Know your numbers. Make better decisions.

Free financial calculators built for founders, freelancers, and small business operators. Use them directly in your browser — most require no account at all.

Our Mission

Small business owners make dozens of financial decisions every week — pricing, hiring, debt payoff, software subscriptions, payment processors.

Most of those decisions get made on gut feel. The tools that could help are either locked inside expensive software, buried in spreadsheets, or so generic they don't apply to your actual situation.

Our goal is to change that. Every calculator on this site is built around decisions real operators actually face — with transparent formulas, plain-language outputs, and no finance degree required.

What We Solve

Most online financial tools fall into one of three traps: too simple to be useful, too cluttered to be readable, or they show a number without explaining what it means for your business.

Knowing your gross margin is 42% doesn't help if you don't know whether that's good for your industry — or what happens to it if you raise prices by 10%.

Every tool here shows its working, explains outputs in context, and connects to related calculators so you can follow a decision through its full financial chain — not just see one number in isolation.

Who It's For

Built for operators who run their business themselves — not for enterprise finance teams with dedicated analysts.

Freelancers pricing services and tracking profitability
Ecommerce sellers calculating processor fees and margins
SaaS founders modeling MRR, churn, and breakeven
Agencies managing payroll, overhead, and contractor costs
Solo operators planning cash flow and managing debt
Startup founders projecting runway for investors

How We Build

Every calculator follows the same principles: inputs kept to the minimum needed for a useful answer, outputs explained in plain language, formulas always visible.

Results connect to related tools so you can keep pulling the thread. Six categories cover the full range of small business finance: payment processor fees, debt and loans, business costs, ROI and growth, cash flow, and subscriptions and SaaS metrics.

Each one is built around the questions operators actually search for when making a real decision — not textbook finance theory.

Popular Calculators

Stripe Fee Calculator Payments
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Burn Rate & Runway Calculator Cash Flow
Debt Snowball vs Avalanche Debt & Loans
SaaS Stack Cost Estimator Subscriptions
Customer Lifetime Value ROI & Growth
Customer Acquisition Cost ROI & Growth

Built By

FinanceCalculatorTools is powered by StunningBuilds.com, which designs and builds custom financial tools, calculators, and websites for businesses.

If you run a platform, agency, or service business and want a white-label version of any calculator on this site — or a custom tool built around your product — StunningBuilds.com builds exactly that.

Start with the Health Check

Not sure where to begin? The Financial Health Check runs a full diagnostic across your margins, cash flow, burn rate, and debt in one session — and points you to the areas that need the most attention.