Docutoolbox · 15 tools

Financial & Business Calculators

Loans, mortgages, interest, taxes, profit margins, and more, all free, all in your browser, with no sign-up.

Loan Calculator Live
Payment, interest, and full schedule for amortized loans, deferred loans, or bonds.
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EMI Calculator Live
Find your equated monthly installment for a home, car, or personal loan.
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Mortgage Calculator Live
Total monthly home payment including tax, insurance, PMI, and HOA fees.
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Compound Interest Calculator Live
See how savings grow over time, with optional regular contributions.
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Simple Interest Calculator Live
Solve for interest, principal, rate, or time using the simple interest formula.
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Currency Converter Soon
Convert between world currencies using live exchange rates.
Crypto Profit / Loss Calculator Soon
Work out your profit or loss from a cryptocurrency buy and sell price.
VAT / GST Calculator Live
Add tax to a net price, or pull the tax back out of a gross price.
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Inflation Calculator Live
Find what an amount from one year is worth in another year.
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Profit Margin & Markup Calculator Live
Find your selling price, margin, markup, or cost from any two values.
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Break-Even Point Calculator Live
Find how many units you need to sell to cover your costs.
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Net Present Value (NPV) Calculator Live
Find the present value, IRR, and payback period of an investment.
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Paycheck Tax Deductions Calculator Soon
Estimate take-home pay after tax deductions from a paycheck.
Freelance Hourly Rate Calculator Live
Find what to charge per hour based on your income goal and expenses.
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Savings Goal Calculator Live
Find how much to save each month to hit a target, or how long it will take.
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What are Docutoolbox's Financial & Business Calculators?

This is a growing collection of free, browser-based calculators for the money decisions people and small businesses run into most often: taking out a loan, understanding an investment, pricing a product, planning savings, or checking whether a business idea breaks even. Every calculator here runs instantly and entirely on your own device.

There's no software to install, no account to create, and no limit on how many times you can use any tool.

What each calculator does

More tools, including a live currency converter and crypto calculator, are in active development and will appear here as they're finished.

How to choose the right calculator

If you're borrowing money, the Loan, EMI, or Mortgage calculators cover the most common structures. For growing savings or understanding interest, the Compound and Simple Interest calculators handle both directions. For running a business, the Profit Margin, Break-Even, and NPV calculators cover pricing and investment decisions, while the Freelance Rate calculator is built specifically for setting an hourly rate. For everyday money questions, VAT/GST, Inflation, and Savings Goal cover common personal finance calculations.

Is it really free?

Yes, every tool on this page is completely free, with no usage limits and no account required.

Frequently asked questions

Do I need to install anything?

No, every calculator runs directly in your web browser.

Is my financial data stored or sent anywhere?

No. All calculations happen locally in your browser using JavaScript. Nothing you enter is transmitted to a server or saved anywhere.

Are these calculators a substitute for professional financial advice?

No, they're designed to help you understand and estimate common financial calculations, but for decisions involving significant money, taxes, or legal commitments, it's always worth consulting a qualified financial advisor, accountant, or lender for guidance specific to your situation.

Can I use these calculators on my phone?

Yes, every calculator is fully responsive and works on any modern phone, tablet, or desktop browser.