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Free Online Calculators & Converters

10 essential tools for finance, health, and everyday life. No sign-up, no data stored, instant results.

✓ 100% Free ✓ No registration ✓ No data stored ✓ Mobile friendly
Finance Calculators

Calculate salaries, taxes, loans, and investment returns.

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Salary Calculator
Convert net to gross salary. Full breakdown of income tax and social contributions.
Finance
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VAT / Tax Calculator
Add or remove VAT from any price. Supports all countries and all VAT rates.
Finance
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Percentage Calculator
5 modes: find X% of Y, percentage change, discounts, markups and more.
Finance
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Loan Calculator
Monthly payments, total interest, and full cost breakdown for any loan.
Finance
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Compound Interest Calculator
See how investments grow with compound interest and monthly contributions.
Finance
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Mortgage Calculator
Monthly payment, total interest, and full cost breakdown for any home loan.
Finance
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Currency Converter
Live exchange rates for 30+ world currencies. Updated daily.
Finance
Unit Converters

Convert between units used around the world.

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KG to LBS Converter
Convert kilograms to pounds and back. Also shows stones, grams, and ounces.
Converter
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Celsius to Fahrenheit
Instant temperature conversion between °C, °F, Kelvin, and Rankine.
Converter
Date & Time Tools

Calculate ages, durations, and time between dates.

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Age Calculator
Exact age in years, months, days, and hours. Shows next birthday countdown.
Date & Time
Time Duration Calculator
Calculate the duration between any two dates and times in all units.
Date & Time
Security Tools

Stay safe online with strong, random passwords.

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Password Generator
Generate cryptographically secure passwords up to 64 characters. Browser-based, nothing stored.
Security

About CalcTools

CalcTools is a collection of free, fast, and accurate online calculators and converters. Every tool works directly in your browser — no account required, no data collected, no cookies tracking you.

Our tools are designed to be genuinely useful: clear inputs, instant results, and plain-English explanations so you understand not just the answer but how it was calculated. Whether you are checking a salary offer, working out tax on an invoice, planning a loan, or converting units for a recipe, CalcTools gives you accurate results in seconds.

All calculators use standard mathematical formulas verified against official sources. For legal, financial, or medical decisions, always verify results with a qualified professional.