Unit Converter for
Length, Weight & More
Convert between length, weight, temperature, volume, speed, area, and currency. Includes US/UK system toggle for volume, combined formats like stone+pounds, and exact formulas for every conversion. Your data never leaves your browser.
US Customary uses cups, pints, quarts, and gallons based on US standards. A US gallon is 3.785 liters.
Enter your actual bank or exchange rate. The mid-market rate you see on Google is not what banks charge — they typically add 1% to 3% markup. Our tool uses your rate so you see the real numbers.
Conversion Result
Show Your Work
Select a category and enter a value to see the exact formula and conversion factor.
How it works
Pick a category
Choose from length, weight, temperature, volume, speed, area, or currency. For volume, select US Customary, UK Imperial, or Metric to avoid unit confusion.
Enter your value
Type the number you want to convert and select the source unit. Use the swap button to reverse the conversion direction instantly.
See the result
Get your converted value instantly, plus the exact formula, alternative formats like stone+pounds or feet+inches, and a shareable link you can copy.
Explore more free calculators
Also try our Tax Calculator, Mortgage Calculator, and Calculators Hub.
Frequently asked questions
What is the Best Answer Hub Unit Converter?
The Best Answer Hub Unit Converter is a free, privacy-first browser tool that converts between length, weight, temperature, volume, speed, area, and currency. It runs entirely in your browser with no signup, no ads, and no data collection. Every conversion shows the exact formula so you know the math is correct. The volume category includes a US/UK/Metric system toggle to prevent the common confusion between US and Imperial gallons, pints, and fluid ounces.
How many centimeters are in an inch?
There are exactly 2.54 centimeters in one inch. This is a fixed international standard defined in 1959. To convert inches to centimeters, multiply the number of inches by 2.54. For example, 6 inches equals 15.24 centimeters, and 12 inches equals 30.48 centimeters. Our converter pre-loads this factor and shows the exact math in the Show Your Work panel.
What is 72 degrees Fahrenheit in Celsius?
72 degrees Fahrenheit equals 22.22 degrees Celsius. The exact formula is °C = (°F − 32) × 5/9. So (72 − 32) × 5/9 = 40 × 5/9 = 22.22°C. This is considered comfortable room temperature in the United States. Our tool also displays the reverse formula and handles negative temperatures correctly, which matters for freezer settings and winter weather.
How many pounds in a kilogram?
One kilogram equals approximately 2.20462 pounds. To convert kilograms to pounds, multiply by 2.20462. For example, 75 kilograms is about 165.35 pounds. To convert pounds to kilograms, divide by 2.20462 or multiply by 0.453592. Our converter shows both the decimal result and the stone-and-pounds combined format, which is how body weight is commonly expressed in the United Kingdom and Ireland.
What's 75 kg in pounds and stones?
75 kilograms is approximately 165.35 pounds, or 11 stone 11.3 pounds. One stone equals exactly 14 pounds. To convert from kilograms, first multiply by 2.20462 to get pounds, then divide by 14. The whole number is the stone value, and the remainder is the pounds. Our converter automatically shows this combined format whenever you convert to stones, which is far more useful than the decimal equivalent of 11.81 stone.
How many tablespoons are in a cup?
In the US customary system, there are 16 US tablespoons in one US cup. In the metric system commonly used outside the United States, a cup is typically 250 milliliters, which equals approximately 16.67 metric tablespoons of 15 milliliters each. Our converter includes a US/UK/Metric system toggle for volume so you always know which standard you are using. A UK tablespoon is 20 milliliters, so there are only 12.5 UK tablespoons in a metric cup.
How many liters are in a gallon?
A US gallon contains exactly 3.78541 liters. An Imperial UK gallon contains approximately 4.54609 liters. The UK gallon is about 20% larger than the US gallon. This difference causes frequent confusion, especially for fuel economy calculations and recipe conversions. Our volume converter lets you switch between US Customary, UK Imperial, and Metric Only modes so you never accidentally use the wrong gallon.
How many teaspoons in a tablespoon US vs UK?
A US tablespoon contains exactly 3 US teaspoons of 4.93 milliliters each. A UK or Australian tablespoon contains 4 teaspoons of 5.92 milliliters each. This means a UK tablespoon is roughly 20% larger than a US tablespoon. If you follow a British recipe using US spoons, you will add too little ingredient. Our converter labels every unit clearly with its origin system so you can match the spoon set you actually own.
How many gigabytes are in a terabyte exactly?
In the decimal system used by storage manufacturers, one terabyte equals exactly 1,000 gigabytes. In the binary system used by Windows and most operating systems, one tebibyte equals 1,024 gibibytes. This 2.4% difference at the gigabyte level compounds to about 7% at the terabyte level, which is why a 1 TB drive shows as roughly 931 GB in Windows File Explorer. Our Data Storage Converter covers this in depth.
Why does my 1 TB hard drive only show 931 GB?
Your operating system measures storage in binary gibibytes where 1 GiB = 1,024 MiB, while manufacturers market drives in decimal gigabytes where 1 GB = 1,000 MB. A 1,000 GB drive divided by 1.024 three times equals approximately 931 gibibytes. Both numbers are correct — they just use different counting systems. The IEC recommends using GiB for binary and GB for decimal, but most software still labels binary units as GB.
How do I convert Mbps to MB/s?
Divide the megabits per second by 8 to get megabytes per second. For example, a 100 Mbps internet connection equals 12.5 MB/s download speed. This confusion happens because file sizes are measured in bytes while internet speeds are marketed in bits. Internet service providers use megabits because the number is eight times larger and sounds more impressive. Our speed converter handles this automatically.
Why do currency exchange rates change every second?
Currency rates fluctuate based on supply and demand in the global foreign exchange market, which operates 24 hours a day across London, New York, Tokyo, and Sydney. Factors include interest rate changes, inflation data, political events, and central bank policies. The rate you see on Google is the mid-market rate. Banks and payment services like PayPal and Western Union add their own markup of 1% to 5%, which is why the actual rate you get is always worse.
How much is 1 Bitcoin in dollars right now?
Bitcoin prices change continuously based on trading activity across exchanges like Coinbase, Binance, and Kraken. For a live price, check a crypto tracker. Our currency tool lets you enter any exchange rate to see conversions, which is useful because the rate your exchange actually gives you often differs from the headline price by 1% to 3% due to spread and fees. Always check the final checkout price before confirming a trade.
How many square feet in an acre?
One acre contains exactly 43,560 square feet. This is a US customary unit of land area. One acre is also approximately 4,047 square meters, 0.4047 hectares, or roughly 90% of a standard American football field without the end zones. Our area converter handles acres, hectares, square meters, and square miles — common units for real estate listings in the US, Europe, and Asia.
What's the formula to convert Celsius to Fahrenheit?
The formula is °F = (°C × 9/5) + 32. To convert Fahrenheit to Celsius, use °C = (°F − 32) × 5/9. For quick mental math, double the Celsius value and add 30 to get an approximate Fahrenheit value. This shortcut is accurate within a few degrees for everyday temperatures between 0°C and 30°C, which covers most weather and room temperature scenarios.
Real-world conversions
Most international airlines allow 23 kg checked bags. That is roughly 50.7 pounds. If you are flying within the US, the limit is often 50 pounds — so 23 kg is just over the typical domestic allowance.
The standard highway speed limit in France and Italy is 130 km/h, while Germany has unlimited sections. At 120 km/h, you are driving roughly 75 mph — comparable to typical US interstate speeds.
A 12-foot by 10-foot bedroom is 120 square feet, or about 11.15 square meters. This is a small-to-medium bedroom size in both the US and Europe.
A 42-inch chest measurement equals about 106.7 centimeters. Many international brands list sizes in centimeters, so this conversion helps when ordering from European or Asian retailers.
Scenarios use standard international conversion factors. Actual airline limits, speed laws, and sizing vary by carrier, jurisdiction, and brand. Always verify with official sources.