Mass Converter
Free Mass Calculator for conversions & measurement. Enter values to get step-by-step solutions with formulas and graphs.
Reviewed for accuracy by Manoj Kumar, Mathematics Educator
Mass Converter
Calculator
Adjust values & calculateEnter your values below. Every result is computed in your browser — no data is sent to any server.
Formula: target_value = input_value * (input_to_kg / target_to_kg)
Worked example — 1 kg = 1000 g = 2.2046 lb = 35.2740 oz = 5000 ct
Formula
target_value = input_value * (input_to_kg / target_to_kg)
Mass conversion works by first converting the input value to kilograms using a known conversion factor, then dividing by the target unit conversion factor. For example, to convert pounds to grams: first multiply by 0.453592 to get kg, then divide by 0.001 to get grams.
Worked Examples
Example 1: Converting 1 Kilogram to All Units
Problem:Convert 1 kilogram to grams, pounds, ounces, stones, troy ounces, carats, and grains.
Solution:1 kg = 1000 g 1 kg = 2.2046 lb 1 kg = 35.2740 oz 1 kg = 0.1575 st 1 kg = 32.1507 oz t 1 kg = 5000 ct 1 kg = 15432.3584 gr
Result:1 kg = 1000 g = 2.2046 lb = 35.2740 oz = 5000 ct
Example 2: Converting 150 Pounds to Metric
Problem:A person weighs 150 pounds. Convert to kilograms, stones, and metric tons.
Solution:Kilograms = 150 * 0.45359237 = 68.0389 kg Stones = 150 / 14 = 10.7143 st Metric Tons = 68.0389 / 1000 = 0.0680 t Grams = 68038.86 g
Result:150 lb = 68.0389 kg = 10.7143 st = 0.0680 metric tons
Frequently Asked Questions
What is the difference between mass and weight?
Mass is a fundamental property of matter that measures the amount of substance in an object, while weight is the force exerted on that mass by gravity. Mass remains constant regardless of location (measured in kilograms), but weight changes depending on gravitational field strength (measured in newtons). On the Moon, your mass stays the same but you weigh about one-sixth of your Earth weight because the Moon gravitational pull is weaker. In everyday language, people often use mass and weight interchangeably, but in physics and engineering, the distinction is crucial. A 70 kg person has a weight of about 686 newtons on Earth but only 114 newtons on the Moon.
Why is the kilogram the SI base unit of mass?
The kilogram became the SI base unit of mass as part of the metric system established during the French Revolution in the 1790s. Originally defined as the mass of one liter of water at 4 degrees Celsius, it was later represented by a physical artifact called the International Prototype of the Kilogram (IPK), a platinum-iridium cylinder stored in Paris. In 2019, the kilogram was redefined based on the Planck constant, making it the last SI unit to be defined by a fundamental physical constant rather than a physical object. This change ensures that the kilogram definition will never drift over time due to surface contamination or wear of a physical standard.
How do you convert between metric and imperial mass units?
The key conversion factors between metric and imperial systems are: 1 kilogram equals 2.20462 pounds, and 1 pound equals 0.453592 kilograms. From these, you can derive other conversions: 1 ounce equals 28.3495 grams, 1 stone equals 6.35029 kilograms (14 pounds), and 1 metric ton equals 2204.62 pounds. For quick mental math, multiply kilograms by 2.2 to get approximate pounds, or divide pounds by 2.2 to get approximate kilograms. A useful benchmark is that 1 kilogram is roughly the mass of a liter of water, while 1 pound is about the mass of a medium apple or a baseball.
What are troy ounces and how do they differ from regular ounces?
A troy ounce is a unit of mass used specifically for precious metals like gold, silver, and platinum. One troy ounce equals 31.1035 grams, which is about 10 percent heavier than a regular (avoirdupois) ounce at 28.3495 grams. The troy system dates back to medieval Troyes, France, an important trading center. Confusingly, while a troy ounce is heavier than an avoirdupois ounce, a troy pound (12 troy ounces = 373.24 grams) is lighter than an avoirdupois pound (16 regular ounces = 453.59 grams). When gold prices are quoted per ounce, they always mean troy ounces, which is essential to understand when calculating the value of precious metals.
What is a carat and how is it used for measuring gemstones?
A carat is a unit of mass equal to exactly 200 milligrams (0.2 grams), used exclusively for measuring gemstones and pearls. The word comes from the carob seed, which was historically used as a balance weight because of its supposedly uniform mass. One carat equals 100 points, so a 0.50 carat diamond is also called a 50-point diamond. It is important not to confuse carats (mass) with karats (purity of gold). A carat of diamond is tiny in mass but can be extremely valuable: a one-carat round brilliant diamond typically measures about 6.5 mm in diameter. The price per carat increases exponentially with size because larger diamonds are exponentially rarer.
What is the difference between a short ton and a long ton?
A short ton (US ton) equals 2000 pounds or about 907.185 kilograms and is the standard ton used in the United States. A long ton (Imperial ton or UK ton) equals 2240 pounds or about 1016.047 kilograms and was traditionally used in the British Imperial system. A metric ton (tonne) equals exactly 1000 kilograms or about 2204.62 pounds, falling between the two. The naming can cause significant confusion in international trade and shipping, so specifying the type of ton is critical. In modern practice, the metric ton has become the international standard for most commercial purposes, though short tons remain common in US industries like coal mining and grain trading.
What is a grain as a unit of mass?
A grain is one of the oldest units of mass measurement, originally based on the mass of a single grain of barley or wheat. One grain equals exactly 64.79891 milligrams. Despite its antiquity, the grain remains actively used today in several fields: in pharmacy and medicine for precise drug dosages (aspirin tablets are often 5 grains or 325 mg), in ballistics for measuring bullet and powder charge weights (a typical 9mm bullet weighs about 115 grains), and in precious metals trading. The grain is the same unit in both the avoirdupois and troy systems, serving as a bridge between these two otherwise incompatible measurement systems.
Why would I need to know mass on other planets?
Knowing how mass translates to weight on other planets is important for space exploration, aerospace engineering, and physics education. While mass remains constant everywhere, the force you experience (weight) changes with gravity. Mars has 37.7 percent of Earth gravity, so equipment designed for Earth must be re-evaluated for Mars missions where everything feels lighter but still has the same inertia. Jupiter has 2.36 times Earth gravity, meaning a 70 kg person would feel as if they weighed 165 kg. Understanding these differences is crucial for designing landing systems, habitat structures, and even exercise regimens for astronauts who need to maintain bone density in low-gravity environments.
What are some useful mass benchmarks for everyday reference?
Having mental benchmarks for mass helps with quick estimation and unit verification. A paperclip is about 1 gram, a US nickel coin is exactly 5 grams, and a liter of water masses exactly 1 kilogram. A typical apple or baseball is about 200 grams (roughly 1 pound is 454 grams). A standard bag of sugar is 2 kilograms (about 4.4 pounds). An average adult human masses between 60 to 80 kilograms (132 to 176 pounds). A compact car masses about 1200 kilograms (1.2 metric tons), while an elephant masses about 5000 kilograms (5 metric tons). These reference points make it easy to sanity-check calculations and spot errors.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator · Editorial policy
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