Perform fast calculations with our user-friendly online calculator! Conveniently crunch numbers and solve equations instantly. Ideal for quick math tasks, our tool simplifies your daily computations effortlessly. Try our intuitive calculator for accurate results on the go!
Use our free magnetic field calculator to calculate magnetic field strength easily. Accurate formulas, step-by-step results, and instant answers in tesla.
A magnetic field calculator is a simple online tool that helps you find the strength of a magnetic field without doing complex physics math by hand. Magnetic fields are everywhere. They exist around electric wires, electronic devices, motors, generators, and even inside the Earth itself. Many students, engineers, and curious learners often ask how to calculate the magnetic field correctly and how strong a magnetic field really is. That is why we developed this magnetic field calculator, so anyone can calculate magnetic field values easily, accurately, and in seconds.
Our calculator is designed for real-world use. It follows standard physics laws and converts all inputs into correct SI units before calculating the result. This makes the output reliable and easy to understand, even if you are new to electromagnetism.
A magnetic field is a physical field produced by moving electric charges and electric currents. It is represented by the symbol B and measured in tesla (T). The magnetic field shows how strong the magnetic force is and in which direction it acts.
Magnetic fields are responsible for many everyday technologies. They allow electric motors to spin, speakers to produce sound, and medical MRI machines to scan the human body. Understanding magnetic fields is essential in physics, electrical engineering, and electronics.
The magnetic field is calculated using different formulas depending on the situation. There is no single formula that works for every case. That is why this magnetic field calculator supports multiple calculation types, such as straight wires, circular loops, solenoids, and moving charges.
All magnetic field formulas are based on fundamental electromagnetic laws, especially Ampère’s Law and the Biot–Savart Law. The key constant used in these formulas is the permeability of free space, written as μ₀.
The value of μ₀ is
μ₀ = 4π × 10⁻⁷ T·m/A
This constant ensures that the magnetic field calculation is scientifically accurate.
For a long straight wire carrying electric current, the magnetic field at a distance from the wire is calculated as:
B = (μ₀ × I) / (2π × r)
Here, B is the magnetic field in tesla, I is the current in amperes, and r is the distance from the wire in meters.
For a circular loop of wire carrying current, the magnetic field at the center of the loop is:
B = (μ₀ × I) / (2 × R)
If the loop has multiple turns, the formula becomes:
B = (μ₀ × N × I) / (2 × R)
In this case, N is the number of turns and R is the radius of the loop.
For a long solenoid, the magnetic field inside is nearly uniform and calculated using:
B = μ₀ × n × I
Here, n is the number of turns per meter, calculated as N divided by L, where L is the length of the solenoid.
When an electric charge moves, it creates a magnetic field. If the motion is perpendicular to the distance vector, the magnetic field is:
B = (μ₀ × q × v) / (4π × r²)
In this formula, q is the electric charge, v is the velocity, and r is the distance from the charge.
First, select the type of magnetic field calculation you want to perform, such as straight wire, circular loop, solenoid, or moving charge.
Next, enter the required values like current, distance, radius, number of turns, or velocity. You can choose the appropriate units, and the calculator will automatically convert them into SI units.
After entering all values, click the calculate button. The calculator instantly applies the correct magnetic field formula and shows the final result in tesla.
You will also see the formula used and a step-by-step explanation of how the magnetic field value was calculated. This makes the tool useful for both learning and practical calculations.
Suppose a straight wire carries a current of 5 amperes, and you want to calculate the magnetic field at a distance of 0.1 meters from the wire.
The formula used is:
B = (μ₀ × I) / (2π × r)
Substituting the values:
μ₀ = 4π × 10⁻⁷ T·m/A
I = 5 A
r = 0.1 m
After calculation, the magnetic field is approximately:
B = 1 × 10⁻⁵ tesla
This example shows how easily the magnetic field calculator can handle real physics problems without manual calculations.
A magnetic field of 1 tesla is extremely strong. For comparison, the Earth’s magnetic field is about 0.00005 tesla. Small fridge magnets are much weaker than 1 tesla. MRI machines in hospitals often operate between 1.5 and 3 tesla, which is why they require strict safety measures. A 1 tesla magnetic field can strongly affect metal objects and electronic devices.
This magnetic field calculator is built for accuracy and simplicity. It uses correct physics equations, proper unit conversions, and clear output formatting. You do not need advanced knowledge of electromagnetism to use it. The calculator saves time, reduces errors, and helps you understand how magnetic fields behave in different situations.
It is ideal for students, teachers, engineers, and anyone working with electrical or magnetic systems.
The magnetic field calculator is a reliable and easy-to-use tool for calculating magnetic field strength in tesla. It supports multiple real-world scenarios and uses scientifically accurate formulas. Whether you are learning physics or solving practical problems, this calculator helps you calculate magnetic fields quickly and correctly without confusion.
A magnetic field is measured in tesla (T) in the SI unit system.
Yes, the calculator follows standard physics formulas used in textbooks and exams.
Yes, all inputs are converted into SI units before calculation.
A higher tesla value means a stronger magnetic field, which can be dangerous near metal objects and electronics, especially in medical or industrial environments.