Percentage calculator template

Free build guide: Percentage calculator for WordPress

This guide rebuilds the Percentage calculator from this site in Gravity Forms: 7 inputs, 4 live results and no submit button. Expect about 33 minutes by hand. The template above is the same form as an import file, and the bundle adds a PDF version of this guide with a screenshot of every setting, plus the stylesheet.

You will end up with:

• Result
• Percent (%)
• Percent change (%)
• Difference

What you need

• Gravity Forms (any license) — Calculation fields and conditional logic are in core.

Everything here is core Gravity Forms. No add-ons.

1. Create the form

1. Go to Forms → New Form and name it Percentage.
2. In Form Settings → Form Layout, set the CSS Class Name to fo-live-only. Step 3 uses it to hide the submit button.
3. Leave the form open in the editor; the fields come next.

2. Add the fields, in this order

Field IDs are assigned as you add fields. If yours come out differently, change the {Label:ID} references in the formulas to match your IDs. Settings not mentioned stay at their defaults.

1. Find · Radio Buttons · ID 1
Custom CSS Class (Appearance tab) fo-segmented.

Choices (tick show values and enter each value):

• % of a number — value of (selected by default)
• X is what % of Y — value is
• % change — value change

2. Percent (%) · Number · ID 2
Number Format 9,999.99; Default Value 20; Layout: half width, on the same row as its neighbour (drag the field beside it in the editor; no CSS class needed); Conditional Logic (Advanced tab): Show this field if Find is % of a number..

3. Of · Number · ID 3
Number Format 9,999.99; Default Value 150; Layout: half width, on the same row as its neighbour (drag the field beside it in the editor; no CSS class needed); Conditional Logic (Advanced tab): Show this field if Find is % of a number..

4. Result · Number · ID 4
Number Format 9,999.99; Custom CSS Class (Appearance tab) fo-result; tick Enable Calculation, Rounding 2; Conditional Logic (Advanced tab): Show this field if Find is % of a number..

{Percent:2} * {Of:3} / 100

5. Number · Number · ID 5
Number Format 9,999.99; Default Value 30; Layout: half width, on the same row as its neighbour (drag the field beside it in the editor; no CSS class needed); Conditional Logic (Advanced tab): Show this field if Find is X is what % of Y..

6. Is what percent of · Number · ID 6
Number Format 9,999.99; Default Value 150; Layout: half width, on the same row as its neighbour (drag the field beside it in the editor; no CSS class needed); Conditional Logic (Advanced tab): Show this field if Find is X is what % of Y..

7. Percent (%) · Number · ID 7
Number Format 9,999.99; Custom CSS Class (Appearance tab) fo-result; tick Enable Calculation, Rounding 2; Conditional Logic (Advanced tab): Show this field if Find is X is what % of Y..

{Number:5} / {Is what percent of:6} * 100

8. From · Number · ID 8
Number Format 9,999.99; Default Value 100; Layout: half width, on the same row as its neighbour (drag the field beside it in the editor; no CSS class needed); Conditional Logic (Advanced tab): Show this field if Find is % change..

9. To · Number · ID 9
Number Format 9,999.99; Default Value 125; Layout: half width, on the same row as its neighbour (drag the field beside it in the editor; no CSS class needed); Conditional Logic (Advanced tab): Show this field if Find is % change..

10. Percent change (%) · Number · ID 10
Number Format 9,999.99; Description “Negative means a decrease.”; Custom CSS Class (Appearance tab) fo-result; tick Enable Calculation, Rounding 2; Conditional Logic (Advanced tab): Show this field if Find is % change..

( {To:9} - {From:8} ) / {From:8} * 100

11. Difference · Number · ID 11
Number Format 9,999.99; Custom CSS Class (Appearance tab) fo-result fo-result--sub; tick Enable Calculation, Rounding 2; Conditional Logic (Advanced tab): Show this field if Find is % change..

{To:9} - {From:8}

3. Hide the submit button

The results are live, so nothing needs submitting. Add this filter to your theme’s functions.php or a code-snippets plugin; it hides the button on any form carrying the fo-live-only class:

add_filter( 'gform_submit_button', function ( $button, $form ) {
	return str_contains( (string) rgar( $form, 'cssClass' ), 'fo-live-only' ) ? '' : $button;
}, 10, 2 );

Or with CSS alone: .fo-live-only_wrapper .gform_footer { display: none; }

4. Put it on a page and make it look like this

Add the form to any page with the Gravity Forms block, or the shortcode [gravityform id="X" title="false" ajax="false"]. The form inherits your theme’s styles; the classes you set in step 2 are hooks for the look you see on this site:

• fo-result on a calculation field makes it the big teal result panel.
• fo-result fo-result--sub makes the smaller secondary figures.
• fo-segmented on a radio field turns it into a segmented switch.
• Two fields on one row is the editor’s own column layout: drag a field beside another and the row splits in half. No CSS class is needed, and the old gf_left_half Ready Classes are deprecated.

The bundle includes the two stylesheets that implement those classes, with notes on matching your brand colours. Without them the form still works; it just looks like your theme’s default Gravity Forms styling.

How the maths works is explained under “How it’s calculated” on the live Percentage calculator.