Why I Built KnowYourNut

In the military, we had a saying for the kind of chaos that looks fine from the outside but is one bad day from falling apart: "organized disaster."

That's exactly what my finances looked like when I started my first business after leaving the Army.

I had revenue coming in. Customers were happy. I was working 14-hour days and felt like things were moving. But if you'd asked me, really asked me, what it cost to keep the doors open each month, I would've given you a number that was off by a few thousand dollars.

I didn't know my nut. And I didn't even know that was a problem until it almost became a crisis.

What "Know Your Nut" Actually Means in Business

If you've never heard the phrase, "know your nut" is old business shorthand for knowing your total fixed costs: the number you have to hit every single month just to keep the lights on and the doors open. Before profit. Before growth. Before anything else.

Your nut includes rent, utilities, insurance, loan payments, payroll, software, vehicle costs. Every recurring expense that shows up whether you sell anything or not.

When you know your nut, you know the floor. You know the minimum. And from there, you can make real decisions: Can I afford this hire? Should I take on this lease? What happens if I lose my biggest client?

When you don't know it, you're guessing. And guessing with money is how businesses die.

The Spreadsheet Problem

After the Army, I threw myself into running businesses. I did what every small business owner does: I opened Google Sheets and started building spreadsheets.

One for cash flow projections. One for break-even analysis. One for employee costs. One for pricing. One for quarterly tax estimates. One for tracking invoices.

Within six months, I had 11 spreadsheets. None of them talked to each other.

Every time my rent went up, I had to update it in 4 different files. When I hired someone, I'd update the payroll sheet but forget to adjust the break-even sheet. My cash flow projection was using numbers from two months ago because I hadn't gotten around to updating it.

I had a QuickBooks account too, but it lived in its own world. Good for bookkeeping, not great for the kind of forward-looking planning I needed to do. It told me where I'd been. It didn't help me figure out where I was going.

The worst part? I knew the information I needed was right there, spread across all those files. The data existed. It just wasn't connected. I'd make a decision based on numbers that were two months old because updating everything took half a day I didn't have. And every time I sat down to "do my numbers," I spent more time wrangling spreadsheets than actually thinking about my business.

I talked to other small business owners about this. Every single one had the same problem. Different spreadsheets, different tools, same disconnected mess. It wasn't a me problem. It was an industry problem.

The Moment I Decided to Build It

The breaking point was a Tuesday afternoon. I was trying to figure out whether I could afford to hire a second part-time employee. Simple question, right?

To answer it, I needed to know:

• My current monthly fixed costs (spreadsheet #1)
• The true cost of the employee, with taxes and insurance (spreadsheet #4)
• Whether my cash flow could absorb it for the next 3 months (spreadsheet #2)
• What my break-even point would look like after the hire (spreadsheet #3)
• My current profit margin and whether it could handle the compression (spreadsheet #7)

Five spreadsheets. One decision. And I still wasn't confident in the answer because half the inputs were stale.

I went looking for a tool that could do this in one place. Something that would let me run different calculations using the same, up-to-date business data. Something that connected to my accounting software so I wasn't manually copying numbers.

I found plenty of free online calculators. They were fine for one-off math, but they didn't know anything about my business. Every time I used one, I started from zero. No memory. No context. No connection to my other numbers.

I found enterprise financial planning software too. It was powerful but built for companies with finance teams, not solo operators and small crews. And the pricing reflected that.

The tool I needed, something in between, something built for actual small business owners, didn't exist.

So I started building it.

What KnowYourNut Is

KnowYourNut is a small business financial calculator suite, but calling it that undersells what it does. It's closer to a financial operating system: one place where all your numbers live, connect, and make sense together.

Here's what's inside:

33 financial calculators covering the things small business owners actually need to figure out. Break-even analysis. Profit margin. Cash flow forecasting. Burn rate and runway. Business valuation. SBA loan planning. Quarterly tax estimates. Markup vs. margin (because too many people confuse the two and it costs them money). Employee true cost. ROI. ROAS. Customer acquisition cost. Depreciation. And about 20 more.

Every calculator exports to PDF. Hand it to your accountant, your bank, your business partner.

QuickBooks integration lets you sync your books. Once connected, your calculators pull actual revenue, actual expenses, actual data, not your best guess from last quarter.

Scenario comparison lets you save different what-if analyses and look at them side by side. "What if I raise prices 12%?" next to "What if I drop my lowest-margin service?" See the impact before you commit.

AI-powered insights analyze your numbers and surface things you might miss. Cash flow trending down? Margins compressing? Tax deadline approaching? You get a flag, not a surprise.

Push alerts keep the important stuff in front of you. Cash flow warnings. Tax payment reminders. The financial equivalent of a check-engine light.

And we have 50+ industry pages with benchmarks tailored to specific business types, because a healthy margin for a restaurant looks nothing like a healthy margin for a consulting firm.

The Living Memory Concept

The feature I'm most proud of is something we call Living Memory.

It solves the core problem I had with spreadsheets: disconnected data.

When you set up your business profile in KnowYourNut, you enter your key numbers once. Monthly rent. Revenue. Payroll. Insurance. Loan payments. The basics of your business.

That profile becomes the foundation for every calculator on the platform. When you open the break-even calculator, your fixed costs are already there. When you check your burn rate, your expenses are populated. When you run a cash flow forecast, it starts with real numbers, not blanks.

Change your rent? It updates across every relevant calculation. Add an employee? The cost ripples through break-even, cash flow, burn rate, and margin calculations automatically.

This is what I mean by "financial operating system." It's not 33 separate tools. It's one connected system that understands your business.

And when you connect QuickBooks, Living Memory gets even stronger. Your profile stays current with real financial data. No manual updates. No stale numbers in forgotten spreadsheets. Your calculators are always working with what's actually happening in your business, not what you thought was happening three weeks ago.

Who It's For

I built KnowYourNut for the business owner who knows they should understand their finances better but doesn't have the time or the tools to make it easy.

The landscaper who prices jobs by gut and wonders why some months are tight. The freelancer who forgets to set aside money for quarterly taxes until the deadline is a week away. The restaurant owner who knows food costs are climbing but can't pinpoint exactly where the margin is going. The e-commerce seller running ads who has no idea what their actual customer acquisition cost is.

If you run a business with fewer than 50 employees, this was built for you.

You don't need a finance degree. You don't need to understand accounting terminology. You need to know your numbers, and you need a tool that makes knowing them easy instead of painful.

What It Costs

The free tier includes all 33 calculators and a basic business profile. No credit card. No 14-day trial. No feature walls on the calculators themselves. It works.

Pro is $9.99 per month, or you can grab a lifetime option. Pro adds QuickBooks integration, scenario comparison, AI insights, push alerts, and PDF exports.

I priced it that way because I know what it's like to spend money on software you're not sure about. The free tier should prove the value before you spend a dollar.

The Bottom Line

I built KnowYourNut because I was the customer who needed it. I was the veteran running a business on spreadsheets and intuition when I should have been running it on real data and connected tools.

Knowing your nut isn't just about one number. It's about understanding how every part of your finances connects. How a rent increase affects your break-even. How a new hire changes your burn rate. How a pricing change ripples through your margins.

That's what KnowYourNut does. It connects the dots so you can stop guessing and start deciding.

Try it free at knowyournut.com 🥜

FAQ

What problem does KnowYourNut solve?

Most small business financial tools are either too simple (standalone calculators that don't connect to each other) or too complex and expensive (accounting software built for accountants, not owners). KnowYourNut sits in the middle: free interconnected calculators that share data through a single business profile, so changing one number updates everything else automatically.

Is KnowYourNut free to use?

All calculators are free with no account required. Creating a free account unlocks the Living Memory feature, which saves your inputs and syncs them across every calculator. Pro features, including the AI Financial Advisor, PDF exports, and scenario comparisons, are available for $19 per month or $149 lifetime.

Who is KnowYourNut built for?

Small business owners who run their own finances, not their accountant. The tools are designed to be used by someone who knows their business but doesn't have a finance degree: a plumber figuring out if they can afford a new truck, a restaurant owner calculating whether a price increase is worth it, or a freelancer trying to figure out what quarterly taxes to set aside.

What makes it different from a spreadsheet or NerdWallet?

A spreadsheet requires you to build and maintain the connections between calculations yourself. NerdWallet's calculators are general-audience tools with no memory between sessions. KnowYourNut's calculators are built specifically for small business use cases and share a live business profile, so your revenue, fixed costs, and margins are always current across every tool you use.

Can I connect my accounting software to KnowYourNut?

Yes. Pro accounts can connect QuickBooks Online, which feeds real P&L data into the dashboard and AI advisor. Plaid integration is also available for bank account cash flow visibility. The goal is to give small business owners the same financial picture a CFO would have, without the CFO price tag.