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    <p>I would add a couple of computed observables in there to do the parsing:</p> <pre><code> var viewModel = { num1: ko.observable(0), num2: ko.observable(0) }; viewModel.num1Parsed = ko.computed(function () { return viewModel.num1().replaceAll(',', '.'); }, viewModel); viewModel.num2Parsed = ko.computed(function () { return viewModel.num2().replaceAll(',', '.'); }, viewModel); viewModel.total = ko.computed(function () { return parseFloat(viewModel.num1Parsed()) + parseFloat(viewModel.num2Parsed()); }, viewModel); </code></pre> <p>I use the following function for replaceAll:</p> <pre><code>/** * ReplaceAll by Fagner Brack (MIT Licensed) * Replaces all occurrences of a substring in a string */ String.prototype.replaceAll = function (token, newToken, ignoreCase) { var str, i = -1, _token; if ((str = this.toString()) &amp;&amp; typeof token === "string") { _token = ignoreCase === true ? token.toLowerCase() : undefined; while ((i = ( _token !== undefined ? str.toLowerCase().indexOf( _token, i &gt;= 0 ? i + newToken.length : 0 ) : str.indexOf( token, i &gt;= 0 ? i + newToken.length : 0 ) )) !== -1) { str = str.substring(0, i) .concat(newToken) .concat(str.substring(i + token.length)); } } return str; }; </code></pre> <p>Alternatively, you could just replace your num1 and num2 observables in the HTML with a computed that parses as the value is written to it:</p> <pre><code> this.num1Parsed = ko.dependentObservable({ read: function () { return viewModel.num1(); }, write: function (value) { viewModel.num1(value.replaceAll(',', '.')); }, owner: this }); this.num2Parsed = ko.dependentObservable({ read: function () { return viewModel.num2(); }, write: function (value) { viewModel.num2(value.replaceAll(',', '.')); }, owner: this }); </code></pre> <p>.. and then change your HTML to:</p> <pre><code>&lt;input type="text" data-bind="value: num1Parsed, valueUpdate: 'keyup'"/&gt; &lt;input type="text" data-bind="value: num2Parsed, valueUpdate: 'keyup'"/&gt; &lt;input type="text" data-bind="value: total"/&gt; </code></pre>
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