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Free Online Unit Converter – Length, Weight, Temperature & More

Convert between metric, imperial, and scientific units in one place — no app to install, no sign-up, no ads interrupting your work. Just pick a category, type a number, and get an instant, accurate result with the exact formula shown alongside it.

Whether you’re cooking from a recipe in cups instead of milliliters, checking a fever in Fahrenheit instead of Celsius, converting a car’s fuel economy from mpg to km/L, or double-checking a shipping weight in kilograms versus pounds — this tool covers it.

Try It Now

Pick a category below, then type into either box — it converts as you type.

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Formula

How to Use This Converter

1
Choose a category
Select what you’re converting — Length, Mass, Temperature, Volume, and 10 more categories are available in the dropdown.
2
Pick your units
Set the “from” and “to” units on either side. Every category lists its most common units, from metric to imperial to scientific.
3
Type a number
Enter a value in either box — the other one updates instantly, and the formula used is shown right below.

Quick Conversion Reference

A few commonly searched conversions from each category, for a fast lookup without opening the tool above.

Length

  • 1 km = 0.6214 miles
  • 1 mile = 1.6093 km
  • 1 inch = 2.54 cm
  • 1 foot = 0.3048 m

Mass

  • 1 kg = 2.2046 lb
  • 1 lb = 0.4536 kg
  • 1 oz = 28.35 g
  • 1 stone = 6.35 kg

Temperature

  • 0°C = 32°F = 273.15 K
  • 37°C = 98.6°F (body temp)
  • 100°C = 212°F (boiling)
  • -40°C = -40°F

Area

  • 1 acre = 4046.86 m²
  • 1 hectare = 10,000 m²
  • 1 sq mile = 2.59 km²
  • 1 sq ft = 0.0929 m²

Volume

  • 1 liter = 0.2642 US gal
  • 1 US gallon = 3.7854 L
  • 1 cup = 236.6 mL
  • 1 tbsp = 14.79 mL

Speed

  • 1 km/h = 0.6214 mph
  • 1 mph = 1.6093 km/h
  • 1 knot = 1.852 km/h
  • 1 m/s = 3.6 km/h

Time

  • 1 day = 86,400 seconds
  • 1 week = 604,800 seconds
  • 1 year (avg) = 365.24 days
  • 1 hour = 3,600 seconds

Digital Storage

  • 1 byte = 8 bits
  • 1 GB = 1000 MB
  • 1 GiB = 1024 MiB
  • 1 TB = 1000 GB

Data Transfer Rate

  • 1 Mbps = 0.125 MB/s
  • 1 MB/s = 8 Mbps
  • 1 Gbps = 1000 Mbps
  • 1 byte/s = 8 bit/s

Energy

  • 1 kcal = 4184 J
  • 1 kWh = 3.6 MJ
  • 1 BTU = 1055.06 J
  • 1 cal = 4.184 J

Frequency

  • 1 kHz = 1000 Hz
  • 1 MHz = 1,000,000 Hz
  • 1 GHz = 1000 MHz
  • 1 rpm ≈ 0.0167 Hz

Fuel Economy

  • 1 mpg (US) ≈ 0.4251 km/L
  • 10 L/100km ≈ 23.5 mpg (US)
  • 1 mpg (UK) ≈ 0.3540 km/L
  • 1 mi/L = 1.6093 km/L

Plane Angle

  • 1 radian ≈ 57.30°
  • 1 turn = 360°
  • 90° = 100 gradians
  • 1° = 60 arcminutes

Pressure

  • 1 atm = 101,325 Pa
  • 1 bar = 100,000 Pa
  • 1 psi ≈ 6894.76 Pa
  • 1 atm ≈ 14.7 psi

Frequently Asked Questions

How accurate are these conversions?
Every conversion factor used in this tool is based on internationally recognized standards (SI/metric definitions and standard imperial equivalents), and results are calculated in real time rather than looked up from a rounded chart — so you’re getting full precision, not an approximation.
Why does the formula show two steps for some conversions?
Internally, each category converts through one shared base unit (for example, everything in Length routes through meters). If neither your “from” nor “to” unit is that base unit, the tool shows both steps — source-to-base, then base-to-target — so you can follow the full working.
Can I convert in both directions?
Yes. You can type a value into either box — the tool detects which side you’re editing and recalculates the other one instantly, along with the matching formula.
Why is Liters/100km different from the other fuel economy units?
Most fuel economy units measure distance per volume (like km per liter), where a bigger number means better efficiency. L/100km measures the opposite — volume per distance — so a smaller number means better efficiency. The tool accounts for this automatically when converting.
Is this converter free to use?
Yes, it’s completely free with no sign-up, no limits, and no data sent anywhere — all calculations happen directly in your browser.

Conversion factors are based on standard SI (metric) definitions and widely used imperial/US customary equivalents. Month and year figures for Time use calendar averages (30.44 and 365.24 days respectively) since these units don’t have a fixed length.

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Aarav Choudhary

Welcome to Measuresly.com, your trusted destination for free online calculators and unit converters. Our mission is to make everyday calculations simple, fast, and accurate for everyone.

Whether you’re a student, professional, traveler, engineer, business owner, or simply need a quick conversion, our tools are designed to deliver reliable results in just a few clicks. From calculating your Body Mass Index (BMI) to converting length, weight, temperature, area, volume, speed, time, currency, and data storage units, we provide everything you need in one convenient place.

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