Methodology
Full-Time vs Part-Time Calculator methodology
Educational only: Work and pay decision support, not tax, legal, financial or career advice.
Privacy: Calculations run locally; Wage101 does not receive your work or pay inputs.
Update policy: Reviewed when formulas or official dependencies change.
Scope: Market-neutral work and pay planning using your own assumptions.
1. Formulas and units
hourlyDifference = partTimeEffectiveValue − fullTimeEffectiveValueWhere
- hourlyDifference
- Hourly Difference (currency units/hour)Source: Calculated output
- partTimeEffectiveValue
- Part Time Effective Value (currency units/year)Source: Calculated output
- fullTimeEffectiveValue
- Full Time Effective Value (currency units/year)Source: Calculated output
netAnnualValueDifference = secondNetAnnualWorkValue − firstNetAnnualWorkValueWhere
- netAnnualValueDifference
- Part-time annual value difference (currency units/year)Source: Calculated output
effectiveHourlyDifference = secondNetAnnualWorkValue ÷ secondAnnualCommittedHours − firstNetAnnualWorkValue ÷ firstAnnualCommittedHoursWhere
- effectiveHourlyDifference
- Part-time hourly value difference (currency units/hour)Source: Calculated output
requiredSecondBasePayToMatchFirstHourly = max(0, firstEffectiveHourlyValue × secondAnnualCommittedHours + secondAnnualDirectWorkCosts − secondAnnualVariablePay − secondAnnualBenefitsValue)Where
- secondAnnualVariablePay
- Part-time role annual variable pay (currency units/year)Source: User assumption
- secondAnnualBenefitsValue
- Part-time role annual benefits (currency units/year)Source: User assumption
- secondAnnualDirectWorkCosts
- Part-time role annual direct work costs (currency units/year)Source: User assumption
- requiredSecondBasePayToMatchFirstHourly
- Part-time base pay for hourly parity (currency units/year)Source: Calculated output
secondNetAnnualWorkValue = secondAnnualBasePay + secondAnnualVariablePay + secondAnnualBenefitsValue − secondAnnualDirectWorkCostsWhere
- secondAnnualBasePay
- Part-time role annual base pay (currency units/year)Source: Work record
- secondAnnualVariablePay
- Part-time role annual variable pay (currency units/year)Source: User assumption
- secondAnnualBenefitsValue
- Part-time role annual benefits (currency units/year)Source: User assumption
- secondAnnualDirectWorkCosts
- Part-time role annual direct work costs (currency units/year)Source: User assumption
- secondNetAnnualWorkValue
- Part-time net annual work value (currency units/year)Source: Calculated output
Money inputs and outputs use the currency selected in the scenario without changing the canonical methodology. Pay, time, benefits and work-related costs use the units stated beside each input.
2. Worked example
Input assumptions
Compare an 80,000 full-time role at 40 weekly hours with a 48,000 part-time role at 24 hours.
Calculation and outputs
Example
Compare an 80,000 full-time role at 40 weekly hours with a 48,000 part-time role at 24 hours.
- Part-time annual value difference
- -39,000.00 currency units
- Part-time hourly value difference
- -2.98 currency units
- Part-time base pay for hourly parity
- 51,894.44 currency units
- Part-time net annual work value
- 50,000.00 currency units
The annual-value trade-off stays separate from the committed-time hourly comparison.
Interpretation
Use the annual trade-off alongside effective hourly value and the actual schedule.
3. Validation and boundary checks
- Each schedule has positive paid hours and compensation.
- Benefits and costs remain independently entered.
- Committed hours include unpaid time and commuting.
4. Assumptions and source classification
- Both scenarios use user-entered gross values.
- Weeks and schedules represent typical years.
- No tax or local benefit eligibility is inferred.
This calculator has no current policy-data dependency. Its work and pay assumptions are user supplied. Registered family-level regression suites exercise the shared work-logic engine and worked-result reconciliation.
5. Limitations
- Career progression and schedule flexibility are not valued.
- Benefits may not scale linearly with hours.
- Local part-time protections are outside the calculation.
This is educational decision support, not personalised tax, legal, financial or career advice. Check the treatment of your circumstances under the rules that apply to you and seek qualified advice where appropriate.
6. Update and evidence policy
Registered family-level suites test formula invariants and example reconciliation; the release ledger records that coverage without claiming a separate oracle for every line of public copy. There is no official threshold or benchmark to refresh for this calculator. Work and pay inputs remain user-supplied because they vary by person, job and contract.
Change history
- : Initial public release of the Full-Time vs Part-Time planner and methodology.
Related reading
Use these practical guides to interpret the decision and its assumptions.
- How to compare full time vs part time decisions
Compare full-time and part-time scenarios without assuming hours, benefits or costs scale equally.
Read guide