Income comes in several forms — hourly, weekly, monthly, and yearly — and at some point you will need to convert between them. Maybe you are comparing an hourly contract with a salaried offer, or working out what a monthly wage adds up to over a year. The math looks simple, but a few common assumptions can throw your numbers off.
This guide explains the standard formulas, the assumptions behind them, and the mistakes to avoid.
Common Income Pay Periods
Income is usually quoted in one of four ways:
- Hourly: an amount per hour worked, common for part-time, shift, and contract work.
- Weekly: a total paid each week, often for temporary roles.
- Monthly: common for salaried employees.
- Yearly: used in contracts and job offers.
Why Income Conversion Is Not Always Straightforward
The assumption that hourly rate times hours times weeks equals salary oversimplifies things. In practice:
- working hours fluctuate
- paid and unpaid time differ
- holidays and sick leave vary
- freelancers have inconsistent schedules
- conventions differ between countries
Standard Assumptions Used in Conversion
Unless stated otherwise, most calculators assume:
- 40 working hours per week
- 5 working days per week
- 52 weeks per year
- 12 months per year
These assumptions make conversions consistent, but your real situation may differ.
How to Convert Hourly Income to Yearly Salary
Multiply your hourly rate by hours per week, then by weeks per year:
- Hourly rate x hours per week x weeks per year = yearly salary
- Example: 25 per hour x 40 hours x 52 weeks = 52,000 per year
For a ready-made tool, use our hourly to salary converter, and for more worked examples see the hourly to salary conversion guide.
How to Convert Monthly Income to Yearly Salary
Multiply your monthly income by 12:
- Monthly income x 12 = yearly income
- Example: 4,000 per month x 12 = 48,000 per year
This assumes consistent monthly payments with no extra or missing months.
Weekly to Monthly and Yearly Conversions
Weekly pay, often used for temporary work, converts like this:
- Weekly x 52 = yearly
- Yearly divided by 12 = monthly
- Example: 1,000 per week = 52,000 per year, or about 4,333 per month
Hourly vs Salary: Which Is Better?
Neither format is universally better. Hourly work suits flexible arrangements and can reward extra hours, while a salary provides stability and predictable pay. The right choice depends on your priorities.
Common Income Conversion Mistakes
- overlooking unpaid holidays
- assuming exactly 52 working weeks for everyone
- ignoring part-time schedules
- confusing gross hourly pay with net salary
- leaving out taxes entirely
That last point matters most: a conversion gives you a gross figure, not your take-home pay.
How to Compare Job Offers With Different Pay Periods
Convert every offer to yearly gross income using identical assumptions, then estimate net income where you can, and finally weigh benefits and job stability. Our guide on how to compare job offers walks through the full process.
When to Focus on Net Income Instead
Gross conversions are useful, but net income matters more for real life. Tax systems, employment classification, and location all influence your actual take-home pay. To see the gap clearly, read gross income vs net income, then run your numbers through the salary calculator.
Final Thoughts
Income conversion is more than arithmetic. Working hours, unpaid periods, and scheduling differences all change the final figure, and taxes change it again. Use standard assumptions as a starting point, adjust them to your situation, and always check net pay before making a decision.