Unit Converter
Convert length, weight, and temperature values with standard conversion factors. Calculations run in your browser, and the full conversion table updates as you type.
Enter a value to show the full conversion table.
Temperature values are converted through Celsius before the target unit is calculated. Length and weight use standard linear conversion factors.
Usage Tips
Compare different units instantly as you type
Use it when converting inches and pounds from overseas products into centimeters and kilograms, or when checking units with different formulas such as Celsius and Fahrenheit. Choose the conversion type and base unit, then enter a value to quickly compare common length, weight, and temperature units on one screen.
What is Unit Converter?
The Unit Converter is a precise utility designed for quick and accurate conversion between various measurement standards used in daily life, academic research, and engineering. It supports real-time conversions for length and weight across the Metric and Imperial systems, as well as multiple temperature scales. The tool automatically displays a comprehensive conversion table for all units within the selected category, eliminating calculation errors and streamlining unit comparisons.
How to Use
- 1Select the physical quantity category (Length, Weight, or Temperature) from the top tab.
- 2Enter the value you want to convert in the input field.
- 3Select the source unit (From) and the target unit (To) from their respective dropdown menus.
- 4The converted value will display instantly in real-time without needing to click any convert button.
- 5View the 'All converted units' table at the bottom to compare the input value against all other units in the same category simultaneously.
- 6Click the 'Copy result' button to save the conversion formula (e.g., 1 inch = 2.54 cm) to your clipboard for easy sharing and pasting.
Confirm the measurement category before converting
Last reviewed: July 11, 2026Unit conversion basis
converted value = input × target-unit factor ÷ source-unit factor; temperatures also use an offset
Length and mass values pass through a common base unit, while temperature scales need an offset because their zero points differ.
Converting 100°C and one inch
- • Temperature 100°C
- • Length 1 inch
- • Compare the full conversion table
- 1. Fahrenheit = 100 × 9 ÷ 5 + 32 = 212°F
- 2. Kelvin = 100 + 273.15 = 373.15K
- 3. 1 inch = 2.54cm
100°C becomes 212°F and 373.15K; one inch becomes 2.54cm.
How to read the result
- Length and mass use scale factors, but temperature also needs a zero-point offset.
- The all-units table helps compare one input across every unit in a category.
Conditions that change the result
- Repeating decimals and floating-point display can change the final visible digit after rounding.
- Some names hide regional definitions, such as US and Imperial gallons, so confirm the intended standard.
Common input mistakes
- Multiplying Celsius by 1.8 without adding 32 misses the Fahrenheit offset.
- Length, area, and volume are different dimensions and cannot use the same conversion factor.
Reference Knowledge
- ●Metric vs. Imperial System: The Metric System (SI) utilizes base-10 increments (cm, m, km), making it the global standard. The Imperial System remains common in regions like the US, using units like inches, feet, yards, and miles. Exact conversions are essential to minimize errors: 1 inch = 2.54 cm, 1 foot = 30.48 cm, and 1 yard = 91.44 cm.
- ●Weight & Mass Relations: The standard metric kilogram (kg) represents 1,000 grams (g). In the Imperial system, 1 pound (lb) is defined as exactly 0.453592 kg (or 453.592 g), while 1 ounce (oz) is approximately 28.3495 grams. These units are critical when calculating international shipments or consumer product specifications.
- ●Temperature Scales and Zero Offsets: Beyond Celsius (°C) and Fahrenheit (°F), scientific history has yielded scales like Kelvin (K), Réaumur (°Ré), Rankine (°Ra), Newton (°N), Delisle (°De), and Rømer (°Rø). Since different scales use different starting points and step sizes, conversions involve offsets (e.g., Celsius + 273.15 for Kelvin) as well as fractional scaling factors.
FAQ
Q.Why do some conversions display minor rounding differences?
Minor discrepancies can occur due to floating-point representation in computer hardware and programming languages (IEEE 754 standard) or when rounding repeating decimals. This is minor for standard usage, but precise applications should account for maximum significant figures.
Q.What are historical temperature scales like Newton (°N) or Delisle (°De)?
These are historical scales created in the 18th century. For instance, Isaac Newton defined his scale with 0°N as the freezing point of water and 33°N as the boiling point. Joseph-Nicolas Delisle created a reversed scale where 0°De is the boiling point of water and 150°De is the freezing point. The converter includes them for historical and academic reference.
Q.How does the 'All converted units' table work?
Instead of converting only one unit at a time, this table dynamically calculates and lists the equivalent value of your input across all units in the active category (such as cm, m, km, inch, ft, and yard for Length) at once.
Q.Is there a point where Celsius and Fahrenheit scales are equal?
Yes. Celsius and Fahrenheit scales cross and show the exact same numeric value at negative 40 degrees (-40°C = -40°F).
