Engineering Calculators

Calculate elastic deflection for simply supported and cantilever beams under common loading cases.

Calculate Darcy-Weisbach pressure loss with Reynolds number, friction factor and minor losses.

Estimate preliminary HVAC cooling load from envelope, ventilation, people, lighting and equipment gains.

Calculate engine CC, litres and cubic inches from bore, stroke and cylinder count.

Calculate 1-phase or 3-phase motor current, starting current and a preliminary breaker rating.

Check axial stress, effective length, slenderness ratio and Euler buckling reference.

Find an AC motor's speed from its number of poles and supply frequency, including slip.

Find the driven pulley speed or the pulley size needed to reach a target RPM.

Calculate gear ratio, output speed and torque for a gear pair or a gearbox.

Find the belt length needed between two pulleys from their diameters and centre distance.

Size an air compressor from tool demand and duty cycle, convert CFM to L/min or m³/h, and check tank runtime between PSI limits.

Convert between bar, psi, kPa and metres of water head — and see the pressure at the bottom of a tank.

Work out your vehicle's mileage, the fuel needed for a trip and what it will cost.

Calculate 1-phase or 3-phase motor current, starting current and a preliminary breaker rating.

Find the pump horsepower needed to lift water to your tank from the flow rate, total height and pipe losses.

Convert a pump's flow between litres per minute, litres per hour, m³/h and gallons, and see how long a tank takes to fill.

Choose the right pipe diameter for a given water flow so the velocity stays safe and pressure loss is low.

Calculate how many litres of water a pipe holds and how long it takes to flush or fill it.

Calculate how long a water tank takes to fill from tank capacity, current water level and pump flow. You can also find the flow rate needed for a target filling time.

Calculate Darcy-Weisbach pressure loss with Reynolds number, friction factor and minor losses.

Calculate hydraulic, shaft and motor target power from flow, head, density and efficiency.

Calculate elastic deflection for simply supported and cantilever beams under common loading cases.

Calculate elastic flexural stress from bending moment, second moment of area and extreme-fibre distance.

Calculate support reaction, maximum shear and bending moment for common beam cases.

Estimate preliminary footing plan area from service load and allowable soil bearing pressure.

Estimate required section modulus and second moment of area before selecting a steel section.

Check axial stress, effective length, slenderness ratio and Euler buckling reference.

Calculate engine CC, litres and cubic inches from bore, stroke and cylinder count.

Calculate compression ratio from swept volume and clearance volume.

Convert horsepower, torque and RPM using standard power relationships.

Solve bore, stroke and displacement relationships for reciprocating engines.

Estimate preliminary HVAC cooling load from envelope, ventilation, people, lighting and equipment gains.

Size round and rectangular ducts from airflow and target air velocity.

Calculate density, unit weight and specific gravity from mass and volume.

Estimate asphalt volume, compacted tonnes and order quantity including waste allowance.