Free Online Unit Converter
Convert any unit of measurement instantly. Fast, accurate, and completely free.
Quick Answer
Unit conversion multiplies a value by the exact ratio between two units — no rounding, no guessing.
Example: 1 mile = 1.60934 km • 1 kg = 2.20462 lb • 0°C = 32°F
🔥 Popular Conversions
ml to cups
1 ml = 0.00423 cups (US)
MB to GB
1 GB = 1,000 MB (decimal)
Acres to Square Feet
1 acre = 43,560 sq ft
Nanometers to Meters
1 nm = 0.000000001 m
Knots to km/h
1 knot = 1.852 km/h
Quarts to Gallons
4 quarts = 1 gallon
Acres to Hectares
1 acre = 0.4047 hectares
Hertz to rad/s
1 Hz = 6.2832 rad/s
Miles/h to Knots
1 mph = 0.8689 knots
Choose a Category
About ConvertAll
ConvertAll is a free, fast, and accurate online unit conversion tool. We support thousands of unit conversions across multiple categories including length, weight, temperature, speed, volume, area, data storage, time, energy, and pressure.
Our converter is designed to be simple and intuitive. Just select your conversion, enter a value, and get instant results. Every conversion includes a reference table and detailed explanation of the formula used.
Why Use ConvertAll?
- Instant Results: Get your conversion in real-time as you type
- Accurate: We use internationally recognized conversion factors
- Comprehensive: Thousands of unit combinations across 10+ categories
- Free: No registration, no fees, no limits
- Mobile-Friendly: Works perfectly on any device
Common Conversion Quick Answers
How many ml in a cup?
1 US cup = 236.588 ml. 1 metric cup = 250 ml. 1 imperial cup = 284.131 ml.
How many MB in a GB?
1 GB = 1,000 MB (decimal/SI). In binary: 1 GiB = 1,024 MiB.
How many feet in a mile?
1 mile = 5,280 feet exactly. 1 mile = 1.60934 kilometers.
How many ounces in a pound?
1 pound = 16 ounces (avoirdupois). 1 troy pound = 12 troy ounces.
How many acres in a hectare?
1 hectare = 2.471 acres. 1 acre = 0.4047 hectares = 43,560 sq ft.
How to convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. Formula: °F = (°C × 9/5) + 32. Example: 100°C = 212°F.
Frequently Asked Questions
How do I convert units online?
Select a category (length, weight, temperature, etc.), choose your source and target units, enter a value, and get an instant result. ConvertAll uses internationally recognized conversion factors for accuracy.
How many ml in a cup?
One US customary cup equals 236.588 ml. One metric cup equals exactly 250 ml. One imperial (UK) cup equals 284.131 ml. Use our ml to cups converter for instant results.
How many MB in a GB?
1 gigabyte (GB) equals 1,000 megabytes (MB) in decimal (SI) units, or 1,024 megabytes in binary (IEC) units. Most operating systems and storage manufacturers use the decimal definition. Use our MB to GB converter for quick conversions.
How many quarts in a gallon?
There are exactly 4 US quarts in 1 US gallon. One US gallon equals 3.785 liters. For imperial (UK) measurements, there are also 4 imperial quarts in 1 imperial gallon (4.546 liters). Try our quarts to gallons converter.
How do I convert knots to km/h?
Multiply the speed in knots by 1.852 to get kilometers per hour. For example, 10 knots = 18.52 km/h. One knot is defined as one nautical mile per hour (1.852 km/h exactly). Use our knots to km/h converter.
How many acres in a hectare?
1 hectare equals approximately 2.471 acres. Conversely, 1 acre equals approximately 0.4047 hectares. A hectare is 10,000 square meters; an acre is 43,560 square feet. Try our acres to hectares converter.
Related Tools You Might Like
Finance Calculator
Need financial calculations? Try Finance Tools for loans, investments, and salary calculators.
Fuel Cost Calculator
Calculate fuel costs for your trips and compare vehicle efficiency.
Electricity Bill Calculator
Calculate your electricity costs and find ways to save on your energy bill.