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Endpoint Calculator
Find the missing endpoint of a line segment from the midpoint and one endpoint.
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Missing endpoint
Compare Your Options And Get Clear Answers
Find the missing endpoint of a line segment from the midpoint and one endpoint.
Endpoint Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: x2 = 2 xm – x1, y2 = 2 ym – y1.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Endpoint Quick Guide
Typical values for reference.
| Mid x | Mid y | Known x | Endpoint |
|---|---|---|---|
| 3 | 4 | 1 | (5.00, 6.00) |
| 0 | 0 | 5 | (-5.00, -2.00) |
| -2 | 1 | -6 | (2.00, 0.00) |
| 10 | 10 | 0 | (20.00, 18.00) |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Endpoint Calculator FAQ
Answers to common questions about this calculator.
Double the midpoint and subtract the known endpoint.
The average of the x values and of the y values.
Yes.
Yes, by the distance formula.