Coffee brew ratio calculator template

Free build guide: Coffee brew ratio calculator for WordPress

This guide rebuilds the Coffee brew ratio calculator from this site in Gravity Forms: 4 inputs, 4 live results and no submit button. Expect about 24 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:

• Coffee (g)
• Water (ml)
• Cups (8 oz)
• Tablespoons of beans (approx.)

What you need

• Gravity Forms (any license) — Calculation fields, drop-down values, radio values 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 Coffee brew ratio.
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. Brew method · Drop Down · ID 1

Choices (tick show values and enter each value):

• Pour-over (1:16) — value 16 (selected by default)
• Drip machine (1:17) — value 17
• French press (1:15) — value 15
• AeroPress (1:14) — value 14
• Chemex, strong (1:12) — value 12
• Moka pot (1:10) — value 10
• Cold brew concentrate (1:5) — value 5
• Cold brew, ready to drink (1:8) — value 8
• Espresso (1:2) — value 2

2. I know the · Radio Buttons · ID 2
Custom CSS Class (Appearance tab) fo-segmented.

Choices (tick show values and enter each value):

• Water — value 1 (selected by default)
• Coffee — value 0

3. Water (ml or g) · Number · ID 3
Number Format 9,999.99; Default Value 500; Description “A mug is about 300 ml; a standard cup 237 ml.”; Conditional Logic (Advanced tab): Show this field if I know the is Water..

4. Coffee (g) · Number · ID 4
Number Format 9,999.99; Default Value 30; Conditional Logic (Advanced tab): Show this field if I know the is Coffee..

5. Coffee (g) · Number · ID 5
Number Format 9,999.99; Description “Weigh it; scoops vary with the grind and the roast.”; Custom CSS Class (Appearance tab) fo-result; tick Enable Calculation, Rounding 1.

( {Mode:2} * ( {Water:3} / {Ratio:1} ) + ( 1 - {Mode:2} ) * {Coffee:4} )

6. Water (ml) · Number · ID 6
Number Format 9,999.99; Layout: half width, on the same row as its neighbour (drag the field beside it in the editor; no CSS class needed); Custom CSS Class (Appearance tab) fo-result fo-result--sub; tick Enable Calculation, Rounding 0.

( {Mode:2} * {Water:3} + ( 1 - {Mode:2} ) * {Coffee:4} * {Ratio:1} )

7. Cups (8 oz) · Number · ID 7
Number Format 9,999.99; Layout: half width, on the same row as its neighbour (drag the field beside it in the editor; no CSS class needed); Custom CSS Class (Appearance tab) fo-result fo-result--sub; tick Enable Calculation, Rounding 1.

( {Mode:2} * {Water:3} + ( 1 - {Mode:2} ) * {Coffee:4} * {Ratio:1} ) / 237

8. Tablespoons of beans (approx.) · Number · ID 8
Number Format 9,999.99; Description “If you have no scale: a level tablespoon of whole beans is about 5–6 g.”; Custom CSS Class (Appearance tab) fo-result fo-result--sub; tick Enable Calculation, Rounding 1.

( {Mode:2} * ( {Water:3} / {Ratio:1} ) + ( 1 - {Mode:2} ) * {Coffee:4} ) / 5.5

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 Coffee brew ratio calculator.