Engineering & Science

Enter any two of voltage, current, resistance and power to find the other two.

Calculate voltage from current and resistance, or from power and current.

Calculate electric current (amps) from voltage and resistance, or from power and voltage.

Calculate resistance in ohms from voltage and current, or from power and current.

Calculate real, apparent and reactive power from voltage, current and power factor, single or three phase.

Calculate energy used in kWh (units) and its cost from power, hours and the rate per unit.

Find how long a battery will power your load from its Ah, voltage, usable charge and efficiency.

Find the turns ratio, secondary turns and primary and secondary currents of a transformer.

Calculate the area of a rectangle, square, triangle, circle, trapezoid, parallelogram or ellipse.

Calculate the volume of a cuboid, cube, cylinder, sphere, cone or pyramid in litres and cubic metres.

Estimate roof area and the number of sheets or tiles from the building size, pitch and overhang.

Calculate how much sand you need for an area and thickness, in cubic feet, cubic metres, tonnes and brass.

Convert between Celsius, Fahrenheit, Kelvin and Rankine.

Convert wind speed between km/h, m/s, mph and knots, with the Beaufort scale description.

Find sunrise, sunset, solar noon and twilight times for Indian cities or any coordinates.

See how long daylight lasts in any city on any date, and how it changed since yesterday.

Find the golden hour and blue hour times for photography in any Indian city.

Find the moon's phase, illumination and age for any date, and the next full and new moon.