Free Fall Calculator
Calculate the distance fallen, final velocity, and time of fall for an object in free fall under gravity, neglecting air resistance.
This free online free fall calculator provides instant results with no signup required. All calculations run directly in your browser — your data is never sent to a server. Enter your values below and see results update in real time as you type. Perfect for everyday calculations, homework, or professional use.
How to Use This Calculator
Enter your input values
Fill in all required input fields for the Free Fall Calculator. Most fields include unit selectors so you can work in your preferred unit system — metric or imperial, whichever matches your problem.
Review your inputs
Double-check that all values are correct and that you have selected the right units for each field. Incorrect units are the most common source of calculation errors and can produce results that are off by factors of 2, 10, or more.
Read the results
The Free Fall Calculator instantly computes the output and displays results with units clearly labeled. All calculations happen in your browser — no loading time and no data sent to a server.
Explore parameter sensitivity
Try adjusting individual input values to see how the output changes. This is a quick and effective way to develop intuition about how different parameters influence the result and to identify which inputs have the largest effect.
Formula Reference
Free Fall Calculator Formula
See calculator inputs for the governing equation
Variables: All variables and their units are labeled in the calculator interface above. Input fields accept values in multiple unit systems — select your preferred unit from the dropdown next to each field.
When to Use This Calculator
- •Use the Free Fall Calculator when you need accurate results quickly without the risk of manual computation errors or unit conversion mistakes.
- •Use it to verify calculations made by hand or in spreadsheets — an independent check can catch errors before they lead to costly decisions.
- •Use it to explore how changing input parameters affects the output — a quick way to develop intuition and identify the most influential variables.
- •Use it when collaborating with others to ensure everyone is working from the same numbers and applying the same assumptions.
About This Calculator
The Free Fall Calculator is a free, browser-based calculation tool for engineers, students, and technical professionals. Calculate the distance fallen, final velocity, and time of fall for an object in free fall under gravity, neglecting air resistance. It implements standard formulas and supports both metric (SI) and imperial unit systems with automatic unit conversion. All calculations are performed instantly in your browser with no data sent to a server. Use this calculator as a quick reference and sanity-check tool during design, analysis, and learning. Always verify results against primary engineering references and applicable standards for any safety-critical application.
About Free Fall Calculator
The Free Fall Calculator determines the distance fallen and velocity reached by an object falling under gravity alone, ignoring air resistance. Free fall is a fundamental concept in mechanics, describing the motion of any object influenced only by gravitational force. On Earth, all objects in free fall accelerate at approximately 9.81 m/s² toward the center of Earth, regardless of their mass — a surprising truth first demonstrated by Galileo. This calculator applies the kinematic equations for uniformly accelerated motion.
The Math Behind It
Formula Reference
Distance
d = v₀t + ½gt²
Variables: v₀ = initial velocity, g = 9.81 m/s², t = time
Velocity
v = v₀ + gt
Variables: v = final velocity
Worked Examples
Example 1: Drop from Rest
Object dropped from rest, falls for 3 seconds
Falls 44.1 m and reaches 29.4 m/s after 3 seconds.
Example 2: Thrown Down
Ball thrown down at 5 m/s, falls for 2 s
Falls 29.6 m and reaches 24.6 m/s.
Common Mistakes & Tips
- !Forgetting that g is constant (9.81 m/s²) and doesn't depend on mass.
- !Confusing 'free fall' with 'falling due to gravity.' Free fall means no other forces including no air resistance.
- !Using g = 10 for rough estimates but expecting precise answers.
Related Concepts
Used in These Calculators
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Frequently Asked Questions
Why does a feather fall slower than a bowling ball?
Air resistance. In a vacuum, both fall at the same rate. Apollo 15 astronaut David Scott famously demonstrated this on the Moon.
What is terminal velocity for a human?
About 55 m/s (200 km/h) in belly-down position. Head-down dives can reach 90+ m/s.