Hourly Wage Calculator Formula
Learn how weekly, monthly, annual, and overtime gross pay are calculated from an hourly wage and hours worked.
This page explains the math behind an hourly wage calculator. It shows how regular pay, overtime pay, weekly gross pay, monthly average pay, and annual gross pay are estimated from a few simple inputs.
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Total Weekly Gross Pay
Where:
First calculate regular weekly pay from your hourly rate and regular hours. Then calculate the overtime rate, multiply it by overtime hours, and add that amount to regular pay.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| hourlyRate - Hourly Rate | Standard gross pay earned for one hour of regular work. | currency |
| hoursPerWeek - Regular Hours per Week | Number of non-overtime hours usually worked each week. | hours |
| overtimeHoursPerWeek - Overtime Hours per Week | Number of weekly overtime hours paid at a different rate. | hours |
| overtimeMultiplier - Overtime Multiplier | Factor applied to the hourly rate for overtime pay, such as 1.5 or 2. | N/A |
| weeksPerYear - Working Weeks per Year | Number of weeks worked in a year for the annual estimate. | weeks |
Step-by-Step Calculation
Calculate regular weekly pay
Multiply the standard hourly rate by regular weekly hours to get gross pay from normal hours only.
regularWeeklyPay = hourlyRate * hoursPerWeek
Calculate the overtime hourly rate
Apply the overtime multiplier to the standard hourly rate.
overtimeRate = hourlyRate * overtimeMultiplier
Calculate overtime weekly pay
Multiply the overtime rate by overtime hours worked in a typical week.
overtimeWeeklyPay = overtimeRate * overtimeHoursPerWeek
Calculate total weekly pay
Add regular weekly pay and overtime weekly pay to estimate total gross pay for one week.
weeklyPay = regularWeeklyPay + overtimeWeeklyPay
Calculate annual pay
Multiply weekly gross pay by the number of working weeks in the year.
annualPay = weeklyPay * weeksPerYear
Calculate average monthly pay
Divide annual gross pay by 12 to estimate an average monthly amount.
monthlyPay = annualPay / 12
Example: $22 per hour with weekly overtime
Regular weekly pay
22 × 40
$880.00
Overtime rate
22 × 1.5
$33.00 per hour
Overtime weekly pay
33 × 6
$198.00
Total weekly pay
880 + 198
$1,078.00
Annual pay
1,078 × 50
$53,900.00
Average monthly pay
53,900 ÷ 12
$4,491.67
Final Result
Estimated gross pay is $1,078.00 per week, $4,491.67 per month on average, and $53,900.00 per year.
Assumptions
- ✓The hourly rate stays the same across all weeks included in the estimate.
- ✓Regular hours and overtime hours are assumed to be consistent from week to week.
- ✓Monthly pay is shown as annual pay divided by 12, so it represents an average month rather than an exact payroll month.
- ✓Overtime pay is calculated using the multiplier entered and does not include any extra shift premiums or special rules.
Limitations
- !Actual paychecks may differ because of taxes, retirement contributions, insurance, or other deductions.
- !Some employers calculate overtime using daily rules, blended rates, or thresholds not captured by a simple weekly model.
- !Unpaid breaks, bonuses, commissions, tips, and holiday pay are not included unless added separately outside the calculator.
- !If your hours vary significantly each week, the estimate may not match actual monthly or annual earnings closely.
Common Mistakes to Avoid
Entering total hours in regular hours and then entering the same extra hours again as overtime.
Using 52 weeks per year when you expect unpaid leave or time off.
Forgetting that the result is gross pay before deductions.
Using the wrong overtime multiplier, such as 1 instead of 1.5.
Assuming the monthly figure matches every paycheck month exactly.
Related Formulas
Frequently Asked Questions
What is the formula for hourly wage to weekly pay?
Weekly gross pay is regular weekly pay plus overtime weekly pay. That is calculated as (hourly rate × regular hours) + ((hourly rate × overtime multiplier) × overtime hours).
How do you convert hourly pay to annual salary?
Estimate weekly pay first, then multiply by working weeks per year. If there is no overtime, annual pay is hourly rate × hours per week × weeks per year.
Why is monthly pay divided by 12?
The calculator estimates average monthly pay by spreading annual earnings evenly over 12 months. This helps compare monthly income, but actual payroll months can differ.
How is overtime pay calculated in this formula?
The calculator multiplies the standard hourly rate by the overtime multiplier to get the overtime rate, then multiplies that by overtime hours per week.
Can I use the formula if I work different hours each week?
Yes, but the result is only an estimate. If your schedule changes often, using average weekly hours usually gives a more realistic yearly figure.
Ready to calculate your result?
Use the calculator to get instant results with your own inputs.