Owner Math

For service businesses, shops and offices

Before you open, buy or grow a business, know its math.

You want to hire, raise prices, sign a lease or buy a business from its owner. Your spreadsheet counts a new hire at the wage alone. It leaves out the payroll taxes the law adds, so the hire looks cheaper than it is. Owner Math builds your month from your prices, your jobs and your staff, and shows the math on every line. A cost you have not given stays a dash, not a zero.

The demo is free, with no account and no card. It is built for a laptop. On a phone you can read your numbers, but build the model on a computer.

What if you hire one more technician?

Florida · 40 hours a week · the same payroll math as the app, running in your browser

Pay an hour

What one hour really costs you

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How it adds up, per year

  1. Working out the example…
The comp quote of $5.00 per $100 of pay is an example. Put in your insurer's rate in the app. Planning estimate. Not tax advice.

§ 01 — Start, buy or run

One tool for every stage of your business.

Start a business
Model it before you sign a lease or buy a truck. Add your prices, your jobs or sales, your staff, the rent and the loans. See the monthly profit, break-even and payback.
Buy a business
Check the seller's numbers before you pay. Upload their profit and loss as an Excel or CSV file and answer a few plain questions. You see what the business really earns for you and whether it can carry the loan. Our free guide to buying a restaurant walks through the same checks.
Run your business
Close each month with your real sales, payroll and bank numbers, and see them next to the plan. Before you change something, try it first.

§ 02 — Who it fits

Built for the businesses a spreadsheet gets wrong.

Trades and home services
Heating and air, plumbing, electrical, lawn care. Price each kind of job, count the hours a tech can bill, and add the trucks, fuel and parts markup.
Cleaning, salons and auto repair
Crews, chairs or bays. See what each person costs with the payroll taxes in, and what each hour of work has to bring in.
Shops
Sales, what the goods cost you, staff and rent. See the margin you keep and the sales you need each month to break even.
Offices and professional services
Billable hours, rates, staff and overhead. See what an empty hour costs you.
Any other business
Start from a blank model and add your own lines. The same rules hold: every number shows its math, and a blank stays a dash.

§ 03 — Bring what you already have

Start from your own files, not a blank form.

Upload your spreadsheets

Excel or CSV files: a seller's profit and loss, your sales, your payroll, your bank statement.

Try it with no account

The free demo needs no account and no card. Your model is stored in your browser, on this computer, until you choose to buy.

What if?

Add an employee, with the payroll taxes counted. Costs go up 8%. You raise prices. The landlord asks for more rent. See what each does to profit and break-even, then apply it or undo it.

Bring your own AI agent

Connect the AI you already use, like Claude or ChatGPT. It reads your real months and suggests fixes. It cannot change your plan by itself. You approve each change, and you can undo it.

How to connect it, and what it cannot do

Planning estimate — not tax advice. Your CPA reviews and files.

When you are ready, export a packet for your CPA or your lender: your plan laid out line by line, with the math behind each number.

§ 04 — Pricing

Pay once. Yours for good.

No subscription. No monthly bill. One payment gets you everything, for every location you have, for as long as you want it.

Free demo

For looking hard before you leap.

$0

No account. No card.

Open the free demo
  • The examples, and a full model of one location
  • Demo mode, with the math on every line
  • Saved in your browser, on this computer
  • Export and import your model as a file

Lifetime access

Business

For starting, buying or running your own business.

$199once

One payment. Nothing billed again. 30-day money-back guarantee, until you export a finished packet.

  • Start: your own business, saved to your account, on any computer
  • Buy: check a seller's spreadsheets and what the business earns for you
  • Run: close each month and see the real numbers next to your plan
  • What if? A new hire with payroll taxes, costs going up, a price change, rent
  • Any number of locations and models
  • Packets for your bank and your CPA
  • Bring your own AI agent: it checks your numbers and suggests changes, and you approve each one
  • Every future update

Both products

For an owner with a restaurant and another kind of business, or both in mind.

$299once

Restaurants and Business together, for less than two. Same 30-day money-back rule.

  • Everything in both products
  • Any number of locations of each
  • One license key for both

Already own Owner Math for Restaurants? Add this one for $100, paid once. Sign in and add it from your account.

After you pay, we email you a license key. Paste it into the app to sign in. Not right for you? Email us within 30 days of buying and we refund the full amount, unless you have exported a finished packet (CPA, lender, investor or filing). Exporting one ends the refund window. If you refund an add-on, only that product is removed. See Refunds.

§ 05 — Questions

Straight answers.

Is this tax advice?

No. It is a planning estimate. Every tax rate shows its year and its source, and you can change any of them. Your CPA reviews and files.

I run a restaurant. Is this the right one?

No. Restaurants have their own product, built from the menu up. See Owner Math for Restaurants. If you run both kinds of business, buy both together for less.

Where is my data kept?

In the free demo, your model is stored in your browser, on this computer. It is not sent to our server. After you buy, your models are also saved to your account, so you can open them on any computer. You can export a file at any time.

Does it work on my phone?

It is built for a laptop or desktop. On a phone you can read your numbers, but building a model needs a bigger screen and a keyboard.

Does it work outside Florida?

Florida payroll taxes are filled in. Some other states have rates loaded. For a state we have not checked, a rate shows as missing until you enter it. We never slip in a guess.

What if it is not right for me?

Email us within 30 days of buying and we refund the full amount, unless you have already exported a finished packet. Exporting one ends the refund window.

Does it run payroll or do my books?

No. It is a planning tool. It does not pay anyone, file anything or replace your bookkeeping.

Run the numbers tonight, before you hire, buy or sign.