Free Online Calculators & Converters
98 free tools across 8 categories. All calculations run instantly in your browser — no login, no tracking, no ads.
12 calculators for arithmetic, algebra, and number theory.
12 tools Unit Converters19 converters for temperature, length, weight, area, speed, time, data, energy, and more.
19 tools Finance & Money12 calculators for interest, loans, tax, salary, ROI, and investment.
12 tools Health & Fitness10 calculators for BMI, BMR, TDEE, body fat, calorie burn, and more.
10 tools Cooking & Automotive8 tools for recipe scaling, cooking units, fuel efficiency, and tire sizes.
8 tools Electrical & Engineering7 calculators for Ohm's law, resistors, capacitors, decibels, and torque.
7 tools Number Systems & Geometry13 tools covering binary/hex/octal, ASCII, geometry, and trigonometry.
13 tools Date, Text & Color17 utilities for date calculations, text manipulation, and color conversion.
17 toolsFree Tools for Every Calculation
Whether you need to convert a unit, calculate loan payments, check your BMI, or solve a geometry problem, our collection of 98 free online tools has you covered. Every tool works instantly in your browser — no download, no account, and no personal data collected.
Why Use These Calculators?
- Instant results — calculations happen in real time as you type, no page reload needed.
- Mobile-friendly — every tool is fully responsive and works on phones and tablets.
- No tracking — sensitive tools like the Password Strength Checker and BMI Calculator never send data to a server.
- Free forever — all 98 tools are free with no paywalls or subscriptions.
Tool Categories
Tools are organised into eight categories for easy browsing: Math & Arithmetic covers basic through scientific calculations; Unit Converters handles every measurement system from temperature to data storage; Finance & Money includes interest, loan, and investment calculators; Health & Fitness covers BMI, calories, and pregnancy tracking; Cooking & Automotive helps in the kitchen and on the road; Electrical & Engineering supports circuit design and physics problems; Number Systems & Geometry covers binary maths and shape calculations; and Date, Text & Color handles utility tasks like date arithmetic, string tools, and colour conversion.