Make sense of units, flow rates, engine measurements and mathematical relationships.
CC to horsepower: why there is no exact conversion
See why displacement is not power, build a hypothetical horsepower range, and check it against the idea of a tested engine rating.
How to convert m³/h to CFM
Follow an airflow through a cubic-volume conversion and a 60-minute time change, then check the answer in reverse.
How to convert m³/h to GPM: US and imperial gallons
Convert a pump flow step by step and see why US and imperial gallons give different counts for the same water.
Carpet area: estimates, measurements, and the 70% rule
See the difference between estimating carpet area from a built-up area and measuring usable floor space directly. Animated floor plans show both approaches and their limits.
How to convert millimeters to fractional inches
Convert millimeters to decimal inches, round to a chosen ruler subdivision, and measure the rounding error. Animated subdivisions show why precision changes the answer.
How to convert sheet-metal gauge to millimeters
Learn why sheet-metal gauge must be looked up in a material-specific table before converting the listed thickness to millimeters. The same gauge number can mean different thicknesses.
How to convert kilograms to viss
Convert kilograms into the traditional Myanmar unit viss, reverse the calculation, and understand how rounded conversion factors affect the result.
Wheel horsepower to engine horsepower: the calculation
Use an assumed drivetrain loss to estimate engine power from wheel horsepower. A power-flow diagram shows why dividing by the retained fraction differs from adding a percentage.
How to calculate kilograms from a length in feet
Calculate mass from a length and a matching mass-per-length specification. Animated cable segments explain why feet alone cannot convert to kilograms.
How to calculate mass from dimensions in centimeters
Turn centimeter dimensions into volume, multiply by density, and convert grams to kilograms. A building block animation explains cubic units and how hollow space changes the answer.