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How to Convert Inches to cm
Formula, quick reference table, and everyday uses for screen sizes, height, and woodworking.
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How to Convert Feet to Meters
Room dimensions, aviation altitude, and sports field measurements with the exact 0.3048 m factor.
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How to Convert Pounds to kg
Body weight, luggage limits, and fitness contexts—plus mass vs weight explained.
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How to Convert Celsius to Fahrenheit
Weather, cooking ovens, and body temperature with both conversion formulas.
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How to Convert Gallons to Liters
US vs UK gallons, fuel economy, and liquid volume with distinct conversion factors.
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How to Convert Miles to Kilometers
Road signs, running distances, and speed limits when traveling between metric and customary countries.
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How to Convert Ounces to Grams
Cooking, postage, and precious metals—distinguishing mass ounces from fluid ounces.
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How to Convert Square Feet to Square Meters
Real estate floor plans, apartment listings, and HVAC sizing across US and metric markets.
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Metric vs Imperial: Complete Guide
History, which countries use what, when to use each system, and a practical conversion philosophy.
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SI Prefixes Explained
Kilo, milli, mega, micro and how they combine with base units like mm, km, mg, and kg.
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US vs UK Units
Gallon and pint size differences, ton vs tonne, and spelling variations across the Atlantic.
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Cooking Conversions
Cups, tablespoons, grams, and ounces—why weight beats volume for flour and common recipe factors.
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Famous Unit Conversion Failures
Mars Climate Orbiter, Gimli Glider, medical dosing errors, and lessons for safe practice.
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Why Unit Conversions Matter
Global communication, safety, commerce, and education—why getting units right is never trivial.
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Conversion Tables & Formulas
Quick-reference tables for length, mass, volume, temperature, and area conversion factors.
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Common Unit Conversion FAQs
Answers about using tounits.com, accuracy, US vs UK gallons, offline use, and reporting errors.
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Interesting History of Units
Origins of the meter, kilogram, inch, mile, gallon, and how modern SI definitions replaced physical prototypes.