Why does an unrotated SVG circle start at the 3 o'clock position?

In standard SVG trigonometry, 0 radians corresponds to the positive X-axis (the 3 o'clock position). Rotating the SVG element by `-90deg` shifts the start point to the top (12 o'clock).

Updated: August 2026 • Verified v1.2

SVG Circular Progress Bar & Radial Gauge Ring Calculator

Creative & DesignDesign

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C = 2 * PI * r; Dashoffset = C - (Percentage / 100) * C; ViewBox = (r + strokeWidth) * 2

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Understanding Your Results

Calculates circle circumference, exact `stroke-dashoffset` for the target percentage, computes padded viewBox dimensions, displays a live interactive progress preview, and exports copy-ready React and HTML/CSS snippets.

Practical Guidance & Next Steps

Rotating the SVG by `-90deg` (`transform: rotate(-90deg)`) ensures the progress arc starts at the 12 o'clock top position rather than 3 o'clock.

What is this?

A creative web design utility that calculates circle circumference and stroke-dashoffset math for responsive SVG radial progress rings.

How does it work?

1. Adjust circle radius, stroke width, and percentage. 2. Choose stroke color and line cap style (round or butt). 3. View the live animated gauge and copy the React component or HTML snippet.

Why use it?

Eliminates mathematical guesswork when building dashboard KPI meters and fitness activity rings.

Technical Scope & Calculation Limitations

Generates SVG 1.1 / 2.0 circular geometry code.

Frequently Asked Questions

First, the circumference is calculated as `C = 2 * Math.PI * radius`. Then, the dashoffset is calculated as `C - (percentage / 100) * C`. When `stroke-dasharray` is set to `C`, this reveals exactly the desired arc length.

Windows Desktop & Widget Options