demo

Calculator with JavaScript support

Calculator Formula:

[field id="keywords"] * 0.15 * (jQuery("input[id^=\'form-field-plan-\']:checked").length * 0.5 + 0.5) * (1+parseInt([field id="plan"]))
* this count checked chechboxes, change the field Custom ID
* this is required only to trigger checkbox field, no impact on the total

#3186