SimpleToolbox

Universal Unit Converter

Convert between metric and imperial units instantly. Length, weight, temperature, and volume — free, private, no account needed. Works instantly in your browser.

100% Local
Lightning Fast
Always Free
Universal Conversion

Multi-Unit Converter

The only converter you'll ever need. Fast, precise, and covers every dimension of daily life.

Converted Result
3.2808
Feet
Exact Decimal Multiplier Applied

Swap Direction

Scale Factor

"Scientific standard precision"

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What Is a Unit Converter?

A unit converter is a tool that converts a measurement from one unit to another — for example, inches to centimeters, kilograms to pounds, or Celsius to Fahrenheit. This converter covers four everyday categories: length, weight, temperature, and volume.

How to Use the Unit Converter

  1. Select a category. Choose the type of measurement: length, weight, temperature, or volume.
  2. Enter your value. Type the number you want to convert.
  3. Select your units. Choose your starting unit (for example, Celsius) and your target unit (for example, Fahrenheit).
  4. Read your result. The converted value appears instantly using exact conversion constants — no rounding errors.

Who Is This For?

  • Students doing homework who need to convert between metric and imperial units for physics, chemistry, or math problems.
  • Cooks converting recipe measurements from a foreign cookbook — grams to cups, Celsius to Fahrenheit, milliliters to fluid ounces.
  • Anyone comparing product specs listed in unfamiliar units — screen sizes in inches vs. centimeters, engine displacement in liters vs. cubic inches, or clothing sizes listed in different measurement systems.

Key Benefits

  • 100% private — all conversions run locally in your browser; nothing is sent to any server.
  • Completely free — no subscription, no ads based on your usage, no sign-up required.
  • No account required — open the page and start converting immediately.
  • Mathematically exact — uses official fundamental constants (the inch is defined as exactly 25.4 mm), so results are precise, not approximate.

Common Use Cases

A student in Canada needs to convert their weight from kilograms to pounds for a US sports registration form. A home cook finds a British recipe specifying 250ml of cream and needs to know how many cups that is. A traveler packing for a trip to Europe checks that 20°C means a comfortable 68°F — light jacket weather, not winter coat weather. An online shopper compares a product's 15-inch measurement to their space measured in centimeters.

Did You Know?

Almost every modern measurement system is defined in terms of the metric system. Even the "Imperial inch" is officially defined as exactly 25.4 millimeters. This converter uses these exact fundamental constants, so your conversions are mathematically perfect every time.

Frequently Asked Questions

What is a unit converter? ▼
A unit converter is a tool that converts a measurement from one unit to another — for example, inches to centimeters, kilograms to pounds, or Celsius to Fahrenheit. This converter covers four categories: length, weight, temperature, and volume.
Is this unit converter free? ▼
Yes, completely free. No account, no subscription, and no sign-up required. All conversions run locally in your browser — no data is sent to any server.
How do I convert Celsius to Fahrenheit? ▼
The formula is: °F = (°C × 9/5) + 32. For example, 0°C = 32°F (freezing), 100°C = 212°F (boiling), and 37°C = 98.6°F (normal body temperature). You can also use this converter to get the result instantly without doing the math yourself.
How many feet are in a meter? ▼
One meter equals 3.28084 feet, or approximately 3 feet and 3.37 inches. Conversely, one foot equals exactly 0.3048 meters. The inch is officially defined as 25.4 millimeters, so all imperial-to-metric conversions are mathematically exact, not approximations.
How many liters are in a gallon? ▼
It depends on which gallon: a US liquid gallon equals 3.785 liters, while a UK Imperial gallon equals 4.546 liters. The US gallon is about 17% smaller than the UK gallon. When a recipe or fuel economy figure references "gallons," check which country it came from — the difference is significant enough to matter in cooking and fuel calculations.
How do I convert kilograms to pounds? ▼
One kilogram equals 2.20462 pounds. To convert kg to lbs, multiply by 2.20462. To go the other direction, divide by 2.20462 (or multiply by 0.453592). For quick mental math, 1 kg ≈ 2.2 lbs is close enough for most everyday purposes.
Disclaimer

The tools and calculators provided on The Simple Toolbox are intended for educational and informational purposes only. They do not constitute financial, legal, tax, or professional advice. While we strive to keep calculations accurate, numbers are based on user inputs and standard assumptions that may not apply to your specific situation. Always consult with a certified professional (such as a CPA, financial advisor, or attorney) before making significant financial or business decisions.

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