Rearrange & Solve Calculator
Pick a formula, choose the variable you want to isolate, then enter the known values.
What this rearrange the equation calculator does
Rearranging equations means isolating one variable so you can calculate it from known values. This calculator helps you do exactly that for common algebra, physics, and engineering formulas. Instead of manually moving terms around every time, you can choose a formula, select the unknown variable, and instantly get both the rearranged equation and the computed result.
How to use it
- Select the equation from the Formula menu.
- Choose the variable to isolate in Solve for.
- Enter all other required numbers.
- Click Calculate to see the rearranged form and answer.
Supported equations
1) Linear equation
y = m·x + b (slope-intercept form)
2) Newton's second law
F = m·a
3) Ohm's law
V = I·R
4) Pressure equation
P = F / A
5) Distance-speed-time
d = v·t
6) Rectangle area
A = l·w
Quick examples
Example: Solve for resistance
If V = 12 volts and I = 2 amps in V = I·R, then:
R = V / I = 12 / 2 = 6 ohms.
Example: Solve for time
If d = 150 km and v = 60 km/h in d = v·t, then:
t = d / v = 150 / 60 = 2.5 hours.
Best practices when rearranging equations
- Apply the same operation to both sides of the equation.
- Watch for division-by-zero conditions before calculating.
- Keep units consistent (e.g., meters with seconds, volts with amps).
- Use parentheses when moving grouped terms.
Common mistakes to avoid
The most frequent errors are sign mistakes and dividing by a value that is zero. This tool checks for undefined operations and alerts you when an equation cannot be solved with the values entered.
Why this calculator is useful
Whether you're studying algebra, preparing for physics exams, or solving practical work problems, quickly rearranging equations saves time and reduces mistakes. You can focus on understanding relationships between variables rather than repeatedly doing symbolic manipulation by hand.