Know the numbers before you commit.
Twenty-seven professional calculators for buying a business, financing it, and managing the money around it — acquisition underwriting, valuation, debt coverage, mortgage, tax, investing and payoff planning.
Is this business worth buying?
A full acquisition underwriting suite — valuation against industry multiples, SBA financing and DSCR, cash-on-cash ROI, the maximum price you can support, downside scenarios and a printable deal memo.
Open the platformBusiness & Acquisitions
8 toolsDeal Analyzer
Full underwriting model — coverage, returns, five-year projection, exit IRR and a weighted deal score.
AnalyzeBusiness Valuation
SDE, EBITDA, revenue and discounted cash flow methods reconciled into one defensible range.
Value itFinancing & DSCR
Build the capital stack, compare SBA terms, and see the coverage ratio a lender will calculate.
StructureOffer Optimizer
The highest price that still clears your coverage and return targets, plus a full price ladder.
Price itScenarios & Sensitivity
Five stress cases from severe downside to strong upside, plus a grid showing where the deal breaks.
Stress-testIndustry Multiples
SDE multiple ranges and typical margins across 25 sectors, with what moves a business up its band.
CompareMy Deals
Every deal you save, side by side on the same underwriting metrics. Stored in your browser only.
OpenDeal Memo
A one-page underwriting summary ready to print, save as PDF, or hand to a partner or lender.
GenerateMortgage
6 toolsMonthly Payment
Your exact PITI payment including principal, interest, property tax and insurance.
CalculateHome Affordability
Maximum home price based on your income and the 28/36 debt-to-income rule.
CalculateRefinance Break-Even
How many months it takes to recoup the closing costs on a refinance.
CalculatePMI Removal Date
When you reach 20% equity and can finally cancel private mortgage insurance.
CalculateClosing Costs
Total cash needed at closing beyond the down payment, itemised line by line.
CalculateAmortization Schedule
Full year-by-year breakdown of principal versus interest over the life of the loan.
CalculateTax
4 toolsTake-Home Pay
Net salary after federal, state, Social Security and Medicare taxes.
CalculateSelf-Employment Tax
SE tax, quarterly estimates and your true net income as a freelancer.
CalculateCapital Gains Tax
Federal tax owed on short-term and long-term investment gains.
CalculateW-4 Estimator
Set your withholding correctly and avoid a surprise bill in April.
CalculateInvesting
5 toolsCompound Interest
Year-by-year growth with regular contributions and compounding returns.
Calculate401(k) Calculator
Projected retirement balance including your employer match and long-term growth.
CalculateRoth IRA
Tax-free retirement balance, and how it compares against a traditional IRA.
CalculateFIRE Number
How much you need invested to retire early, using the 4% safe withdrawal rule.
CalculateDividend Yield
Annual dividend income and how a reinvested portfolio grows over time.
CalculateDebt & Savings
4 toolsLoan Payoff
What extra payments really save you, shown side by side against the original schedule.
CalculateSnowball vs. Avalanche
Which payoff strategy clears your debt fastest, and which saves the most interest.
CompareSavings Goal
Time needed to reach any target, or the monthly contribution required to get there.
CalculateEmergency Fund
Your three-to-six month safety net target, and a realistic plan to build it.
CalculateThree steps, no account
Nothing to install, nothing to sign up for, and nothing sent to a server. Pick the question you need answered and the numbers follow.
Find the right tool
Search or pick a category from the sidebar. Twenty-seven calculators covering acquisitions, mortgage, tax, investing and debt.
Enter your numbers
Every field recalculates the model instantly. No submit button to hunt for, no page reloads, no waiting on a server round-trip.
Get a real answer
Not just a figure — coverage ratios against lender thresholds, downside scenarios, and a printable memo you can hand to a partner.
Why the numbers here hold up
Built to the standards a lender, broker or accountant would apply — not simplified for the sake of a prettier result.
Real lender math
SDE and EBITDA multiples, SBA 7(a) structures, the 1.25× DSCR threshold, standard amortization and 2025 federal brackets.
Nothing leaves your browser
Every calculation runs locally. Saved deals are written to your own browser storage and are never uploaded to us or anyone else.
No account, ever
No sign-up wall, no free trial that expires, no email capture before you see a result. Open the page and use it.
Built for one job
Business and finance only. No unit converters or novelty tools — every calculator here is for buyers, owners and investors.
Common questions
Is CalcNest really free?
Is my data sent anywhere?
Can I use these for a loan application or tax filing?
Where do the industry multiples come from?
What is SDE, and why does it matter more than profit?
Do you cover anything outside business and finance?
Built for business buyers, owners and investors
CalcNest is a focused set of business and finance calculators. Every one uses the same arithmetic that banks, lenders, brokers and the IRS use — not simplified approximations. Results appear instantly as you type, nothing is sent to a server, and no tool has ever required an account.
The acquisition tools follow standard lower-middle-market underwriting: SDE and EBITDA multiples, SBA 7(a) structures, and the 1.25× debt service coverage threshold lenders actually apply. The tax calculators are current for 2025 federal brackets, long-term capital gains rates and the Social Security wage base. The investment calculators compound monthly rather than annually, which matters more than most people expect over a thirty-year horizon.
Start with the question, not the calculator
- Should I buy this business? — the Deal Analyzer underwrites price, financing, coverage and return in one model
- What is it worth? — Business Valuation reconciles SDE, EBITDA, revenue and DCF against the industry band
- Will a lender approve it? — Financing & DSCR shows the coverage ratio before you apply
- What should I offer? — the Offer Optimizer solves for the highest price that still clears your targets
- What can I afford personally? — Home Affordability works backwards from income using the 28/36 rule
- When can I stop working? — the FIRE Number applies the 4% safe withdrawal rule
- Which debt do I clear first? — Snowball vs. Avalanche compares both strategies on your real balances
The acquisition platform
The Deal Intelligence platform is the core of CalcNest. It answers the questions a buyer actually faces — what the business is worth against its industry multiple band, how much cash you need at closing, whether operating cash flow covers the loan payments at the threshold lenders require, what return you earn on the money you invested, how far revenue can fall before the deal is in trouble, and the maximum price you can justify paying.
Model a deal once and it carries across every tool: value it, structure the debt, stress-test the downside, find your ceiling, then print a one-page memo for a partner or lender.