Guides and explainers for math, finance, and unit conversion — linked to the calculators and formulas you can use right away.
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Converter guides·11 min read
Reliable conversion is factor arithmetic plus the right identity for temperature — not memorizing every pair by heart.
Converter guides·10 min read
Length conversion is multiply-or-divide by a known factor — keep units canceling and chain through meters when you lack a direct pair.
Temperature units are offset scales. Convert with the full formula — never treat Celsius ↔ Fahrenheit as a single multiply alone.
Storage labels mix decimal (1000-based) and binary (1024-based) prefixes. Knowing which system you are in prevents “missing” gigabytes.
Kitchen volume units are regional. Convert with US cup/spoon factors, weigh when precision matters, and treat oven °C/°F as true temperature conversions.
Speed units are length per time. Convert by changing the length unit, the time unit, or both — or use a single known factor such as km/h ↔ mph.
Civil time is UTC plus an offset that can change with daylight saving. Convert by shifting hours carefully and naming the zone, not only the city clock face.
Voltage, current, and resistance form Ohm’s law. Convert metric prefixes carefully, and keep V, A, and Ω matched in the same formula.
Everyday “weight” conversions on Earth use mass factors: kilograms ↔ pounds and grams ↔ ounces. Multiply or divide — and check direction.