Free UK work calculators

Understand your pay, time and working pattern.

Calculate overtime and shift premiums, compare jobs and commuting, plan rotating-shift leave and test different working patterns using your own figures.

Calculate overtime pay Browse all 17 tools

Example scenarioOvertime value at a glance

Gross pay

Base rate£15/hr

6h at 1.5×£135

Premium extra£45

Illustrative gross-pay example. Your contractual rate controls the real result.

Inputs stay in your browserNo account requiredTransparent formulasUK-focused wording

Calculator areas

Start with the decision you need to make

Focused calculator groups make it easier to move between closely related work questions.

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Pay & overtime

Overtime rates, shift premiums, gross extra pay and whether an extra shift is worth the time and costs.

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Shift & leave

Rotating-rota hours and leave planning for 4-on-4-off, 2-2-3 and custom work patterns.

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4d

Hours & patterns

Compare four-day weeks, compressed hours, annual hours and holiday packages.

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Jobs & commute

Compare jobs, pay rises, commuting, hybrid work and the cost of an extra working day.

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All calculators

17 practical work decision tools

Use your own figures and change assumptions until the comparison reflects your situation.

Pay & overtimeNEW

Overtime Pay Calculator

Calculate gross overtime at 1×, 1.25×, 1.5×, 2× or a custom rate, with weekly and annual projections.

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Shift & leave02

Shift Worker Annual Leave Optimiser

Anchor a rotating rota to a known date and find leave shifts that create the longest continuous breaks.

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Jobs & commute03

Pay Rise vs Extra Commute

See whether a higher salary is still worthwhile after extra travel cost and commuting time.

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Hours & patternsNEW

Work Pattern Comparator

Compare annual workdays, hours, commuting cost and total committed time across two patterns.

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Hours & patterns04

4-Day vs 5-Day Week

Compare the value of pay given up against days and hours gained from a shorter working week.

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Hours & patterns05

Compressed vs Reduced Hours

Compare keeping the same weekly hours over fewer days with actually reducing paid hours.

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Pay & overtime06

Overtime Break-Even

Work out whether an overtime shift is worthwhile after travel, childcare, food and extra time.

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Pay & overtime07

Shift Premium & Allowance

Turn a night, weekend or unsocial-hours premium into per-shift, monthly and annual extra pay.

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Jobs & commute08

Job A vs Job B Total Value Comparator

Compare two jobs after commute time, unpaid overtime, pension value and recurring work costs.

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Jobs & commute09

Extra Workday vs Childcare

See how much an extra working day actually adds after childcare and travel costs.

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Jobs & commute10

Hybrid Work Break-Even

Calculate what extra salary would compensate for additional office days, commuting and time.

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Shift & leave11

Annual Shift Hours Calculator

Estimate yearly hours, shifts and average weekly hours for repeating work/rest rotations.

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Hours & patterns12

Holiday Hours Value

Compare holiday packages in hours and paid value when jobs use different working-day lengths.

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Shift & leave13

4-on-4-off Leave Planner

Find efficient annual-leave dates on a repeating 4-on, 4-off rota.

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Shift & leave14

2 Days / 2 Nights / 4 Off Planner

Plan annual leave around a common two-day, two-night, four-off rotation.

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Shift & leave15

2-2-3 Shift Leave Planner

Find useful leave opportunities around a repeating 2-2-3 work pattern.

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Shift & leave16

Custom Rota Leave Optimiser

Enter your own repeating work/rest pattern and identify longer breaks from leave.

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Guides & reference

Go beyond the calculator result

Calculation-led guides show the arithmetic, worked scenarios and the assumptions worth checking before you use a result in a real decision.

Jobs

Compare two job offers beyond salary

Combine take-home pay, pension value, recurring costs and committed time.

Overtime

Calculate the true value of overtime

Separate total gross pay, the enhanced premium, incremental costs and time.

Shift rotas

Understand repeating rota arithmetic

See how 4-on-4-off, 2D/2N/4O and the defined 2-2-3 preset are modelled.

Browse all guides How calculations are checked

How it works

Use the numbers without pretending they make the decision

WorkDecisions turns your assumptions into comparable figures while leaving contractual, legal and personal judgement with you.

1 · Enter your figures

Use the pay rates, hours, costs and rota assumptions that actually apply to your situation.

2 · Compare the trade-off

Results translate the change into gross pay, time, annual value or effective hourly value.

3 · Check the source terms

Your contract, employer policy and official guidance take precedence over any planning estimate.

Why these calculators are different

Headline salary or an overtime multiplier rarely tells the whole story. WorkDecisions keeps the arithmetic visible and links closely related calculations together so you can compare extra pay with time, commuting, childcare and working patterns without creating an account.

The calculators are designed for general planning rather than payroll, tax, employment-rights or legal advice. Where contractual assumptions matter, the tool asks you to enter them instead of claiming a universal UK rate. The methodology page explains how formulas, annualisation and rota models are checked.