Try the Rand Cost Averaging Calculator Widget
Free for any site, including commercial ones. Keep the small credit line at the bottom of the widget so readers can find the full version. Nothing is stored about the people who use it. See the disclaimer.
How to add it to your site
- Copy the code Use the copy button in the Embed code box so nothing is lost to line wrapping. It is a single iframe tag and it does not need anything else.
- Open the page you want it on In WordPress add a Custom HTML block, in Wix use the Embed HTML element, in Squarespace use a Code block, and on a hand-built site paste it straight into your HTML.
- Paste and publish The widget appears immediately. If you see an empty space instead, your editor has stripped the iframe tag, which the HTML embed guide explains how to work around.
- Adjust the look if you want to Add the parameters in the table below to the iframe URL to change the theme, the accent colour or the height. Nothing needs to be configured on our side.
Customisation options
| Parameter | Values | What it does |
|---|---|---|
theme | auto, light, dark | Default follows the reader's own system setting, so the widget looks right on a dark site and a light one without you choosing. |
accent | Six hex digits, e.g. accent=1A56DB | Recolours the header bar and the primary button to match your brand. |
header | 1 or 0 | Set to 0 to hide the title bar when your page already has a heading above the widget. |
breakdown | 1 or 0 | Set to 0 to hide the calculation breakdown for a more compact block. |
corners | 1 or 0 | Set to 0 for square corners if your design has no rounding anywhere else. |
width | full | Removes the 520px maximum so the widget stretches to its container. |
Parameters are added to the iframe URL as a normal query string, for example
/embed/rand-cost-averaging-calculator.html?theme=dark&accent=1A56DB&header=0. The
widget builder lets you set all of them visually and hands you the finished code.
Why embed the Rand Cost Averaging Calculator
Lump sum or monthly contributions is a question every South African investor asks at some point. The widget compares both over a price path the reader enters and shows the average price paid and the end value under each approach. Unit trust, ETF and tax-free savings content can give readers a worked answer.
What the widget calculates
Rand cost averaging means contributing a fixed amount at regular intervals rather than investing everything at once. The fixed rand amount buys more units when prices are low and fewer when they are high, which lowers the average cost paid.
It is not a way to earn a higher return. On average, over long periods, a lump sum invested earlier outperforms because it is exposed for longer. What averaging buys is a smaller worst case and a plan that survives a falling market.
The embedded version keeps the inputs and the result. The full Rand Cost Averaging Calculator on TradeAnswers adds worked examples, the method behind the numbers and a long FAQ.
Who this widget suits
Investing and portfolio blogs
Readers can test an allocation or a risk measure on the page instead of in a spreadsheet.
Finance courses and study sites
A live calculation under the explanation makes the concept concrete.
Advisory and planning sites
A clean, unbranded tool that fits inside an article without pulling readers away.
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The full library of free trading widgets has more than a hundred tools, and the widget builder lets you preview and configure any of them before you copy the code.