Slope Calculator
Use your own numbers after reviewing the formula and worked example.
Quick answer
Slope is vertical change divided by horizontal change.
Formula or method
Keep units, percentages and time periods consistent. The formula is useful as a transparent check on the calculator result and helps explain why changing one input changes the answer.
Step-by-step
- Label the two points.
- Subtract y-values in one order.
- Subtract x-values in the same order.
- Divide rise by run.
Worked example
For (2,3) and (6,11), slope=(11−3)/(6−2)=2.
How to interpret the result
Positive slope rises left-to-right; zero is horizontal; a zero denominator is a vertical line with undefined slope.
When the answer is used for a purchase, loan, payroll decision, construction order, school grade, health estimate or other real-world choice, verify the assumptions that matter in that context. Accurate arithmetic still depends on accurate inputs.
Common mistakes
- Changing subtraction order in only one part.
- Calling vertical slope zero.
- Mixing coordinate pairs.
Frequently asked questions
Horizontal slope?
Zero.
Vertical slope?
Undefined.
Does point order matter?
Not if used consistently.