Conversion Calculators
Browse our comprehensive collection of conversion calculators for area, energy, fuel, height, length, pressure, speed, temperature, volume, weight, and more. Free online tools for students, professionals, and everyday use.
Square Feet to Square Meters
Convert square feet (ft²) to square meters (m²) with exact conversion factor.
areaSquare Meters to Square Feet
Convert square meters (m²) to square feet (ft²) with step-by-step formula.
areaAcres to Square Meters
Convert acres to square meters (m²) for land area measurements.
areaHectares to Acres
Convert hectares to acres for agricultural and land planning.
areaSquare Yards to Square Meters
Convert square yards (yd²) to square meters (m²) with precision.
areaSquare Miles to Square Kilometers
Convert square miles (mi²) to square kilometers (km²) for large areas.
areaSquare Inches to Square Centimeters
Convert square inches (in²) to square centimeters (cm²).
areaSquare Feet to Square Yards
Convert square feet (ft²) to square yards (yd²) quickly.
areaJoules to Calories
Convert joules (J) to calories (cal) for energy measurements.
energyKilowatt-hours to Joules
Convert kWh to joules (J) for electrical energy conversion.
energyBTU to Joules
Convert British Thermal Units (BTU) to joules (J).
energyCalories to Kilojoules
Convert calories (cal) to kilojoules (kJ) for nutrition.
energyElectronvolts to Joules
Convert electronvolts (eV) to joules (J) for atomic energy.
energyMegawatt-hours to Kilowatt-hours
Convert MWh to kWh for large energy quantities.
energyTherms to BTU
Convert therms to BTU for natural gas energy.
energyFoot-pounds to Joules
Convert foot-pounds (ft·lb) to joules (J) for mechanical work.
energyMiles per Gallon (MPG) to L/100km
Convert fuel economy from MPG to liters per 100 kilometers.
fuelL/100km to MPG
Convert fuel economy from L/100km to miles per gallon.
fuelFuel Cost Calculator
Calculate trip fuel cost based on distance, fuel efficiency, and price.
fuelGallons to Liters
Convert US gallons to liters for fuel volume.
fuelLiters to Gallons
Convert liters to US gallons.
fuelFuel Efficiency Comparison
Compare fuel efficiency of different vehicles.
fuelCarbon Footprint from Fuel
Estimate CO₂ emissions from fuel consumption.
fuelMiles per Tank Calculator
Calculate how far you can drive on a full tank.
fuelFeet & Inches to Centimeters
Convert height from feet and inches to centimeters.
heightCentimeters to Feet & Inches
Convert height from centimeters to feet and inches.
heightMeters to Feet
Convert meters to feet for height or distance.
heightFeet to Meters
Convert feet to meters.
heightInches to Centimeters
Convert inches to centimeters for small lengths.
heightCentimeters to Inches
Convert centimeters to inches.
heightYards to Meters
Convert yards to meters for sports and construction.
heightMiles to Kilometers
Convert miles to kilometers for distance measurement.
heightMeters to Kilometers
Convert meters to kilometers.
lengthKilometers to Meters
Convert kilometers to meters.
lengthMiles to Yards
Convert miles to yards.
lengthFeet to Yards
Convert feet to yards.
lengthNautical Miles to Kilometers
Convert nautical miles to kilometers for navigation.
lengthMicrometers to Millimeters
Convert micrometers (µm) to millimeters (mm).
lengthNanometers to Micrometers
Convert nanometers to micrometers for science.
lengthAngstroms to Nanometers
Convert angstroms (Å) to nanometers (nm).
lengthPSI to kPa
Convert pounds per square inch (PSI) to kilopascals (kPa).
pressurekPa to PSI
Convert kilopascals (kPa) to PSI.
pressureAtmospheres to kPa
Convert standard atmospheres (atm) to kilopascals.
pressureBar to PSI
Convert bar to pounds per square inch (PSI).
pressuremmHg to kPa
Convert millimeters of mercury (mmHg) to kilopascals.
pressureinHg to kPa
Convert inches of mercury (inHg) to kilopascals.
pressurePascal to PSI
Convert pascals (Pa) to pounds per square inch.
pressureTorr to Atm
Convert torr to standard atmospheres (atm).
pressureMiles per Hour to Kilometers per Hour
Convert mph to km/h for speed limits and travel.
speedKilometers per Hour to Miles per Hour
Convert km/h to mph.
speedMeters per Second to Feet per Second
Convert m/s to ft/s for physics and engineering.
speedKnots to Miles per Hour
Convert knots (nautical miles per hour) to mph.
speedMach to Kilometers per Hour
Convert Mach number to km/h at standard conditions.
speedSpeed of Light to m/s
Convert speed of light (c) to meters per second.
speedFeet per Minute to Meters per Second
Convert ft/min to m/s for conveyor speeds.
speedKilometers per Second to Miles per Second
Convert km/s to mi/s for space velocities.
speedCelsius to Fahrenheit
Convert Celsius (°C) to Fahrenheit (°F) with formula.
temperatureFahrenheit to Celsius
Convert Fahrenheit (°F) to Celsius (°C).
temperatureCelsius to Kelvin
Convert Celsius (°C) to Kelvin (K).
temperatureKelvin to Celsius
Convert Kelvin (K) to Celsius (°C).
temperatureFahrenheit to Kelvin
Convert Fahrenheit (°F) to Kelvin (K).
temperatureKelvin to Fahrenheit
Convert Kelvin (K) to Fahrenheit (°F).
temperatureRankine to Kelvin
Convert Rankine (°R) to Kelvin (K).
temperatureDelisle to Celsius
Convert Delisle to Celsius for historical scales.
temperatureLiters to Gallons (US)
Convert liters to US gallons.
volumeGallons (US) to Liters
Convert US gallons to liters.
volumeMilliliters to Fluid Ounces
Convert milliliters (mL) to fluid ounces (fl oz).
volumeCubic Meters to Cubic Feet
Convert m³ to ft³ for construction and shipping.
volumeCubic Inches to Cubic Centimeters
Convert in³ to cm³ for engine displacement.
volumeBarrels to Gallons
Convert oil barrels to US gallons.
volumePints to Liters
Convert US pints to liters.
volumeQuarts to Liters
Convert US quarts to liters.
volumeKilograms to Pounds
Convert kg to lbs for body weight and cargo.
weightPounds to Kilograms
Convert lbs to kg.
weightOunces to Grams
Convert ounces (oz) to grams (g).
weightGrams to Ounces
Convert grams to ounces.
weightStones to Kilograms
Convert stone (st) to kilograms.
weightPounds to Grams
Convert pounds to grams.
weightMetric Tons to US Tons
Convert metric tons to short tons (US).
weightCarats to Grams
Convert carats (ct) to grams for gemstones.
weightWhat Are Conversion Calculators?
Our Conversion Calculators collection provides fast, accurate unit conversions for everyday and scientific use. Whether you're converting area for real estate, fuel efficiency for travel, temperature for cooking, or weight for shipping, our tools make it easy to switch between units with confidence.
From square feet to square meters and Celsius to Fahrenheit to kilometers to miles and kilograms to pounds, we cover the most common conversion needs across multiple disciplines.
How to Use This Directory
- Search: Type a keyword into the search bar to find specific converters by name or description.
- Filter by Category: Use the dropdown to narrow down to a specific conversion type — each option shows the number of calculators available.
- Click to Use: Each card links directly to the conversion tool. Click on any card to start converting instantly.
- Explore Category Pages: Use the "Explore All Conversion Calculator Categories" section to access dedicated pages with even more tools.
Why Use Our Conversion Calculators?
- Comprehensive Coverage: Covers area, energy, fuel, height, length, pressure, speed, temperature, volume, weight, and more.
- Accurate & Reliable: Built with exact conversion factors and regularly reviewed.
- Free & Accessible: No registration, no fees — use any tool instantly on any device.
- Educational: Many tools show the conversion formula, helping you understand the math behind the numbers.
- Continuously Updated: We add new converters and improve existing ones based on user feedback.
❓ Conversion Calculators FAQ
What types of conversions can I perform?
We offer tools for area (e.g., ft² to m²), energy (J to cal), fuel (MPG to L/100km), height (ft/in to cm), length (m to km), pressure (PSI to kPa), speed (mph to km/h), temperature (°C to °F), volume (L to gal), and weight (kg to lbs).
How do I convert feet to meters?
Use our Feet to Meters converter under the Length category. Enter the number of feet and the tool will show the equivalent meters.
How do I convert Celsius to Fahrenheit?
Use our Celsius to Fahrenheit converter. It uses the formula °F = °C × 9/5 + 32 and displays the result instantly.
What is the difference between US gallons and UK gallons?
Our calculators use US gallons for most tools, but we also provide separate converters for UK gallons where applicable.
Can I convert between different pressure units?
Yes, we have converters for PSI, kPa, atm, bar, mmHg, torr, and more.
How accurate are the conversion factors?
We use internationally recognized conversion factors to ensure accuracy up to many decimal places.
Do you have a volume converter for cooking?
Yes, we have converters for milliliters, fluid ounces, cups, pints, quarts, and gallons.
Are these calculators suitable for professional use?
Yes, they are accurate and reliable for engineering, construction, logistics, and scientific applications.
How often are new conversion tools added?
We regularly add new converters based on user requests. If you need a specific conversion, please let us know.
Do I need to create an account to use these tools?
No, all converters are completely free to use without registration.