How to Use the Compressed Workweek Calculator

Overview

What Does the Compressed Workweek Calculator Do?

The WorkersPool Compressed Workweek Calculator models what any compressed work arrangement would look like in practice — showing daily hours, days off gained per year, overtime implications, pay impact and an annual comparison between your current and proposed schedules. You enter your current schedule and proposed compressed arrangement, and the tool calculates the full picture side by side.

Four schedule types are pre-configured: 4×10 (4 days, 10 hrs/day), 9/80 (9-day fortnight with an alternating day off), 4.5×9 (4.5 days, 9 hrs/day with a half-day Friday), and Custom (where you define your own parameters). The tool is useful for both employees building a proposal and managers evaluating a request.

Schedule Types

Which Schedule Type Should I Model?

Type	Structure	Days Off Gained	Best For
4 × 10	4 days/week, 10 hrs/day, same total weekly hours	52 extra days/year	Knowledge workers, remote roles, project-based work
9/80	80 hrs in 9 days over 2 weeks; 1 day off every fortnight	26 extra days/year	Government, engineering, roles requiring some 5-day coverage
4.5 × 9	4 full days + 1 half day, 9 hrs on full days	26 half-days/year	Client-facing roles where full Friday absence is harder to justify
Custom	You set days per week and hours per day	Calculated	Any non-standard arrangement

Instructions

Step-by-Step Instructions

Select your schedule typeChoose the arrangement you want to model. If your arrangement does not match a preset, use Custom and enter your own days per week and hours per day.
Enter your current scheduleSelect your current days per week (5 or 6) and hours per day. Enter your hourly rate if you want pay calculations — leave blank for hours-only comparison.
Configure the compressed scheduleThe preset schedule type auto-fills the compressed days and hours fields. For Custom, enter your proposed days per week and hours per work day manually.
Set overtime parametersEnter your overtime threshold (hours per week) and your overtime multiplier. This is important — in some provinces, longer daily hours trigger daily overtime even if weekly totals are the same (see the overtime section below).
Enter annual contextWeeks worked per year (default 50) and optionally your annual salary. These are used for the annual comparison panel.
Review all output panelsThe summary cards show Days Off Gained, Overtime Hours/Week, Hours/Day and Pay Change at a glance. The Week at a Glance panel shows the visual difference between your current and compressed weeks. The Annual Comparison shows the full-year impact.
Print or copy the reportUse Copy Results or Print Report to save the output. The print version is suitable for attaching to a formal flexible working request.

Overtime Warning

The Overtime Trap — Know Before You Agree

This is the most critical thing to understand before agreeing to a compressed schedule — particularly a 4×10 arrangement:

Province	Weekly OT Threshold	Daily OT Threshold	4×10 Daily OT Risk?
Ontario	44 hrs/week	None	No — 40 hrs/week is under threshold
BC	40 hrs/week	After 8 hrs/day (1.5x) + after 12 hrs (2.0x)	Yes — 10-hr days exceed 8-hr daily threshold
Alberta	44 hrs/week	None	No — 40 hrs/week is under threshold
Quebec	40 hrs/week	None	Borderline — 40 hrs exactly, no buffer

If you are in BC and agree to a 4×10 schedule without overtime, you may be waiving your legal entitlement to overtime pay for the extra 2 hours each day. This requires a formal averaging agreement under BC's Employment Standards Act. Always check your provincial rules before agreeing.

Worked Example

Example: Leila Models a 4×10 Request in Ontario

Inputs

Schedule Type4 × 10

Current Schedule5 days/week, 8 hrs/day

Hourly Rate$34.00

OT Threshold44 hrs (Ontario)

Annual Salary$70,720

Results

Days Off Gained52 days per year (every Friday)

OT Hours/Week0 — 40 hrs is under Ontario's 44-hr threshold

Hours/Day (compressed)10 hours

Annual Hours2,000 hrs (same as current)

Pay Change$0 — same total hours, same pay

Commute Saving52 fewer commute days — use Commute Cost Calculator

Leila uses the printed report as an attachment to a formal Flexible Working Request letter (generated with the Flexible Working Request tool). She includes the commute cost saving calculated separately, frames the request as a 3-month trial, and proposes a colleague coverage arrangement for Fridays. Her manager approves the trial.

Disclaimer

Important Disclaimer

The Compressed Workweek Calculator provides estimates for informational and planning purposes only. Actual pay impact, overtime entitlements and schedule feasibility depend on your employment agreement, provincial Employment Standards Act, collective agreement and employer policy. The calculator does not constitute legal or HR advice. Always verify overtime implications with your provincial Employment Standards Act and consult your HR department before implementing any schedule change. WorkersPool accepts no liability for employment or financial decisions based on this tool's output.

FAQ

Frequently Asked Questions

What is the difference between a 4-day week and a compressed workweek?

A true 4-day week (as advocated by 4 Day Week Global) involves doing the same amount of work in 4 days that you previously did in 5 — at the same pay. This assumes a productivity improvement, not just the same hours in fewer days. A compressed workweek means working the same total hours (e.g. 40 hrs) across 4 days (4×10). Both give you an extra day off but the true 4-day week does not require longer daily hours. This calculator models compressed schedules — the same or similar total hours in fewer days.

What is a 9/80 schedule exactly?

A 9/80 schedule distributes 80 hours across 9 days over a 2-week period. In Week 1: 9 hrs/day Monday–Thursday, 8 hrs on Friday. In Week 2: 9 hrs/day Monday–Thursday, Friday off. Total: 80 hours over 2 weeks — identical to a standard 2-week schedule. You get one full day off every two weeks (typically alternating Fridays). It is popular in government and engineering where 5-day coverage is needed some weeks but not every week.

Can my employer refuse a compressed workweek request?

In most cases yes — unless a collective agreement or employment contract specifies otherwise, your employer has the right to set your work schedule. Under certain human rights grounds (religious observance, disability accommodation) you may have stronger grounds. The most effective path is making a strong business case — productivity evidence, a coverage proposal, a trial period offer — rather than asserting a right. The Flexible Working Request tool generates a formal letter for exactly this purpose.

How does a compressed workweek affect benefits?

Most benefits — health, dental, pension, vacation — are based on annual salary or insured earnings rather than daily hours worked, so they are typically unaffected by a compressed schedule at the same annual hours. However, some benefits (particularly life insurance or disability insurance calculated on weekly earnings) may differ. Always confirm with your HR department before agreeing to any schedule change.

Should I get the arrangement in writing?

Yes — always. A verbal agreement to work a compressed schedule has limited enforceability and is vulnerable to management changes, organisational restructuring or simply being forgotten. Get the arrangement documented in an amended employment agreement, a letter of understanding or a formal schedule change form. This protects you if circumstances change and prevents gradual scope creep back toward a standard schedule without discussion.

Proposal Checklist

Before You Make the Request

✅ Modelled the schedule with this calculator — know your exact daily hours and any OT risk
✅ Checked your provincial overtime rules for daily thresholds
✅ Have 3–6 months of strong performance data to cite
✅ Proposed a coverage plan for your compressed day off
✅ Offering a 3-month trial with clear success metrics
✅ Have a written request — use the Flexible Working Request tool
✅ Know your overtime position before agreeing to anything

Compressed Workweek Calculator — Help Guide