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Unit Converter + Calculator Math

  • 2 days ago
  • 6 min read



What You'll Learn

  • Instant conversion charts for the most common units

  • Formulas for converting measurements manually

  • Length, weight, temperature, volume, pressure, and data conversions

  • Everyday examples for students, professionals, travelers, and home users

  • Frequently asked questions with quick answers

What Is a Unit Converter?

A unit converter is a tool that changes one unit of measurement into another while representing the exact same quantity.Unit Converter

For example:

  • 100 centimeters = 1 meter

  • 1 kilogram = 2.20462 pounds

  • 10 kilometers = 6.2137 miles

The measurement never changes—only the unit used to describe it.

Most countries use the metric system, while the United States primarily uses the imperial and US customary systems, making online converters essential for work, education, healthcare, travel, and shopping.

Conversion

Formula

Example

cm → inches

÷ 2.54

170 cm = 66.93 in

inches → cm

× 2.54

12 in = 30.48 cm

meters → feet

× 3.28084

2 m = 6.56 ft

feet → meters

× 0.3048

6 ft = 1.83 m

km → miles

× 0.621371

5 km = 3.11 mi

miles → km

× 1.60934

10 mi = 16.09 km

mm → inches

÷ 25.4

12 mm = 0.47 in

Metric

Imperial

1 cm

0.3937 in

10 cm

3.94 in

50 cm

19.69 in

100 cm

39.37 in

150 cm

59.06 in

170 cm

66.93 in

180 cm

70.87 in

200 cm

78.74 in

Quick Tip: To estimate centimeters to inches mentally, divide by 2.5 for a close approximation.

Conversion

Formula

Example

kg → lbs

× 2.20462

70 kg = 154.32 lbs

lbs → kg

× 0.453592

150 lbs = 68.04 kg

grams → ounces

÷ 28.3495

500 g = 17.64 oz

ounces → grams

× 28.3495

8 oz = 226.8 g

stone → kg

× 6.35029

10 st = 63.5 kg

tons → pounds

× 2,000

2 tons = 4,000 lbs

Kilograms

Pounds

40 kg

88.18 lbs

50 kg

110.23 lbs

60 kg

132.28 lbs

70 kg

154.32 lbs

80 kg

176.37 lbs

90 kg

198.42 lbs

100 kg

220.46 lbs

This is one of the most searched conversions because of fitness, international travel, shipping, and healthcare.

Conversion

Formula

Example

Celsius → Fahrenheit

(°C × 9/5) + 32

25°C = 77°F

Fahrenheit → Celsius

(°F − 32) × 5/9

98.6°F = 37°C

Celsius → Kelvin

°C + 273.15

25°C = 298.15 K

Celsius

Fahrenheit

-10°C

14°F

0°C

32°F

10°C

50°F

20°C

68°F

25°C

77°F

30°C

86°F

37°C

98.6°F

100°C

212°F

Volume Conversion Chart

Conversion

Formula

Example

Cups → mL

× 236.588

1 cup = 236.6 mL

Tablespoons → mL

× 14.787

1 tbsp = 14.8 mL

Teaspoons → mL

× 4.929

1 tsp = 4.9 mL

Liters → Gallons (US)

× 0.264172

10 L = 2.64 gal

Gallons → Liters

× 3.78541

5 gal = 18.93 L

These conversions are especially useful for recipes, beverages, laboratory work, and home improvement projects.

Conversion

Formula

PSI → kPa

× 6.89476

PSI → Bar

÷ 14.5038

Bar → PSI

× 14.5038

Horsepower → Kilowatts

× 0.7457

MPG → L/100 km

235.215 ÷ MPG

Engineers, mechanics, and technicians frequently use these conversions when working with equipment built to different regional standards.

Conversion

Formula

GB → MB

× 1024

TB → GB

× 1024

MB → KB

× 1024

KB → Bytes

× 1024

These binary conversions are commonly used in computing and data storage.

Unit conversion is essential because different countries, industries, and professions use different measurement systems.

Examples include:

  • International shipping

  • Medical records

  • Engineering drawings

  • Construction projects

  • Cooking recipes

  • Scientific research

  • Online shopping

  • Vehicle specifications

Using the correct conversion helps avoid mistakes, improves communication, and ensures measurements remain accurate across systems.

Centimeters to Inches

Formula

Inches = Centimeters ÷ 2.54

Example:

170 ÷ 2.54 = 66.93 inches

Kilograms to Pounds

Formula

Pounds = Kilograms × 2.20462

Example:

70 × 2.20462 = 154.32 pounds

Celsius to Fahrenheit

Formula

°F = (°C × 9/5) + 32

Example:

25°C = 77°F

Kilometers to Miles

Formula

Miles = Kilometers × 0.621371

Example:

15 km = 9.32 miles

Who Uses a Unit Converter?

User

Common Conversions

Students

Metric ↔ Imperial

Engineers

PSI, kPa, mm, inches

Healthcare Professionals

kg, lbs, Celsius

Travelers

Miles, kilometers, Celsius

Home Cooks

Cups, mL, teaspoons

Construction Workers

Feet, meters, inches

Scientists

Kelvin, SI units

Online Shoppers

Clothing sizes and measurements


One centimeter equals 0.3937 inches.

Multiply kilograms by 2.20462.

Example:

75 kg × 2.20462 = 165.35 lbs.

Multiply by 9, divide by 5, then add 32.

One kilometer equals 0.621371 miles.

One US cup equals 236.588 milliliters.

Yes. You can convert measurements instantly without creating an account or downloading software.

Yes. The formulas use internationally recognized conversion factors suitable for everyday, academic, engineering, and general professional use. For applications where precision is critical—such as medication dosing, laboratory analysis, or legal measurements—always verify values using approved references or industry-specific tools.

Quick Reference Cheat Sheet

Convert

Formula

cm → inches

÷ 2.54

inches → cm

× 2.54

kg → lbs

× 2.20462

lbs → kg

× 0.453592

°C → °F

(×9/5) + 32

°F → °C

(−32) ×5/9

km → miles

×0.621371

miles → km

×1.60934

cups → mL

×236.588

PSI → kPa

×6.89476

Length FAQs

How many inches is 1 cm?

1 centimeter equals 0.3937 inches. To convert centimeters to inches, divide the number of centimeters by 2.54.

Formula:

Inches = Centimeters ÷ 2.54

How do I convert feet to meters?

Multiply the number of feet by 0.3048.

Formula:

Meters = Feet × 0.3048

Example:

6 feet × 0.3048 = 1.8288 meters

How many miles is 1 km?

1 kilometer equals approximately 0.6214 miles.

To convert kilometers to miles, multiply by 0.621371.

Weight FAQs

How do I convert kg to lbs?

Multiply kilograms by 2.20462.

Formula:

Pounds = Kilograms × 2.20462

Example:

70 kg = 154.32 lbs

How many pounds is 1 stone?

1 stone equals exactly 14 pounds.

Stone is commonly used in the United Kingdom and Ireland for measuring body weight.

How do I convert grams to ounces?

Divide grams by 28.35.

Formula:

Ounces = Grams ÷ 28.35

Example:

500 grams = 17.64 ounces

Temperature FAQs

How do I convert Celsius to Fahrenheit?

Multiply the Celsius temperature by 9/5, then add 32.

Formula:

°F = (°C × 9/5) + 32

Example:

25°C = 77°F

What is 37°C in Fahrenheit?

37°C equals 98.6°F, which is considered the average normal human body temperature.

How do I convert Fahrenheit to Celsius?

Subtract 32 from the Fahrenheit temperature, then multiply by 5/9.

Formula:

°C = (°F − 32) × 5/9

Example:

98.6°F = 37°C

Volume & Cooking FAQs

How many mL is 1 cup?

1 US cup equals approximately 236.6 milliliters (mL).

How many tablespoons is 1 cup?

1 US cup equals 16 tablespoons.

How do I convert liters to gallons?

Multiply liters by 0.264172 to convert to US gallons.

Formula:

US Gallons = Liters × 0.264172

Example:

10 liters = 2.64 US gallons

Professional Conversion FAQs

How do I convert PSI to kPa?

Multiply PSI by 6.895.

Formula:

kPa = PSI × 6.895

Example:

30 PSI = 206.85 kPa

How do I convert mg to mL for medication dosing?

Milligrams (mg) cannot be converted directly to milliliters (mL) without knowing the medication's concentration (mg per mL). Always check the medication label or confirm the concentration with a pharmacist or healthcare professional before calculating a dose.

How do I convert horsepower to kilowatts?

Multiply horsepower by 0.7457.

Formula:

Kilowatts = Horsepower × 0.7457

Example:

100 horsepower = 74.57 kilowatts

 
 
 

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