PROFITTHEORY

Start with the numbers

Free calculators. No email required.

Results appear instantly on the page. We show our formulas and assumptions so you can trust the math.

Business loan payment calculator

Monthly payment, total interest and a yearly amortization schedule.

SBA 7(a) loan calculator

10-year business and 25-year real estate payment presets.

SBA loan payment calculator

Estimate SBA payments by amount, rate and term.

Equipment financing calculator

Monthly payment on an equipment loan.

Working capital calculator

Cash tied up in collections and what it costs.

Cash flow & runway calculator

How long your cash lasts.

Practice loan calculator

Vet, dental and medical presets: payment, DSCR and break-even collections.

Seller financing calculator

Seller note plus bank or SBA loan: payments, balloon, blended DSCR.

Sources and uses calculator

Deal costs vs funding sources: funding gap and equity %.

Partner buyout calculator

Buyout payment and DSCR including existing debt.

Acquisition DSCR planner

Does the deal's cash flow cover the new debt?

Merchant statement breakdown

Effective rate and who gets each fee dollar: issuer, networks, provider and fixed fees.

Surcharge impact calculator

Should you pass card fees to customers? Net impact and break-even sales loss.

Cash discount vs surcharge

Absorb, surcharge or cash discount, compared side by side.

Pricing model comparison

Flat, tiered and interchange-plus on the same volume, with switching payback.

Loan offer comparison

Compare amounts, rates, terms, fees, estimated APR and total cost side by side.

Processing fee calculator

Your blended effective rate, fee per sale and annual cost.

Financing plan builder

Pick your industry and goal for a tailored draft plan and lender-package checklist.

DSCR & leverage calculator

Debt service coverage, debt-to-EBITDA and the max loan your cash flow supports.

Interest cost & coverage

Total interest, interest as % of loan and EBIT ÷ interest — with a rate stress test.

How long should I finance?

Compare 3–25 year terms against the useful life of what you're buying.

Startup cost & runway calculator

How much cash you need and how long it lasts.

Fixed vs. variable stress test

Payment after a rate reset and the breakeven rate move.

Debt vs. equity model

Dilution vs. loan payments, with a downside test.

Practice + real estate debt

Both payments together and combined DSCR.

Payment stack cost

Processing, software and staff time — your all-in cost of getting paid.

A/R collection lag

Days to collect and the cash tied up in balances.