profit margin from revenue and costs.

Open tool Profitability

Unit Economics Calculator

Check the contribution margin on a single unit sold.

Open tool Efficiency

SaaS Quick Ratio

Measure growth efficiency: new revenue vs. lost revenue.

Open tool Profitability

EBIT Calculator

Calculate earnings before interest and taxes.

Open tool Efficiency

Rule of 40 Calculator

Test whether growth rate plus profit margin clears 40%.

Open tool Efficiency

Magic Number Calculator

Measure how much new ARR each sales & marketing dollar returns.

Open tool Profitability

Gross Margin Calculator

Calculate gross margin and gross profit from revenue and COGS.

Open tool Profitability

Gross Profit Calculator

Work out gross profit and margin from revenue and COGS.

Open tool Profitability

Operating Margin Calculator

Measure operating profit as a percentage of revenue.

Open tool Efficiency

Burn Multiple Calculator

See how much you burn for every dollar of new ARR.

Fundraising & Equity

Model valuation, dilution, and cap-table math.

Pre / Post-Money Valuation

Work out post-money valuation and investor ownership.

Open tool Fundraising

Cap Table Simulator

Track share counts and ownership % by holder.

Open tool Fundraising

Equity Dilution

See how founder ownership erodes across funding rounds.

Pricing & Valuation

Optimize pricing and estimate business value.

Markup Calculator

Turn cost and price into markup and margin percentages.

Open tool Pricing

Percentage Off Calculator

Apply a discount to a price and see the amount saved.

Open tool Valuation

SaaS Valuation Calculator

Estimate company value from ARR and a revenue multiple.

Open tool Valuation

Market Size Calculator

Size your TAM, SAM, and SOM for a market opportunity.

Freemium Conversion Rate

Calculate what share of free users upgrade to paid.

Open tool Pricing

Discount Margin Impact

See how a discount eats into your profit margin.

Open tool Pricing

Seat-Based Revenue

Model recurring revenue from a per-seat pricing plan.

Open tool Pricing

Price Elasticity of Demand

Measure how sensitive demand is to a price change.

Open tool Pricing

Annual Plan Discount

Compare monthly vs annual pricing and the effective discount.

Open tool Pricing

Van Westendorp

Derive an acceptable price range and optimal price from sensitivity survey data.

Open tool Pricing

Gabor-Granger

Find the revenue-maximizing price from willingness-to-pay data.

Open tool Pricing

Pricing Sensitivity

See how price changes move revenue given a conversion-elasticity assumption.

Open tool Pricing

Tiered Pricing Revenue

Model total MRR and ARR across pricing tiers with a revenue mix.

Marketing & Ads

Measure ad efficiency, funnels, and campaign returns.

CPC Calculator

Calculate cost per click from ad spend and clicks.

CPM Calculator

Calculate cost per thousand impressions.

CPA Calculator

Calculate cost per acquisition from spend and conversions.

Open tool Funnel

Lead Velocity Rate (LVR)

Track month-over-month growth in qualified leads.

Open tool Campaigns

Email Campaign ROI

Measure the return on an email marketing campaign.

Open tool Returns

Marketing Spend Payback

See how long it takes to recover marketing spend.

CPL Calculator

Calculate cost per lead from spend and leads generated.

Open tool Email

Email Open Rate

Calculate the open rate of an email campaign.

Open tool Funnel

Bounce Rate Calculator

Calculate the percentage of visitors who leave immediately.

Open tool Funnel

Revenue Per Visitor

Work out how much each site visitor is worth.

Performance & ROI

Measure marketing effectiveness and returns.

ROI Calculator

Calculate return on investment as a percentage.

Open tool Returns

ROAS Calculator

Measure revenue earned per dollar of ad spend.

Open tool Funnel

Conversion Rate Calculator

Find what percentage of visitors take the action you want.

Open tool Funnel

CTR Calculator

Calculate click-through rate for ads, emails, and content.

Open tool Efficiency

Revenue Per Employee

Gauge productivity as revenue generated per head.

Open tool Efficiency

Team Scaling Calculator

Estimate the headcount a revenue goal implies.

Open tool Experiments

A/B Test Significance

Check if the difference between two variants is significant.

Product Analytics

Gauge product-market fit and feature adoption.

Product-Market Fit Calculator

Run the Sean Ellis 40% test to gauge product-market fit.

Open tool Adoption

Feature Adoption Rate

See what share of users actually engage with a feature.

Open tool Onboarding

Activation Rate Calculator

See what share of signups reach their first real value.

Open tool Activation

Time to Value (TTV)

Calculate the average time it takes users to reach value.

Open tool Analytics

Feature Value / Usage

Decide what to promote, simplify, invest in or cut by value vs usage.

Open tool Analytics

Retention Curve

Plot retention decay across D1, D7, D30 milestones for one cohort.

Open tool Analytics

Cohort Retention

See retention decay by signup cohort in the classic PLG heatmap.

Customer Success

Measure support efficiency and account coverage.

Support Cost per Ticket

Work out what each support ticket actually costs you.

Open tool Support

Ticket Deflection ROI

Estimate savings from deflecting tickets with self-service.

Open tool Coverage

CSM Capacity Calculator

See how much ARR each customer success manager carries.

Open tool Onboarding

Onboarding Completion Rate

See what share of users finish onboarding.

Agile & Delivery

Track team throughput and delivery.

Sprint Velocity

Track completed points per sprint and forecast backlog completion.

Open tool Prioritization

Planning Poker

Estimate effort with Fibonacci cards and reach team consensus.

Product & Roadmap

Score and prioritize what to build next.

RICE Prioritization

Score and rank a whole backlog by reach, impact, confidence and effort.

Open tool Prioritization

ICE Score Calculator

Rank a list of ideas by Impact, Confidence, and Ease.

Open tool Prioritization

WSJF Calculator

Prioritize with SAFe's Weighted Shortest Job First.

Open tool Prioritization

Impact / Effort Matrix

Triage work into Quick Wins, Big Bets, Fill-ins and Time Sinks on a 2×2.

Open tool Prioritization

Value / Complexity Matrix

Prioritize by business value against build complexity on a 2×2.

Open tool Prioritization

MoSCoW Board

Scope a release into Must, Should, Could and Won't — drag between columns.

Open tool Prioritization

Eisenhower Matrix

Triage tasks into Do, Schedule, Delegate and Delete by urgency and importance.

Open tool Prioritization

Now / Next / Later

Plan a lightweight public roadmap across three horizons — drag to reorder.

Open tool Prioritization

Weighted Scoring

Rank options against custom weighted criteria in a decision matrix.

Open tool Prioritization

Opportunity Scoring

Find under-served needs — high importance, low satisfaction — worth targeting.

Open tool Prioritization

Kano Model

Classify features as Basic, Performance, Delighter or Indifferent.

Customer Profiles

Draft crisp, shareable profiles of who you're building for.

ICP Builder

Draft a crisp ideal-customer-profile card you can copy and share.

Open tool Profile

Persona Generator

Draft a shareable user persona with AI from a one-line description.

Research & Feedback

Ask better questions and read feedback faster.

Survey Question Generator

Generate survey questions tailored to exactly what you want to learn.

Open tool Feedback

Feedback Sentiment

Paste any feedback and get an AI read on how the customer really feels.

Open tool Research

Journey Map Builder

Map the end-to-end customer experience across stages to find pain points.

Open tool Research

Empathy Map

Build shared understanding of a user across Says, Thinks, Does and Feels.

Wish a tool existed?

Tell me what you keep calculating by hand and I'll probably build it.