What is the formula to convert picas to rem?

First convert picas to points: pt = pc × 12. Then convert points to pixels: px = pt × (96 ÷ 72). Finally convert to rem: rem = px ÷ rootFontSizePx. Combined: rem = pc × 12 × (96 ÷ 72) ÷ rootFontSizePx. With the default 16px root, 1pc = 16px = 1rem.

Why does 1 pica equal 16px at the default root?

1 pica = 12 points. At 96 DPI (CSS reference pixel), 1 point = 96/72 = 4/3 px. So 1 pica = 12 × (4/3) = 16px. With a 16px root font size, 1 pica = 1rem exactly.

What root font size should I use?

Use 16px for the browser default. Some developers set html { font-size: 62.5%; } to get a 10px root (making 1rem = 10px for easier mental math). Use 18px or 20px for larger-base design systems.

How many rem is 6 picas at the default 16px root?

6pc × 12 = 72pt. 72pt × (96÷72) = 96px. 96px ÷ 16 = 6rem. So 6 picas = 6rem at the standard browser root font size.

What is the difference between pica, point, px, and rem?

Pica (pc) is a print unit equal to 12 points or 1/6 inch. Point (pt) is 1/72 inch. px is a screen pixel at 96 DPI. rem is relative to the root ( ) font size. rem is preferred in web CSS because it scales with user preferences.

Does this converter work for print CSS?

The 96 DPI assumption applies to screen CSS. For print stylesheets, browsers render at different DPI — but rem units are rarely used in print CSS where pt and mm are more natural.

Picas to rem Converter

Name: Picas to rem Converter
Availability: InStock
Author: Nham Vu

Enter a pica value and root font size to get the exact CSS rem equivalent instantly.

Convert Picas to rem

Picas (pc)

Root Font Size (px)

Default browser root font size is 16px.

Root Font Presets

Result

1 rem

1 pc × 12 × (96÷72) ÷ 16 = 1.000rem

Common Pica Sizes

rem values update as you change the root font size.

Picas (pc)	px (96 DPI)	rem (16px base)

Formula

rem = pc × 12 × (96 ÷ 72) ÷ rootFontSizePx

One pica = 12 points. One point = 96/72 ≈ 1.3333px at 96 DPI. With a 16px root, 1pc = 16px = 1rem exactly.

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Summary

Enter a pica value and root font size to get the exact CSS rem equivalent instantly.

How it works

Enter the number of typographic picas (pc) to convert.
Set the root font size in pixels — default is 16px (browser default).
The tool computes: px = pc × 12 × (96 ÷ 72), then rem = px ÷ rootFontSizePx.
Use the root font size presets (10px, 16px, 18px) for common CSS configurations.
Copy the rem result or browse the reference table for common pica sizes.

Use cases

Convert print column widths and margins from picas to rem for responsive CSS layouts.
Match typographic pica measurements from InDesign or QuarkXPress to web rem values.
Verify rem values when migrating print stylesheets to screen CSS.
Build a design token set by mapping standard layout pica sizes to rem.
Calculate rem equivalents for a non-standard root font size such as 10px or 18px.
Cross-check pica measurements between design software and a live CSS codebase.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu