A Stone Calculator is a lightweight web tool that converts between stones (st), pounds (lb) and kilograms (kg), and — when included here — tracks and visualizes saved weight entries so users can convert measurements and review weight history at a glance.

How to Use the Stone Calculator — Convert and Track Weight Easily

Why this calculator exists

Many users in the UK and Ireland — and people familiar with Imperial units — still think of body weight in stones and pounds. The stone equals 14 pounds (approximately 6.35029 kg), and while the metric system is prevalent, quick, reliable conversion remains useful for clinical settings, fitness tracking, and everyday reference. Authoritative references and conversion charts from major health services and reference works confirm the conversion values used here. Encyclopedia Britannica+1

Quick overview — what the tool does

• Convert single values between kilograms, pounds, stones (decimal) and stones + pounds.
• Save timestamped weight entries to your browser (localStorage).
• Visualize your saved entries as an interactive Plotly chart (zoom/pan/hover).
• Export history as CSV for spreadsheets or clinical use.

What you’ll see when the calculator is embedded in WordPress

The calculator is designed to sit inside a standard WordPress content column (max width ~760px) with a white background for clean integration and fast rendering. It uses Plotly.js (lightweight CDN) to create a responsive chart that resizes with the page.

How to convert — step-by-step

1. Choose your input mode

Use the dropdown to select whether you’re entering kilograms, pounds, stones+ pounds, or stones (decimal). The appropriate inputs appear automatically.

2. Enter your measurement

Type the numeric value:

• For kg: use decimals (e.g. 70.0)
• For lbs: use decimals (e.g. 154.3)
• For stones + pounds: fill both boxes (e.g. 11 st and 4.5 lb)
• For stones (decimal): type a decimal (e.g. 11.32)

The calculator uses the industry-standard conversions: 1 stone = 14 lb and 1 stone ≈ 6.35029318 kg. These conversion constants align with measurement references and widely used clinical charts. Metric Conversions+1

3. Convert

Click Convert (or press Ctrl+Enter) to see a quick, readable result: kilograms, pounds, stones (decimal), and stones + pounds breakdown.

4. Save to history (optional)

Click Save to history to record the timestamped weight in your browser. The chart updates instantly. Your data remains on your device (stored in localStorage) unless you clear the history.

5. Export or clear

Export history as CSV for backup or to share with a healthcare provider. Use Clear history to remove all saved entries.

Interpreting the chart

The Plotly chart shows date on the X-axis and kilograms on the Y-axis. Hover to see the exact value and timestamp. Plotly provides pan and zoom; it’s interactive and mobile-friendly.

Useful external references

• Britannica — Stone (unit) overview. Encyclopedia Britannica
• NHS weight & unit conversion charts (examples). UHS Sussex+1

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FAQ

Q1: What exactly is a stone?
A: A stone (abbrev. st) is a traditional Imperial/British unit equal to 14 pounds (about 6.35029 kg). It’s still commonly used in the UK and Ireland to express body weight. Encyclopedia Britannica+1

Q2: Are conversions exact?
A: The conversion factor 1 st = 6.35029318 kg is a defined relationship derived from 1 lb = 0.45359237 kg and 14 lb per stone. For everyday use, rounding to 6.35029 kg is sufficient. Metric Conversions

Q3: Where is my saved history stored?
A: Saved entries are stored locally in your browser’s localStorage on that device and browser only. They don’t leave your device unless you export and share them.

Q4: Can I use this for clinical or medication dosing?
A: The tool is for conversion and simple tracking. For clinical dosing or medical decisions, always consult a healthcare professional and use validated clinical tools and records.

Q5: How do I make the calculator match my theme’s width?
A: The embed uses max-width:760px and width:100%. Adjust the max-width value in the style block to match your theme’s content width (e.g., 680px or 900px).

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