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Conversion Calculators

Convert between different units of measurement.

Length Converter

Length converter converts inches, feet, yards, meters, miles, and kilometers. Handles all metric-to-imperial and SI length unit pairs.

Distance Converter

Distance converter handles metric, imperial, nautical, and astronomical units. Converts light-years, nautical miles, and standard distances.

Weight/Mass Converter

Weight and mass converter handles pounds, ounces, kilograms, grams, and stones. Covers metric and imperial mass unit conversions accurately.

Temperature Converter

Temperature converter converts between Celsius, Fahrenheit, Kelvin, and Rankine. Uses exact formulas: °F=(°C×9/5)+32 and K=°C+273.15.

Konwerter kosmiczny

Konwersja między akrami, hektarami, metrami kwadratowymi i stopami kwadratowymi.

Volume Converter

Volume converter converts gallons, liters, cubic meters, cubic feet, and fluid ounces. Handles cooking and industrial volume unit pairs.

Speed Converter

Speed converter converts mph, km/h, m/s, knots, and feet per second. Useful for wind, vehicle, and oceanic navigation speed calculations.

Energy Converter

Energy converter converts joules, calories, BTUs, kilowatt-hours, and eV. Covers physics, nutrition, and electrical energy unit conversions.

Power Converter

Power converter converts watts, kilowatts, horsepower, and BTU/hour values. Covers both mechanical and electrical power unit conversions.

Pressure Converter

Pressure converter converts psi, bar, pascal, atm, torr, and mmHg. Handles tire, barometric, and industrial pressure unit conversions.

Data Storage Converter

Data storage converter converts bytes, KB, MB, GB, and TB units. Handles both binary (1024-based) and decimal (1000-based) SI standards.

Time Converter

Time converter converts seconds, minutes, hours, days, weeks, months, and years. Covers decimal time and all calendar and SI time units.

Angle Converter

Angle converter converts degrees, radians, gradians, arcminutes, and arcseconds. Covers trigonometry, navigation, and surveying angle units.

Currency Converter

Currency converter converts between world currencies using live exchange rates. Supports all major ISO 4217 currencies with real-time data.

Fuel Efficiency Converter

Fuel efficiency converter converts MPG, L/100km, and km/L values. Handles US and UK gallon differences for accurate fuel economy results.

Digital Storage Converter

Digital storage converter converts bits, bytes, kibibytes, mebibytes, and gibibytes. Distinguishes binary IEC and decimal SI prefixes.

Fraction to Decimal

Fraction-to-decimal converter turns fractions and mixed numbers into decimals. Flags repeating digits and shows step-by-step long division.

Decimal to Fraction

Decimal-to-fraction converter turns terminating and repeating decimals to fractions. Reduces to lowest terms via GCD with full steps shown.

Concentration Converter

Concentration converter converts ppm, ppb, percent, molarity, and mg/L values. Handles weight-per-volume and weight-per-weight expressions.

Roman Numerals Converter

Roman numeral converter maps Roman (I,V,X,L,C,D,M) to Arabic and vice versa. Handles 1–3999 with additive and subtractive notation rules.

Number Base Converter

Number base converter converts decimal, binary, octal, and hexadecimal numbers. Supports bases 2–36 with step-by-step conversion workings.

Cooking Converter

Cooking converter converts cups, tablespoons, teaspoons, and milliliters. Handles US and metric recipe measurements and ingredient density.

Hexadecimal Converter

Hexadecimal converter converts between hex, decimal, binary, and octal systems. Handles signed integers and shows results in all four bases.

How Conversion Calculators Work

Our conversion calculators use precise mathematical formulas and conversion factors to provide accurate transformations between different measurement systems. Each calculator is designed to handle specific conversion types with high accuracy.

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Internationally recognised factors

Based on SI, NIST, and official measurement standards

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Runs in your browser

Instant results with no data sent to any server

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Free & instant

No account, no signup, no cost ever

Results are estimates verify for critical use

Most unit conversions are exact, but some particularly temperature approximations, nutritional equivalents, or context-dependent values involve rounding or assumptions. Results should be treated as a guide. For engineering specifications, regulatory compliance, scientific research, or trade transactions, always verify conversions against an authoritative reference or consult a qualified professional.