Free Tools in This Category
Speed Converter
Convert km/h, mph, meters per second (m/s), knots (nautical miles/hr), and Mach numbers.
Pressure Converter
Convert PSI (pounds per sq inch), bar, Pascal (Pa), Kilopascal (kPa), atmospheres (atm), and mmHg.
Torque Converter
Convert Newton-meters (N·m), foot-pounds (ft-lb), inch-pounds (in-lb), and kilogram-force meters.
Power Converter
Convert mechanical horsepower (HP), metric horsepower (PS), Watts (W), Kilowatts (kW), and BTU/hr.
Time Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks, and Julian years.
The Physical Foundations of Mechanical & Fluid Dynamics
Modern engineering bridges metric (SI) and US customary mechanical specifications across four core dynamic domains:
| Physical Dimension | Metric (SI) Standard | Imperial Standard | Standard Conversion Multiplier |
|---|---|---|---|
| Speed / Velocity ($v$) | Kilometers per hour ($km/h$) / $m/s$ | Miles per hour ($mph$) | $1\text{ mph} \approx 1.60934\text{ km/h}$ | $1\text{ m/s} = 3.6\text{ km/h}$ |
| Fluid Pressure ($P$) | Bar / Pascal ($N/m^2$) | Pounds per square inch ($PSI$) | $1\text{ bar} = 100,000\text{ Pa} \approx 14.5038\text{ PSI}$ |
| Rotational Torque ($\tau$) | Newton-meter ($N\cdot m$) | Foot-pound ($ft\cdot lb$) | $1\text{ ft}\cdot\text{lb} \approx 1.35582\text{ N}\cdot\text{m}$ | $1\text{ N}\cdot\text{m} \approx 0.73756\text{ ft}\cdot\text{lb}$ |
| Mechanical Power ($P$) | Kilowatt ($kW$) | Horsepower ($HP$) | $1\text{ HP (mechanical)} \approx 745.7\text{ Watts} = 0.7457\text{ kW}$ |
Tool-by-Tool Guide to Physics & Engineering Tools
1. Speed Converter: Automotive & Aviation Velocity
The Speed Converter converts speed units across roadway, maritime, and supersonic regimes:
- KM/H to MPH: Crucial for driving rented automobiles overseas or cross-referencing European speed camera postings.
- Knots (kt): The universal standard for aviation and maritime navigation. $1\text{ knot} = 1\text{ nautical mile per hour} \approx 1.852\text{ km/h} \approx 1.151\text{ mph}$.
- Meters per Second (m/s): The fundamental SI unit used by civil engineers, ballistics experts, and weather meteorologists for wind gust reporting.
- Mach Number: Ratio of object speed to the speed of sound in air (approx. $1,235\text{ km/h}$ or $767\text{ mph}$ at $20^\circ\text{C}$).
2. Pressure Converter: Automotive Tires, Scuba Diving & HVAC
Whether inflating automobile tires to manufacturer cold specs, setting scuba regulator tank pressures, or charging air conditioning R410A refrigerants, use the Pressure Converter:
- PSI to Bar: Common passenger vehicle tire specs of $32\text{ to }35\text{ PSI}$ equal $2.2\text{ to }2.4\text{ bar}$.
- Atmospheres (atm) & Bar: $1\text{ atm} = 101,325\text{ Pa} = 1.01325\text{ bar} = 14.696\text{ PSI}$ (standard sea-level atmospheric pressure).
- Millimeters of Mercury (mmHg): The international standard for cardiovascular blood pressure readings and barometric vacuum suction.
3. Torque Converter: Automotive Mechanics & Fastener Specifications
Torque represents the rotational twisting force applied to an axis. Using an incorrect torque wrench setting can shear wheel lug studs, crack engine cylinder heads, or warp brake rotors.
The Torque Converter translates instantly between:
- Newton-meters (N·m): European and Asian automotive service manuals (e.g., German DIN specifications).
- Foot-pounds (ft-lb): American automotive manuals (e.g., standard lug nuts torqued to $80-100\text{ ft-lb} \approx 108-135\text{ N}\cdot\text{m}$).
- Inch-pounds (in-lb): Bicycle carbon fiber seatposts and sensitive electronics assembly ($1\text{ ft-lb} = 12\text{ in-lb}$).
4. Power Converter: Electric Vehicles, Dyno Ratings & HVAC
As the automotive industry transitions to Electric Vehicles (EVs), engine output is increasingly rated in kilowatts ($kW$) alongside traditional brake horsepower ($HP$). The Power Converter provides exact figures:
$1\text{ kW} = 1.34102\text{ Mechanical HP} = 1.35962\text{ Metric HP (PS/Pferdestärke)}$ | $1\text{ kW} = 3,412.14\text{ BTU/hr}$
5. Time Converter: Precision Milliseconds to Astronomical Years
The Time Converter handles multi-order duration conversions for software benchmark execution times ($ms$, $\mu s$), network latency pings, video framerates, and chronological spans.