Try the FX Options Calculator (Garman-Kohlhagen) 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/fx-options-garman-kohlhagen-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 FX Options Calculator (Garman-Kohlhagen)
Currency option prices are quoted as volatility, risk reversal and butterfly, which few free tools translate into a premium. The widget prices any FX option with Garman-Kohlhagen and builds the 25-delta smile.
What the widget calculates
An FX options calculator prices European currency options with the Garman-Kohlhagen model, using spot, strike, expiry, both interest rates and volatility.
Readers see the premium in pips and money, the Greeks, the forward rate and the 25-delta call and put strikes and volatilities implied by the risk reversal and butterfly.
The embedded version keeps the inputs and the result. The full FX Options Calculator (Garman-Kohlhagen) on TradeAnswers adds worked examples, the method behind the numbers and a long FAQ.
Who this widget suits
Trading education sites
Put it next to the lesson it illustrates so readers can try their own numbers before they move on.
Trading communities and forums
A shared tool gives members a common reference point when they discuss risk and drawdown.
Course and membership pages
Embed it in a module on account protection. It works inside most course platforms that allow a raw HTML block.
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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.