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Methodology

Unpaid Internship Cost methodology

Estimate an unpaid internship opportunity cost without making a legal determination.
Duc Nguyen X.By Duc Nguyen X.· Founder, Wage101Last reviewed: View update historyMethodology

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

Total economic cost
totalEconomicCost = weeklyHours × weeks × alternativeHourlyPay + directCosts − stipends

Where

weeklyHours
Weekly internship hours (hours/week)Source: User assumption
weeks
Internship weeks (weeks)Source: User assumption
alternativeHourlyPay
Alternative hourly pay (currency units/hour)Source: User assumption
directCosts
Direct costs (currency units)Source: User assumption
stipends
Stipends (currency units)Source: User assumption
totalEconomicCost
Total economic cost (currency units)Source: Calculated output
Foregone pay
foregonePay = weeklyHours × weeks × alternativeHourlyPay

Where

weeklyHours
Weekly internship hours (hours/week)Source: User assumption
weeks
Internship weeks (weeks)Source: User assumption
alternativeHourlyPay
Alternative hourly pay (currency units/hour)Source: User assumption
foregonePay
Foregone pay (currency units)Source: Calculated output
Economic cost per committed hour
economicCostPerHour = totalEconomicCost ÷ committedHours

Where

economicCostPerHour
Economic cost per committed hour (currency units/hour)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

20 hours for 12 weeks at 15 alternative hourly pay plus 1,200 direct costs.

Calculation and outputs

Example

20 hours for 12 weeks at 15 alternative hourly pay plus 1,200 direct costs.

Total economic cost
4,800.00 currency units
Foregone pay
3,600.00 currency units
Economic cost per committed hour
20.00 currency units

The engine returns 240 committed hours, 3,600 foregone pay and 4,800 total cost.

Interpretation

Use total economic cost as an opportunity-cost scenario, not a legal conclusion.

3. Validation and boundary checks

  • The worked example is calculated through the same shared-work-logic engine as the planner.
  • Non-finite and out-of-range assumptions return an input error.
  • Result cards, trace, CSV, PDF and methodology bind to named engine result fields.

4. Assumptions and source classification

  • Alternative pay and all direct costs are user assumptions.
  • Stipends directly offset entered costs.

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

  • The tool does not decide whether an internship is lawful.
  • Learning, networking and future outcomes are not monetized.

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

  1. : Initial public release of the Unpaid Internship Cost planner and methodology.

Related reading

Use these practical guides to interpret the decision and its assumptions.

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