Last updated: July 31, 2026
Endpoint Calculator
Creators
Dharmendra SinghReviewers
Creators
Dharmendra SinghReviewers
Creators
Dharmendra SinghReviewers
Creators
Dharmendra SinghReviewers
Formula
x2 = 2*mx - x1; y2 = 2*my - y1
Where:
- mx=mx
- my=my
- x1=x1
- y1=y1
Worked Examples
Positive coordinates
Midpoint (3,4), known endpoint (1,2).
- 1x2 = 2(3)-1
- 2y2 = 2(4)-2
Mixed signs
Midpoint (-1,2), endpoint (3,-4).
- 1x2 = -2-3
- 2y2 = 4-(-4)
Decimal coordinates
Midpoint (2.5,-1.5), endpoint (0.5,3).
- 1Apply both formulas directly
Introduction
Find the unknown endpoint of a segment when midpoint and one endpoint are known.
Formula and Method
Endpoint Calculator uses: x2 = 2*mx - x1; y2 = 2*my - y1
Enter all required inputs
Apply the underlying math formula(s)
Compute supporting terms where needed
Round numeric outputs for stable display
Input Fields
Provide values for: mx, my, x1, y1.
- 1
mx: mx
- 2
my: my
- 3
x1: x1
- 4
y1: y1
Output Fields
The calculator returns: x2, y2.
- 1
x2: x-coordinate of the missing endpoint
- 2
y2: y-coordinate of the missing endpoint
Validation Rules
Input validation is applied before calculation to prevent invalid math states.
All coordinates must be finite numbers.
Uses midpoint rearrangement exactly (no approximation).
Supports negative and decimal coordinates.
Outputs are rounded to 6 decimals.
How to Use This Calculator
Fill in the inputs, run the calculator, and review primary output first.
Enter the required values
Click calculate
Check the primary output
Use example scenarios for verification
Practical Uses
This calculator supports learning, quick checks, and day-to-day technical problem solving.
Homework and exam preparation
Engineering and science sanity checks
Classroom demonstrations
Fast recalculation with different inputs
FAQs
What does the Endpoint Calculator compute?
Find the unknown endpoint of a segment when midpoint and one endpoint are known.
Which inputs are required?
Required inputs: mx, my, x1, y1.
How should I format numbers?
Use finite numeric values; decimals and negative numbers are allowed unless restricted by validation rules.
How are results rounded?
Numeric outputs are rounded to about 6 decimal places for readability.
Why might I see an error?
All coordinates must be finite numbers.
Can I use this for learning and verification?
Yes. Use the examples and formula section to verify manual calculations quickly.