Stop Hopping Between Tabs. The Canvas Lets You Run 75 Calculators Side by Side.
Stack multiple SaaS calculators side by side, compare metrics in real time, and see your whole business in one place. No account required.
If you run a SaaS business, you probably have the same habit I did. You open the MRR calculator in one tab. Then the churn calculator in another. Then LTV:CAC in a third. You switch back and forth, copy numbers from one result into the next input, and try to hold everything in your head at once.
It works, but it's slow. And it's easy to make mistakes when you're copying numbers across tabs. I know because I did it for months before I got annoyed enough to build something better.
So I built Canvas.
What It Is
Canvas is a workspace inside SaaStainedNumbers where you can load multiple calculators at the same time. Instead of one calculator per page, you get a grid of them. Add the calculators you need, adjust the inputs on each one, and watch the Executive Summary at the top update everything in real time.
You can use it right now at saastainednumbers.com/canvas. No signup. No credit card. It just works.
Why We Built It
The short answer: because I needed it.
When I was working on my own SaaS metrics, I kept wanting to see how things connected. If I dropped churn by 2%, what would that do to my LTV:CAC ratio? If I spent more on marketing, how would it affect my burn multiple? With separate calculators, I had to run the numbers, write down the results, and run another calculator. It was like doing math by hand in 2026.
The longer answer is that most calculator sites treat each metric like it lives in a vacuum. MRR is here, churn is over there, and never the twain shall meet. But real businesses don't work that way. Your growth rate affects your burn multiple. Your churn rate changes your LTV. Your LTV and CAC together tell you if your business is healthy. These numbers are all connected, and your tools should reflect that.
So I made a tool that does.
How to Use It
Canvas is designed to be obvious. Here's the fastest way to get value from it.
Pick a template. When you open Canvas, the first thing you'll see is a section called Quick Start Templates. Click one. I'd start with the SaaS Starter Pack, which loads MRR, churn, LTV, CAC, and gross margin onto your workspace in one click. You can also start blank and build your own.
Adjust the inputs. Each calculator on the workspace has the same sliders and fields as the full-page version. Change a number and the result updates instantly. The cool part is that all calculators on your workspace are live at the same time, so you can see the whole picture without flipping tabs.
Watch the Executive Summary. At the top of your workspace, there's a summary bar that rolls up the key numbers across every calculator on your board. Total MRR, average churn rate, best LTV:CAC ratio, total costs. It updates automatically as you tweak inputs.
That's it. Three steps and you're analyzing your business like a board meeting prep session.
A Real Example
Say you're trying to figure out whether you can afford to hire a second salesperson. Here's how you'd use Canvas to answer that:
- Open Canvas and pick the Business Health Check template. It loads break-even, burn rate, cash runway, employee cost, and ROI calculators.
- Enter your current revenue and expenses into the break-even calculator. See how far you are from profitability.
- Move to the employee cost calculator and add the salary, benefits, and overhead for a new hire.
- Watch the cash runway calculator update to show how much time the new hire costs you.
- Check the ROI calculator to see how much additional revenue you'd need to justify the cost.
The whole analysis takes about two minutes. With separate calculators, you'd spend that long just finding the right tabs.
What Makes This Different
There are plenty of calculator sites on the internet. I've used most of them. They're good at what they do, but what they do is give you one number at a time.
Canvas is different in a few specific ways:
It's a workspace, not a page. You're not navigating between 75 separate URLs. You pick the calculators you need and they all live on one screen. Your workspace saves to your browser, so when you come back tomorrow everything is where you left it.
It has templates for real workflows. The templates aren't random. They're built around actual analysis patterns that SaaS founders use every day. The Unit Economics Deep Dive, the Churn & Retention Audit, the AI Cost Analyzer. Each one loads the exact calculators you need for that specific analysis.
The Executive Summary connects everything. This is the part I'm most proud of. The summary bar at the top reads the outputs from every calculator on your workspace and aggregates them. Total MRR across all your models. Average churn rate. Best LTV:CAC ratio. You can't get this from any other calculator site because no other site lets you run multiple calculators at the same time.
What's Coming
Canvas just launched and I have a list of things I want to add. Custom formulas so you can define your own aggregate calculations. Export to PDF for board decks. Shared workspaces so you can collaborate with your co-founder. More templates for specific industries.
But honestly, the core is already useful. I use it every day, and I think you'll find it valuable too.
Try It
Canvas is live at saastainednumbers.com/canvas. It's free, it doesn't need an account, and it works in under 60 seconds.
Load the SaaS Starter Pack, adjust a few sliders, and see your whole business in one view. I think you'll like it.
Canvas is part of SaaStainedNumbers. 75 free SaaS calculators with benchmarks, insights, and a multi-calculator workspace. Built for founders who want to understand their numbers.