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Business tools

Financial calculators for margin, marketing, and growth

Run the numbers that actually drive decisions. This suite puts eighteen business calculators in one place, from gross and net margin to CAC, LTV, ROAS, and CAGR. Pick a calculator, enter your figures, and see the result and the formula behind it, so you know
not just the answer but how it was reached.

Eighteen business calculators, each on its own page with the formula, a worked example, and a plain reading of what the number actually tells you. Everything runs in your browser and every result can be shared as a link.

Start with the question

What should I charge for this?

Price from cost and marginMarkup to marginDiscount and markdown

Am I actually making money on this?

Gross profit marginNet profit marginBreak-even point

Is this campaign working?

Return on ad spend (ROAS)Customer acquisition cost (CAC)Customer lifetime value (LTV)LTV to CAC ratioConversion rateCost per click (CPC)Cost per thousand (CPM)

Was this worth doing, and did it pay off?

Return on investment (ROI)Payback periodCompound annual growth rate (CAGR)Compound interestPercentage change

Every calculator in the suite

Each one has its own page with the formula, a worked example, and notes on where the number misleads.

Margin and pricing

Gross profit marginWhat share of revenue is left after cost of goods sold.Net profit marginWhat share of revenue is left after every cost.EBITDAEarnings before interest, taxes, depreciation and amortization, and the margin it leaves.Markup to marginConvert a markup percentage into the margin it produces.Price from cost and marginSet a selling price that hits your target margin.Break-even pointUnits and revenue needed to cover fixed costs.Discount and markdownSale price, and what the discount costs your margin.

Marketing and acquisition

Return on investment (ROI)The percentage return you earned on what you spent.Return on ad spend (ROAS)Revenue earned for every unit of ad spend.Customer acquisition cost (CAC)What it costs to win one new customer.Customer lifetime value (LTV)Total revenue expected from an average customer.LTV to CAC ratioHow lifetime value compares to acquisition cost.Cost per thousand (CPM)What you pay for a thousand ad impressions.Cost per click (CPC)Average cost of a single ad click.Conversion rateShare of visitors who took the action you wanted.

Growth and return

Compound annual growth rate (CAGR)The smoothed yearly growth rate between two values.Percentage changeIncrease or decrease from one value to another.Compound interestFuture value of a balance that compounds each period.Payback periodHow long an investment takes to pay for itself.

No calculator matches that search. Try a broader term such as margin, cost, or growth.

Common questions

What is the difference between margin and markup?

Margin is profit as a share of the selling price. Markup is profit as a share of the cost. A 50 percent markup is a 33.3 percent margin, which is why the two are so often confused in pricing decisions.

Which calculator should I use to judge an ad campaign?

ROAS for the immediate revenue return, CAC for what a customer costs to win, and LTV to CAC for whether that cost is sustainable. Read them together rather than one at a time.

Are these calculators free to use?

Yes. Every calculator runs in your browser, nothing is sent to a server, and no account is required. Results can be shared as a link that reopens with your figures filled in.

Other tools on this site

UTM builderTag campaigns so the numbers above have something to measure.Color contrast checkerTest text and background pairs against WCAG thresholds.QR code generatorMake a scannable code for a link, no watermark or expiry.Markdown editorWrite, preview, and convert between Markdown and HTML.

Numbers are the easy part

Getting the calculation right takes two inputs. Getting an organization to agree on what counts as gain, what counts as cost, and what the number should change takes considerably longer.

That translation work is most of what I do. Westphal Solutions builds websites, tools, and reporting for nonprofits and growing teams, including the kind of measurement setup that makes a number like this one worth trusting in the first place.

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