Conversion Guides
Evergreen guides that explain how measurement systems work, how to convert accurately, and the common mistakes to avoid — from the metric system to digital storage and fuel economy.
Measurement Basics
The Metric System Explained
How the meter, kilogram, and liter form a decimal system used by most of the world.
Read guideImperial vs Metric: What's the Difference?
Why two measurement systems coexist and how to convert between them confidently.
Read guideSI Units Explained
The seven base units that underpin all modern measurement and science.
Read guideWhy the United States Uses Different Units
The historical reasons America kept customary units while the world went metric.
Read guideSignificant Figures Explained
How many digits actually matter in a measurement or conversion result.
Read guideMeasurement Precision vs Accuracy
Two words that are often confused but mean very different things.
Read guideHow Rounding Affects Conversions
When and how to round converted values without losing meaningful information.
Read guideScientific Notation Explained
A compact way to write very large and very small numbers used throughout science.
Read guideDimensional Analysis: Converting With Confidence
A reliable method that uses unit cancellation to convert any quantity correctly.
Read guideLength & Distance
Metric Length Units Explained
Millimeters, centimeters, meters, and kilometers — and when to use each.
Read guideInches, Feet, and Yards Explained
The everyday US length units and how they relate to each other.
Read guideMiles vs Kilometers
Why the two distance units differ and how to convert between them quickly.
Read guideNautical Miles Explained
Why ships and planes use a different mile from the rest of us.
Read guideWeight & Mass
Mass vs Weight: The Real Difference
Why your weight changes on the Moon but your mass doesn't.
Read guidePounds vs Kilograms
Converting body weight and shipping weight between the two systems.
Read guideOunces vs Fluid Ounces
One measures weight, the other volume — the confusion that ruins recipes.
Read guideMetric Tons vs US Tons vs Imperial Tons
Three things called a 'ton' that are all different weights.
Read guideCarats Explained
The unit gemstones are measured in, and its link to gold purity.
Read guideTemperature
Celsius vs Fahrenheit
Why the two temperature scales exist and how to convert between them.
Read guideKelvin Explained
The absolute temperature scale used in science, starting from absolute zero.
Read guideUnderstanding Absolute Zero
The theoretical lowest temperature and why it can never quite be reached.
Read guideCommon Oven Temperature Conversions
Converting oven settings between Celsius, Fahrenheit, and gas marks for recipes.
Read guideVolume & Capacity
Area
Speed
Digital Data
Bits vs Bytes
The 8-to-1 ratio that explains internet speed confusion.
Read guideKB, MB, GB, and TB Explained
How digital storage units scale — and the decimal-vs-binary trap.
Read guideMB vs MiB Explained
Decimal megabytes versus binary mebibytes — and why the difference grows.
Read guideMbps vs MB/s
Why your internet speed number never matches your download speed.
Read guideWhy Storage Devices Show Less Space Than Advertised
The decimal-vs-binary counting gap that costs you gigabytes.
Read guideEnergy & Power
Watts vs Kilowatts
How electrical power is measured and what your bill really counts.
Read guideEnergy vs Power
Why these two words are not interchangeable.
Read guideJoules Explained
The SI unit of energy and how it connects to calories and kilowatt-hours.
Read guideCalories vs Kilocalories
The food-label trick that makes 'Calories' and 'calories' different things.
Read guideKilowatt-Hours Explained
The unit on every electric bill, and how to estimate your usage.
Read guideHorsepower Explained
The engine-power unit and what it really means.
Read guideBTUs Explained
The heating and cooling unit, and how it compares to watts and joules.
Read guidePressure
Fuel Economy
MPG Explained
What miles per gallon really tells you about fuel use.
Read guideL/100km Explained
The fuel-per-distance measure used in Europe and why lower is better.
Read guideWhy MPG and L/100km Convert Differently
The inverse relationship that means you divide, not multiply.
Read guideUS MPG vs Imperial MPG
Why the same car gets different MPG numbers in the US and UK.
Read guideCooking Measurements
Science & Engineering
Degrees vs Radians
Two ways to measure angles, and why science prefers radians.
Read guideHertz Explained
The unit of frequency, from radio waves to processor speeds.
Read guideTorque Units Explained
Newton-meters and pound-feet — how engine turning force is measured.
Read guideNewtons Explained
The SI unit of force and how to picture it.
Read guideDensity Explained
Why some things float and others sink — mass packed into a volume.
Read guide