Sleep cycle calculator template

Free build guide: Sleep cycle calculator for WordPress

This guide rebuilds the Sleep cycle calculator from this site in Gravity Forms: 4 inputs, 8 live results and no submit button. Expect about 36 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:

• 6 cycles (9 h): hour
• minute
• 5 cycles (7 h 30): hour
• minute
• 4 cycles (6 h): hour
• minute
• 3 cycles (4 h 30): hour
• minute

What you need

• Gravity Forms (any license) — Calculation fields and radio values are in core; floor() and the modulo need GP Advanced Calculations.
• GP Advanced Calculations (Gravity Wiz) — Exponents, functions and date math in calculation fields. The formulas in this template use its syntax. Part of Gravity Perks; needs the Spellbook plugin active as well.

The formulas below use GP Advanced Calculations syntax: exponents, functions or date math that core calculation fields cannot do. Install and activate it, with its Spellbook parent plugin, before you start; without it every result shows 0.

1. Create the form

1. Go to Forms → New Form and name it Sleep cycle.
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. I know my · Radio Buttons · ID 1
Custom CSS Class (Appearance tab) fo-segmented.

Choices (tick show values and enter each value):

• Wake-up time — value 1 (selected by default)
• Bedtime — value 0

2. Hour (0–23) · Number · ID 2
Number Format 9,999.99; Default Value 6; Description “24-hour clock: 6 for 6 am, 22 for 10 pm.”; Layout: half width, on the same row as its neighbor (drag the field beside it in the editor; no CSS class needed).

3. Minute · Number · ID 3
Number Format 9,999.99; Default Value 30; Layout: half width, on the same row as its neighbor (drag the field beside it in the editor; no CSS class needed).

4. Minutes to fall asleep · Number · ID 4
Number Format 9,999.99; Default Value 15; Description “Most people take 10–20.”.

5. 6 cycles (9 h): hour · Number · ID 5
Number Format 9,999.99; Description “Bedtime for a full night, 24-hour clock. If you know your bedtime, this is the wake-up time instead.”; Layout: half width, on the same row as its neighbor (drag the field beside it in the editor; no CSS class needed); Custom CSS Class (Appearance tab) fo-result; tick Enable Calculation, Rounding 0.

floor( ( ( ( ( {Hour:2} * 60 + {Minute:3} ) + ( 1 - 2 * {Mode:1} ) * ( 6 * 90 + {Fall asleep:4} ) + 2880 ) % 1440 ) / 60 ) )

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

( ( ( {Hour:2} * 60 + {Minute:3} ) + ( 1 - 2 * {Mode:1} ) * ( 6 * 90 + {Fall asleep:4} ) + 2880 ) % 1440 ) % 60

7. 5 cycles (7 h 30): hour · Number · ID 7
Number Format 9,999.99; Description “The usual adult night.”; Layout: half width, on the same row as its neighbor (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.

floor( ( ( ( ( {Hour:2} * 60 + {Minute:3} ) + ( 1 - 2 * {Mode:1} ) * ( 5 * 90 + {Fall asleep:4} ) + 2880 ) % 1440 ) / 60 ) )

8. minute · Number · ID 8
Number Format 9,999.99; Layout: half width, on the same row as its neighbor (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.

( ( ( {Hour:2} * 60 + {Minute:3} ) + ( 1 - 2 * {Mode:1} ) * ( 5 * 90 + {Fall asleep:4} ) + 2880 ) % 1440 ) % 60

9. 4 cycles (6 h): hour · Number · ID 9
Number Format 9,999.99; Description “A short night that still ends between cycles.”; Layout: half width, on the same row as its neighbor (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.

floor( ( ( ( ( {Hour:2} * 60 + {Minute:3} ) + ( 1 - 2 * {Mode:1} ) * ( 4 * 90 + {Fall asleep:4} ) + 2880 ) % 1440 ) / 60 ) )

10. minute · Number · ID 10
Number Format 9,999.99; Layout: half width, on the same row as its neighbor (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.

( ( ( {Hour:2} * 60 + {Minute:3} ) + ( 1 - 2 * {Mode:1} ) * ( 4 * 90 + {Fall asleep:4} ) + 2880 ) % 1440 ) % 60

11. 3 cycles (4 h 30): hour · Number · ID 11
Number Format 9,999.99; Description “Emergency only.”; Layout: half width, on the same row as its neighbor (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.

floor( ( ( ( ( {Hour:2} * 60 + {Minute:3} ) + ( 1 - 2 * {Mode:1} ) * ( 3 * 90 + {Fall asleep:4} ) + 2880 ) % 1440 ) / 60 ) )

12. minute · Number · ID 12
Number Format 9,999.99; Layout: half width, on the same row as its neighbor (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.

( ( ( {Hour:2} * 60 + {Minute:3} ) + ( 1 - 2 * {Mode:1} ) * ( 3 * 90 + {Fall asleep:4} ) + 2880 ) % 1440 ) % 60

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 colors. Without them the form still works; it just looks like your theme’s default Gravity Forms styling.

How the math works is explained under “How it’s calculated” on the live Sleep cycle calculator.