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Unit Converter
Conversion Results
How to Use the Unit Converter
Length Conversion
Convert between metric lengths (kilometers, meters, centimeters, millimeters) and imperial lengths (miles, yards, feet, inches). Perfect for construction, engineering, and everyday measurements.
Weight Conversion
Convert between metric weights (kilograms, grams, milligrams, metric tons) and imperial weights (pounds, ounces). Essential for cooking, fitness, and shipping.
Volume Conversion
Convert between liters, milliliters, cubic meters, gallons, fluid ounces, and pints. Useful for cooking, fuel consumption, and container sizing.
Speed Conversion
Convert between kilometers per hour, meters per second, miles per hour, knots, and feet per second. Perfect for driving, aviation, and sports.
View Results
- Original Value: The amount you entered
- From Unit: The unit you're converting from
- Converted Value: The result after conversion
- To Unit: The target unit
- Conversion Factor: How much larger or smaller the target unit is
- Category: The type of measurement (Length, Weight, Volume, Speed)
Common Uses for Unit Conversion
International Travel
Different countries use different measurement systems. Convert distances, weights, and speeds when traveling internationally.
Scientific & Engineering
Scientists and engineers frequently need to convert between metric and imperial units for calculations and research.
Cooking & Baking
Recipes from different countries use different measurement units. Convert cup measurements to grams or milliliters.
Fitness & Health
Track fitness metrics across different measurement systems. Convert between pounds and kilograms for weight tracking.
Automotive & Aviation
Convert speed measurements like mph to km/h or knots. Essential for driving and flight planning.
Construction & Contracting
Construction materials and measurements are often specified in different units. Convert accurately to avoid errors.
Education & Learning
Students use unit converters to understand different measurement systems and solve physics and chemistry problems.
Features
- Four Categories: Length, Weight, Volume, and Speed conversions
- Multiple Units: 30+ different units across all categories
- Metric & Imperial: Conversion between metric and imperial systems
- Decimal Support: Handle fractional and decimal values
- Instant Results: Real-time conversion as you enter values
- Conversion Factor Display: See how units relate to each other
- Reference Charts: Quick conversion tables for common units
- Mobile Friendly: Perfect for on-the-go conversions
- No Sign-up Required: Instant access, completely free
- Accurate Conversions: Based on standard conversion factors
Quick Reference Conversion Charts
Length Conversion (Common Values)
| Meter (m) | Kilometer (km) | Foot (ft) | Mile (mi) |
|---|---|---|---|
| 1 | 0.001 | 3.281 | 0.000621 |
| 100 | 0.1 | 328.1 | 0.0621 |
| 1000 | 1 | 3281 | 0.621 |
| 1609 | 1.609 | 5280 | 1 |
Weight Conversion (Common Values)
| Kilogram (kg) | Gram (g) | Pound (lb) | Ounce (oz) |
|---|---|---|---|
| 1 | 1000 | 2.205 | 35.27 |
| 0.1 | 100 | 0.2205 | 3.527 |
| 0.453 | 453 | 1 | 16 |
| 0.0283 | 28.35 | 0.0625 | 1 |
Volume Conversion (Common Values)
| Liter (L) | Milliliter (ml) | US Gallon (gal) | Fluid Ounce (fl oz) |
|---|---|---|---|
| 1 | 1000 | 0.264 | 33.814 |
| 0.1 | 100 | 0.0264 | 3.381 |
| 3.785 | 3785 | 1 | 128 |
| 0.0296 | 29.574 | 0.0078 | 1 |
Speed Conversion (Common Values)
| km/h | m/s | mph | Knots |
|---|---|---|---|
| 1 | 0.2778 | 0.6214 | 0.5396 |
| 10 | 2.778 | 6.214 | 5.396 |
| 100 | 27.78 | 62.14 | 53.96 |
| 60 | 16.67 | 37.28 | 32.38 |
Understanding Units of Measurement
Metric System (SI Units)
The metric system is the international standard for measurements. It's based on powers of 10, making conversions straightforward.
Weight: Kilogram (kg) - base unit. Gram (g), Milligram (mg)
Volume: Liter (L) - based on cubic decimeter. Milliliter (ml)
Imperial System
Used primarily in the United States, the imperial system has less consistent conversion factors (e.g., 12 inches = 1 foot, 3 feet = 1 yard).
Weight: Ounce, Pound, Ton
Volume: Fluid Ounce, Cup, Pint, Quart, Gallon
Speed Units
Speed is measured as distance per unit time. Different professions prefer different units for convenience.
mph: Miles per hour - used in the US and UK
m/s: Meters per second - used in science
Knots: Nautical miles per hour - used in aviation and maritime
Conversion Tips & Tricks
Remember Key Conversions
Length: 1 inch = 2.54 cm, 1 mile = 1.6 km, 1 foot = 0.3 meters
Weight: 1 pound = 0.45 kg, 1 kg = 2.2 pounds, 1 ounce = 28.35 grams
Volume: 1 liter = 0.26 gallons, 1 gallon = 3.785 liters, 1 cup = 240 ml
Speed: 60 mph ≈ 97 km/h, 100 km/h ≈ 62 mph
Use Estimation for Quick Checks
When converting, estimate the result mentally first. For example, kilometers are larger than miles, so 100 km should be roughly 60 miles (100 × 0.6).
Understand Scale Factors
Metric units scale by 10 (1 km = 1000 m), while imperial units don't (1 mile = 5,280 feet). Understanding this helps with mental math.
Double-Check Your Units
Always verify you're converting between compatible units. You can't convert weight to length, or speed to volume.
Know Common Approximations
For quick calculations: 1 km ≈ 0.6 miles, 1 kg ≈ 2 pounds, 1 liter ≈ 1 quart, 1 gallon ≈ 4 liters
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Frequently Asked Questions
What's the difference between the metric and imperial systems?
The metric system is decimal-based (units scale by 10) and is used internationally. The imperial system is used primarily in the US and has less regular conversion factors.
Why are there so many different units for the same thing?
Different units developed in different regions and industries. Some are better for specific applications (e.g., knots for maritime, mph for driving).
How accurate are the conversions?
The conversions are based on standard international conversion factors and are accurate to many decimal places. For most practical purposes, they're more than accurate enough.
Can I convert between incompatible units?
No, you can't convert weight to distance or volume to speed. Units must be in the same measurement category.
What's the conversion factor between pounds and kilograms?
1 pound = 0.453592 kilograms, or approximately 0.45 kg. Conversely, 1 kg = 2.20462 pounds or about 2.2 pounds.
How do I know which unit to use?
Different professions and countries have conventions. In the US, imperial is common. In most other countries and in science, metric is standard. Use what's appropriate for your context.