All Converter Categories
Discover our 16 carefully organized categories with precise converters for every need.
Lengths & Distances
Convert length and distance units quickly and accurately. Our calculators cover all common units: meters, kilometers, centimeters, millimeters, miles, yards, feet, inches, nautical miles, light-years and more. Whether you need metric to imperial, or any other combination, our free online length converters deliver instant, precise results. Ideal for students, engineers, travellers and anyone working with international measurements.
Weights & Masses
Convert weight and mass units with ease using our comprehensive calculators. Supported units include kilograms, grams, milligrams, pounds, ounces, stone, tons (metric, short and long), carats and more. Our converters are used by cooks, scientists, logistics professionals and everyday users who need fast and accurate weight conversions. All tools are free to use, require no registration and work on any device.
Time & Date
Convert time units and calculate date differences with our free online tools. Supported units include seconds, minutes, hours, days, weeks, months and years. Also available: working hours calculator, age calculator, countdown timer, and date difference tool. Whether you're scheduling projects, calculating overtime or simply converting hours to days, our time converters provide instant and accurate results for every need.
Digital Units
Convert digital storage units instantly with our free online calculators. Supported units include bits, bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes and beyond. Ideal for IT professionals, students and anyone comparing storage sizes, internet speeds or data transfer rates. Our converters use precise binary (IEC) and decimal (SI) standards, so you always get the correct result whether you need KiB or KB.
Graphics, Photo & Design
Professional calculators and converters for graphic designers, photographers and digital artists. Convert between RGB, CMYK, HEX, HSL and Pantone colours. Calculate DPI/PPI, print sizes, image resolution, aspect ratios, file sizes and more. Also includes golden ratio calculator, font size converter and screen resolution tools. All tools are free, browser-based and require no software installation.
Electricity
Professional electrical calculators for engineers, electricians and students. Our tools cover Ohm's law, power calculations, cable cross-section sizing, voltage drop, resistance, capacitance, inductance and more. All calculators comply with DIN VDE standards and provide instant, accurate results. Perfect for planning electrical installations, verifying designs or solving technical problems in the field.
Finance & Taxes
Free financial and tax calculators for personal and business use. Our tools include gross-to-net salary calculator, VAT calculator, loan and interest calculator, investment return calculator, depreciation calculator and more. All calculators are kept up to date with current tax rates and legal requirements. Ideal for employees, freelancers, entrepreneurs and anyone managing their finances in Germany and beyond.
Ultra-Pure Gas Systems
Specialised calculators for ultra-pure gas systems used in semiconductor manufacturing, pharmaceuticals, laboratories and high-tech industry. Calculate gas flow rates, pressure loss, pipe dimensioning and system parameters with precision. Our tools are designed for engineers and technicians working with nitrogen, argon, helium, hydrogen and other process gases. All calculations follow industry standards for ultra-high purity (UHP) gas systems.
Mathematics & Calculation
Mathematical calculators and tools for everyday and academic use. Our collection includes percentage calculator, rule of three, average and mean, fraction calculator, prime number checker, greatest common divisor, least common multiple, Pythagorean theorem, and many more. Whether you're a student, teacher or professional, our math tools provide instant and accurate results for all common mathematical operations.
Physics & Science
Physics and science calculators with formulas for students, teachers and engineers. Our tools cover mechanics, thermodynamics, electrostatics, optics and more. Calculate velocity, acceleration, force, work, energy, pressure, density, electric field strength and many other physical quantities. Each calculator includes the underlying formula for learning and verification. All tools are free and available without registration.
Car & Mobility
Car and mobility calculators for drivers, commuters and fleet managers. Calculate fuel consumption, fuel costs per 100 km, travel expenses, toll costs, CO₂ emissions and trip duration. Also includes tyre size calculator, tachograph calculator, electric vehicle range estimator and more. All tools are free, fast and precise — perfect for planning trips or monitoring vehicle running costs.
Health & Fitness
Health and fitness calculators for a healthier lifestyle. Our tools include BMI calculator, calorie calculator, basal metabolic rate (BMR), ideal weight calculator, body fat percentage, water intake, walking steps to calories, and more. Whether you're planning a diet, tracking fitness goals or consulting health guidelines, our free online tools provide reliable results based on established medical formulas.
Construction & Crafts
Practical building and crafts calculators for DIY enthusiasts, tradespeople and construction professionals. Calculate material quantities for tiles, wallpaper, paint, concrete, bricks, wood flooring and more. Our tools help you plan purchases, reduce waste and stay within budget. Also includes roofing, insulation and room area calculators. All tools are free and easy to use on any device.
Kitchen & Cooking
Kitchen and cooking converters for home cooks, bakers and professional chefs. Convert cups to millilitres, tablespoons to grams, ounces to grams and many more cooking measurements. Adjust recipe portions for any number of servings, convert baking temperatures between Celsius, Fahrenheit and gas marks, and find substitutions for common ingredients. All tools are free and work perfectly on smartphones and tablets.
Electricity & Energy
Electricity and energy calculators for households, businesses and technical professionals. Calculate electricity costs, annual consumption, power savings from LED upgrades, solar yield estimates and more. Also includes Ohm's law calculator, cable length calculator, power factor calculator and other electrical engineering tools. Our free calculators help you understand and reduce your energy costs.
Simple Converters
Simple, fast unit converters for everyday use. This collection gathers the most frequently needed converters in one place: lengths, weights, temperatures, areas, volumes, speeds and more. No technical knowledge required — just enter your value and get instant results. Perfect for quick conversions at home, school or work. All converters are free, ad-light and mobile-friendly.
Find quickly
Use our categories to quickly find the right converter. Each category is carefully organized.
Precise results
All converters are mathematically validated and provide precise results for professional applications.
Available everywhere
Our converters work on all devices - desktop, tablet and smartphone. Free and without registration.
