About 3BN
Calculators for the people who run the numbers.
3BN.net brings you easy to use, private and professional, business calculators. Behind every sales quote sits a small mathematical drama. There is the cost the operations team protects. The list price marketing publishes. The discount a salesperson wants to grant. The margin finance must defend. The commission the rep will earn at the close. Each number tugs at the others, and someone, in some browser tab, has to make the math resolve before the proposal goes out. 3BN is the place where that resolution happens.
What 3BN Is
3BN is a free, browser-based calculator suite built for sales operations, finance, and pricing teams. The 3BN suite covers six calculators that handle the recurring quantitative work of B2B revenue: percentage, margin and markup, return on investment with payback period, pricing waterfall, break-even analysis, and the LTV:CAC ratio with associated unit economics.
Each 3BN calculator opens to a clean interface, performs every computation locally inside the browser, and presents results in a layout that reads cleanly when pasted into a Slack thread, a quote document, or a board memo. A single button copies an approval-ready summary to the clipboard.
3BN Business Calculators
3BN Percentage Calculator
Seven modes cover the moments when a percentage question shows up in everyday revenue work. Mode one calculates a percentage of a value. Mode two answers the inverse question, where one value is expressed as a percentage of another. Mode three computes percentage change between a starting and ending figure. Mode four handles tax and VAT, computing the gross figure from a net amount and a tax rate. Mode five resolves sales commission from deal size and commission rate. Mode six runs compound growth across periods. Mode seven applies a sequential chain of percentage changes to a starting value and exposes the difference between true compounded outcome and the deceptive sum a salesperson might quote when stacking discounts.
3BN Margin and Markup Calculator
Four modes serve the moment a sale price needs verification before it leaves the building. Margin mode takes cost and sale price and returns gross margin alongside the equivalent markup on cost. Markup mode takes cost and a target markup percentage and returns the resulting sale price. Discount mode takes an original price and a discount percentage and returns the final price plus the absolute saving. Price increase mode takes a current price and an increase percentage and returns the new price.
3BN Return on Investment (ROI) and Payback Calculator
Eight inputs span the variables that matter when finance evaluates an investment. The investment cost. The implementation time, expressed in months. Expected monthly savings. Expected monthly revenue lift. Evaluation horizon, in months. Ongoing monthly cost. Target payback, also in months. Six presets calibrate every input for common investment archetypes, including a typical SaaS deployment, a process automation project, a new hire, an external agency engagement, a CapEx-style energy retrofit, and a marketing campaign. Output reports ROI as a percentage, payback period in months, total benefit, net gain, performance against the target payback, and a verdict badge that reads at a glance.
3BN Pricing Waterfall Calculator
The waterfall walks a deal from list price down through every leakage point until realized margin appears at the bottom. List price sits at the top. Customer discount comes off first, with the running subtotal shown alongside the percentage of list at that stage. Channel or partner margin comes off next. Services credit and onboarding credit come off after that. The line marked net invoice records what the customer actually pays. Sales commission then comes off the net invoice, and COGS comes off after that. The final row reports realized margin in absolute currency and as a percentage of list. A single explanatory line below the waterfall states the total leakage, where leakage equals list price minus realized margin. Pricing teams use the waterfall during quote review. Finance teams use the same waterfall during deal desk approvals and quarterly leakage post-mortems.
3BN Break-Even Analysis Calculator
Five inputs produce a complete unit economics picture. Fixed costs, selling price per unit, and variable cost per unit produce break-even units, break-even revenue, contribution per unit, and contribution margin as a percentage of price. Adding a target profit reveals the units required to clear that profit alongside the fixed cost coverage. Adding expected unit sales produces a margin of safety percentage, which tells the operator how far forecast volume sits above break-even. Operations teams use the break-even calculator before factory commitments. Founders use the same calculator before quoting a fixed-price contract.
3BN Customer Lifetime Value and Customer Acquisition Cost Calculator (LTV : CAC)
Four inputs translate subscription unit economics into a verdict. ARPU per customer per month. Gross margin percentage. Monthly churn percentage. Customer acquisition cost in currency. Output reports customer LTV, average lifetime in months, the LTV:CAC ratio expressed as a colon-separated comparison, CAC payback period in months, and a unit-economics health badge that reads Healthy, Watch, or Underwater. The verdict thresholds follow the conventions that SaaS investors and CFOs already recognize, where a ratio at or above three to one with payback under twelve months reads as healthy.
How 3BN Works
3BN runs on the browser already open in front of the user. The page loads once, and from that moment, every keystroke triggers a recalculation that completes inside the local JavaScript engine. The result writes back to the screen the same instant the math finishes. There is no submit button, no spinner, no round trip.
For shareable links, every 3BN calculator carries a permanent URL. Visiting 3bn.net/margin opens the suite directly on the margin calculator. Visiting 3bn.net/waterfall opens it on the pricing waterfall. Sending a colleague the URL of a specific calculator opens that colleague directly into the right tool.
Privacy by Architecture
Every value typed into 3BN remains on the device of the person typing. The architecture is the privacy guarantee, and every visitor can verify the architecture in real time.
Open the network tab in the browser developer tools. Run any calculation. The network panel shows requests for the page, the stylesheets, the fonts, and the daily feature imagery. The network panel shows zero outbound requests carrying the deal sizes, commission rates, churn percentages, or any other figure entered into the calculator inputs. Local processing means local processing.
For pricing and finance teams handling unannounced commercial figures, this matters. The numbers belong to the company that owns them, and 3BN is engineered so the numbers stay that way.
Approval-Ready Output
Every 3BN calculator carries a copy button labeled [Copy Calculation Summary]. A single click writes a clean, structured Markdown summary to the clipboard. The summary opens with the calculator name and the date of generation. The next block lists the inputs. The block after that lists the results, with the headline figure rendered in bold. The summary pastes intact into Slack threads, into Notion documents, into Microsoft Word, into the body of a CFO email.
Sales operations leads use the summary inside deal desk threads. Pricing analysts paste the summary into quote review documents. Finance teams archive the summary alongside investment approval records. The summary serves as the working artifact that connects the math to the decision the math supported.
Who Uses 3BN
A pricing analyst at a software company validates quote margins at 3BN before the rep sends them to the prospect. The analyst opens the margin calculator, drops in the cost and the proposed sale price, and confirms the gross margin clears the company floor before greenlighting the quote.
A finance lead at a manufacturer runs break-even on a new SKU at 3BN before the factory commitment locks in. Fixed costs, unit price, and variable cost produce break-even volume in seconds, and the margin of safety figure tells leadership how much room the forecast holds.
A sales operations manager models commission scenarios at 3BN for a quarterly compensation revamp. Deal sizes and commission rates feed the percentage calculator, and the resulting payouts inform the new comp plan structure.
A founder pitching investors prepares LTV:CAC math from the previous month of revenue data at 3BN. ARPU, gross margin, churn, and CAC produce the ratio, the lifetime, and the payback period that investors expect to see on slide twelve of any subscription business deck.
A revenue operations director proves payback on a marketing automation purchase. The 3BN ROI calculator carries a marketing preset that calibrates the inputs for fast deployment, revenue-driven uplift, and a short acceptable payback. The verdict badge then carries the recommendation to the buying committee.
A consultant building a board pack for a portfolio company tests pricing leakage on the largest enterprise renewals at 3BN. The waterfall calculator walks each deal from list to realized margin, and the leakage figures inform the renewal strategy memo.
A franchise operator computes pricing waterfalls for a regional rollout at 3BN. List price, channel margin to the franchisee, and fulfillment costs feed the waterfall. The realized margin per location informs the rollout pace.
3BN is Available in Many Languages
3BN ships with localized interfaces across many world languages. The 3BN language selector in the navbar opens a directory of supported translations, with right-to-left languages mirroring the layout direction automatically. Each language version carries its own structured set of pages, where the canonical calculator routes remain accessible across translations.
3BN is Free, No Accounts, No Friction
3BN requires zero accounts, zero registration, zero email collection, and zero payment. Every calculator, every preset, every translation, and every share link is available to every visitor from the first moment. Theme preference saves to the local browser through standard browser storage on the device. Every other interaction begins fresh and ends with the closing of the browser tab.
Legal Information
For operator identification and contact details, please refer to the 3BN Impressum. You may also review the 3BN Privacy Policy and the 3BN Terms of Use.
