Weight · Length · Temperature · Area · Volume
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Founder & CEO, Toolraxy
Faiq Ur Rahman is a web designer, digital product developer, and founder of Toolraxy, a growing platform of web-based calculators and utility tools. He specializes in building structured, user-friendly tools focused on health, finance, productivity, and everyday problem-solving.
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A unit converter is an all-in-one tool that translates measurements between different unit systems across multiple categories. The world uses two primary measurement systems – metric (kilograms, meters, liters) and imperial/US customary (pounds, feet, gallons) – plus specialized scales like temperature (Celsius, Fahrenheit, Kelvin).
This converter handles five essential measurement categories in one place. Switch between weight, length, temperature, area, and volume with a single click. Type any value, select your units, and get instant results.
The problem: Measurement confusion costs time, money, and sometimes safety. A recipe from an American blog uses cups and ounces, but your kitchen scale measures grams. A European furniture website lists dimensions in centimeters, but your room measurements are in feet. Weather forecasts use different temperature scales depending on your country.
Without a converter, you’re forced to:
Memorize conversion factors (2.54 cm per inch, 0.4536 kg per pound)
Do mental math with fractions and decimals
Switch between multiple specialized tools
Risk errors that matter
What this all-in-one converter solves:
Efficiency – Five converters in one interface
Accuracy – Exact conversion factors, not approximations
Convenience – Switch categories without leaving the page
Education – Learn relationships between units as you convert
Universal use – Works for cooking, travel, DIY, science, and more
Select your category – Click Weight, Length, Temp, Area, or Volume tab
Enter your value – Type the number you want to convert in the “From” field
Choose “From” unit – Select the unit of your input value
Choose “To” unit – Select the desired output unit
Read your result – The converted value appears instantly
Pro tips:
Use the Swap button to reverse the conversion direction
Click Copy to save the result to your clipboard
Use Reset to return to default conversions
Try the common conversions grid for quick access to popular conversions
All conversions use standardized, internationally recognized relationships:
Weight: All units convert through kilograms (kg)
1 kg = 2.20462 pounds (exact: 2.20462262185)
1 pound = 16 ounces = 453.592 grams
Length: All units convert through meters (m)
1 meter = 3.28084 feet = 39.3701 inches
1 inch = 2.54 centimeters (exact, by definition)
1 mile = 1.60934 kilometers
Temperature: Uses standard formulas
Celsius to Fahrenheit: Multiply by 9/5, add 32
Fahrenheit to Celsius: Subtract 32, multiply by 5/9
Kelvin adds 273.15 to Celsius (absolute scale)
Area: All units convert through square meters (m²)
1 m² = 10.7639 square feet
1 hectare = 2.47105 acres
1 acre = 43,560 square feet
Volume: All US volume units convert through liters (L)
1 liter = 33.814 US fluid ounces
1 US gallon = 3.78541 liters
1 cup = 8 fluid ounces = 236.588 milliliters
Scenario: You’re baking an American cookie recipe that calls for 2 cups of flour, but your kitchen scale measures in grams.
| Step | Action | Result |
|---|---|---|
| 1 | Click the Volume tab | Volume converter appears |
| 2 | Enter “2” in the From field | Value set |
| 3 | Select “Cup (US)” as From unit | Source unit set |
| 4 | Select “Milliliter (mL)” as To unit | Target selected |
| 5 | Read the result | 473.176 mL |
But you need grams, not milliliters! No problem – flour density is approximately 0.5 g/mL, so 473 mL ≈ 236.5 grams. Or you could use the Weight tab to convert cups to grams directly if you know the specific ingredient density.
Why this matters: Using 2 cups (approx 240g) instead of the recipe’s intended 250g could affect your cookies. This converter gets you close, then you can adjust based on your experience.
✓ Five categories in one – Weight, length, temperature, area, volume – most comprehensive free converter
✓ Real-time updates – Results appear as you type, no buttons needed
✓ Swap function – Instantly reverse any conversion
✓ Copy to clipboard – Save results with one click
✓ Common conversions grid – Quick access to popular conversions
✓ Clean interface – Easy to read, easy to use
✓ Mobile optimized – Works perfectly on phones and tablets
✓ Completely free – No registration, no limits, no hidden fees
✓ Educational – Learn unit relationships through hands-on use
| User Type | How They Benefit |
|---|---|
| Travelers | Convert luggage weights, distances, temperatures |
| Home cooks & bakers | Convert recipe measurements between systems |
| Students | Learn measurement relationships, check homework |
| DIY enthusiasts | Convert between metric and imperial plans |
| Fitness enthusiasts | Track weight in preferred units |
| Engineers & technicians | Quick reference conversions |
| E-commerce sellers | List products in multiple measurement systems |
| Healthcare workers | Convert patient weights, medication measurements |
| Scientists | Lab measurement conversions |
| International shoppers | Understand product dimensions and weights |
1 cup of flour weighs differently than 1 cup of sugar. Volume measures space, weight measures mass. Use the correct category for your ingredient.
This converter uses US gallons. UK/imperial gallons are larger (1 UK gal = 1.2 US gal). Check which system your recipe or product uses.
Celsius to Fahrenheit isn’t just multiplication – you must add or subtract 32. The formula is (°C × 9/5) + 32 = °F.
Square meters measure area (2D), meters measure length (1D). A 10 m² room is not 10 m × 10 m (that would be 100 m²).
0.5 kg is 500 g, not 50 g. Pay attention to decimal places when using results for precise applications.
| Category | Common Metric Units | Common Imperial/US Units |
|---|---|---|
| Weight | kg, g, mg | lb, oz |
| Length | m, cm, mm, km | in, ft, yd, mile |
| Temperature | °C, K | °F |
| Area | m², km², ha | ft², acre, in² |
| Volume | L, mL, m³ | gal, qt, pt, cup, fl oz |
The metric system (International System of Units – SI) is based on powers of 10. One meter = 100 centimeters = 1000 millimeters. One kilogram = 1000 grams. This decimal basis makes conversions simple – just move the decimal point. Used by 95% of the world’s population, it’s the standard for science, medicine, and most international commerce.
While similar, US customary units and imperial units have differences. Both use inches, feet, yards, and miles identically. But gallons differ: US gal = 3.785 L, UK gal = 4.546 L. Pints also differ: US pt = 16 fl oz, UK pt = 20 fl oz. This converter uses US units – verify which system you need.
Celsius (°C) is used worldwide for everyday temperatures. Fahrenheit (°F) is used primarily in the US. Kelvin (K) is the scientific standard, starting at absolute zero (-273.15°C). The formulas connecting them are linear but include offsets – making temperature conversion different from other unit types.
Length is one-dimensional (a line). Area is two-dimensional (a surface). Converting between them requires squaring: 1 m = 3.28 ft, but 1 m² = 10.76 ft² (3.28²). This is why you can’t directly compare length and area measurements.
US cooking measurements (cups, tablespoons, teaspoons) are standardized but differ from metric. 1 cup = 236.588 mL exactly. Recipes from different countries require conversion – this tool handles it instantly. Remember that weight and volume are different for most ingredients.
The metric system was developed during the French Revolution for scientific consistency. Imperial units evolved from Roman, Anglo-Saxon, and medieval measurements – the foot was originally based on an actual foot, the inch on thumb width. Understanding this history explains why we have multiple systems today.
Five categories: weight, length, temperature, area, and volume – covering the most common measurement needs for everyday life, cooking, travel, and education.
Yes. All conversions use internationally recognized standard factors. Weight and length conversions use exact definitions where available (e.g., 1 inch = 2.54 cm exactly).
Absolutely. That’s the primary purpose. Convert kg to lb, m to ft, °C to °F, m² to ft², and L to gal or fl oz.
This requires knowing the density of your ingredient. Use the volume converter to get milliliters, then multiply by density (g/mL). For water, 1 mL = 1 g. For flour, approximately 0.5 g/mL. For sugar, approximately 0.85 g/mL.
US gallons are smaller. 1 US gal = 3.785 L, while 1 UK gal = 4.546 L. This converter uses US gallons. Check your context before converting.
Yes. All temperature scales except Kelvin accept negative values. Kelvin below 0 is physically impossible (absolute zero).
No limits. Convert as many times as you need, completely free.
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