Diameter to Radius Reference Values

Convert diameter to radius with the relationship r = d / 2.

Author

Dr. Mariam Diallo

Math editorial contributor

Senegalese sociolinguist with a doctorate from Sorbonne, studying code-switching in multilingual urban communities

Reviewed for accuracy by

Dr. Samuel Okafor

Math content reviewer

Nigerian-Canadian data scientist with a PhD from the University of Toronto, building ML models for early cancer detection

Last updatedFebruary 22, 2026

PublishedFebruary 22, 2026

Table of Contents

  1. All value pages
  2. Reference table
  3. FAQs
  4. Methodology and review
  5. Related conversions

Reference Value Index

This page lists 20 reference values for quick browsing and lookup.

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All Reference Values

Reference Table

Diameter to Radius reference values
DiameterRadius
2 units1 units
4 units2 units
6 units3 units
8 units4 units
10 units5 units
12 units6 units
14 units7 units
16 units8 units
18 units9 units
20 units10 units
22 units11 units
24 units12 units
26 units13 units
28 units14 units
30 units15 units
32 units16 units
34 units17 units
36 units18 units
38 units19 units
40 units20 units

Frequently Asked Questions

Frequently asked questions for Diameter to Radius and its reference values.

What does the Diameter to Radius calculator do?

It calculates converting measured diameter values into radius for geometry formulas from the values you enter.

What formula does the Diameter to Radius calculator use?

Radius = Diameter / 2.

What inputs are valid?

Enter a non-negative or positive diameter value. For physical circles, diameter should be positive.

When would I use this?

converting measured diameter values into radius for geometry formulas

Methodology and Review

Each row on this page links to a value detail page derived from the same conversion data file as the main calculator and reference table. This reduces inconsistencies across page variants.

Editorial metadata and structured data are rendered across the converter page and linked value pages. Review policies are documented in our review process and editorial policy.