and Surface Gravity Ultra Calculator Scroll down for instructions.

I N S T R U C T I O N S
This calculator can solve for escape velocity, or a gravitational body's mass, radius or surface gravity and will automatically calculate the value of 'g'  the gravitational constant. (For Earth, the value of 'g' is 9.80665 meters per second^{2}.)

First click on what you are solving for. If you have just loaded the calculator and have not clicked on anything, the default settings are "ESCAPE VELOCITY", "tons" and "miles". Escape Velocity was chosen by default but you will have to click on "km/sec" and "kilograms" and then enter those two numbers. Click "CALCULATE" and your answers are: Escape Velocity = 3.13 miles/sec = 5.04 km/sec and its surface gravity is .382 that of Earth.
2) The planet Mercury's escape velocity is 4.25 kilometers per second and it has a radius of 1,516 miles. What is its mass?
Mass = 3.64 x 10^{20} tons = 3.30 x 10^{23} kilograms = .055 Earth
3) The planet Venus has an escape velocity of 6.5 miles per second and its mass is 4.87x 10^{24} kilograms.
What is its radius?
Radius = 3,690 miles = 5,940 kilometers and
You may change the number of significant figures displayed by changing the number in the box above. Most browsers, will display the answers properly but if you are seeing no answers at all, enter a zero in the box above, which will eliminate all formatting but at least you will see the answers.
