The practical approach
Start by putting both offers on the same time basis: annual gross with bonuses separated from guaranteed pay. Then estimate taxes and mandatory payroll deductions in each jurisdiction.
Next compare housing, commuting, health costs, childcare or school costs where relevant, and recurring household expenses. Treat one-off relocation benefits separately.
Finally compare the disposable amount left after essential costs. This makes trade-offs visible without pretending that one salary number captures quality of life.
Related questions
Why not just convert the salary using an exchange rate?
Exchange rates convert currencies; they do not account for taxes, housing or household spending.
Should the result be treated as exact?
No. Relocation calculations are planning estimates. Personal tax circumstances and spending choices can materially change the outcome.