Diameter to Circumference Reference Values

Convert a circle diameter directly to circumference using C = πd.

Author

Prof. Rajesh Sharma

Math editorial contributor

Indian agricultural economist from IARI New Delhi, advising governments on food security under climate change

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 Circumference reference values
DiameterCircumference
1 units3.1416 units
2 units6.2832 units
3 units9.4248 units
4 units12.5664 units
5 units15.708 units
6 units18.8496 units
7 units21.9911 units
8 units25.1327 units
9 units28.2743 units
10 units31.4159 units
11 units34.5575 units
12 units37.6991 units
13 units40.8407 units
14 units43.9823 units
15 units47.1239 units
16 units50.2655 units
17 units53.4071 units
18 units56.5487 units
19 units59.6903 units
20 units62.8319 units

Frequently Asked Questions

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

What does the Diameter to Circumference calculator do?

It calculates converting measured diameters to perimeter length for circular parts and layouts from the values you enter.

What formula does the Diameter to Circumference calculator use?

Circumference = π × diameter.

What inputs are valid?

Enter a positive diameter greater than zero.

When would I use this?

converting measured diameters to perimeter length for circular parts and layouts

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.