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.
How to calculate travel time from kilometers
Use distance and average speed to calculate time, turn decimal hours into minutes, and account for stops or different travel speeds.
How to estimate stories from building height
Estimate stories from building height using an assumed floor-to-floor height. Animated examples show equal floors, partial remainders, a taller lobby and roof features that change the estimate.
How to convert inch fractions to millimeters
Convert a fractional or mixed-number inch measurement to millimeters using the exact 25.4 mm per inch relationship. See the fraction and the metric length on the same ruler.
How to convert surface speed to RPM
Turn linear speed at a rotating surface into revolutions per minute by finding the distance traveled in each revolution. Follow diameter units and compare two wheel sizes.
How to estimate distance from liters of fuel
Estimate distance using either kilometers per liter or liters per 100 kilometers, recognize their reciprocal relationship, and keep usable fuel and real-world variation visible.
How to convert motor horsepower to kVA
Distinguish shaft horsepower, electrical real power, and apparent power. Work a 10 hp example with 90% efficiency and 0.8 power factor, and see why the idealized shortcut is lower.
How to convert lb/hr to GPM using density
Bridge mass flow and volume flow with fluid density, work 600 lb/hr of water at an approximate room-temperature density, then contrast a lighter fluid and reverse-check units.
How to calculate percentage of a target achieved
Turn actual-versus-target into an achievement percentage, reverse-check a 75% example, show results above 100%, and distinguish lower-is-better budget measures.
How to find kilograms from inches, area and density
Learn why inches cannot directly become kilograms, then use cross-sectional area and material density to calculate the mass of a ten-inch steel bar.
How to calculate three-phase power
See why √3 appears in a balanced three-phase calculation, work through 400 V and 100 A at 0.8 power factor, and separate kVA, kW and kVAR.
How to convert grams to viss
Convert between grams and Myanmar viss by dividing or multiplying by about 1,632.93 grams per viss, then verify a two-viss example and distinguish mass from liters.
How to calculate tons of material from square feet
Turn a measured footprint and layer depth into volume, then use a material’s quoted density to estimate U.S. short tons. See a five-ton example and why cooling tons are different.
How to find cube side length from mass and density
Learn why kilograms cannot convert directly to centimeters. Use density to find volume, then take the cube root to find the side length of a uniform cube, with an 8 kg worked example.
How to convert newtons to kilograms using gravity
A newton is force and a kilogram is mass. Learn when weight can reveal mass, divide by the local gravitational acceleration, check a 196.2 N example, and see why a push is different.
How to convert air watts to pascals using airflow
Air watts and pascals measure different quantities. Use airflow at the same operating point to estimate pressure difference, follow a 120 AW and 20 L/s example, and see why a sealed inlet or different flow changes the answer.
How to calculate a square-root grade curve
See why a square-root curve maps a 64% raw grade to 80%, how its boost varies across scores, and how to reverse-check the result.
How to convert HBW to HRC for steel
Understand why Brinell and Rockwell C conversion depends on the material. A steel table lookup and a 300 HBW interpolation show an approximate 32 HRC result, sensible rounding, and the limits of converted values.
Can you convert L/min to psi? Flow rate and pressure explained
Learn why L/min cannot directly convert to psi, then calculate an ideal water-nozzle pressure difference with complete unit conversions, Bernoulli arithmetic and a same-flow comparison.
How to convert inches to decimal feet
Convert whole and fractional inches into decimal feet with an accurate twelve-inch ruler, a 5 ft 7⅜ in worked example, reverse check and rounding guidance.
How to convert GSM to kilograms
Learn why grams per square metre needs an area to become kilograms. Follow a 200 GSM fabric example, handle multiple pieces and check the units.
Can you convert centimeters to pounds? The missing measurement
Length alone cannot determine mass. Build pounds from a chain's length and linear density, verify the units and arithmetic, compare two materials, and see the separate volume-and-density route.