Overtime Calculator
Quickly compute overtime with accurate formulas. See amortization schedules, growth projections, and side-by-side comparisons.
Overtime Calculator — Weekly & Annual Projections
Calculate weekly overtime earnings, effective hourly rate, and annual income projections. Enter your hourly rate and hours worked to see time-and-a-half pay with yearly totals.
Last updated: January 2026Reviewed by NovaCalculator Finance Editorial Team
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Regular pay is your base hourly rate times regular hours worked (typically 40/week). Overtime pay is calculated at your OT rate (base rate times the OT multiplier, usually 1.5x for time-and-a-half or 2x for double time) times overtime hours. The effective hourly rate equals total pay divided by total hours worked.
Last reviewed: January 2026
Worked Examples
Example 1: Standard Overtime Calculation
Example 2: California Double Time Scenario
Background & Theory
The Overtime Calculator — Weekly & Annual Projections applies the following established principles and formulas. Finance and investing rest on the foundational concept of the time value of money: a dollar received today is worth more than a dollar received in the future, because present funds can be deployed to earn a return. This principle underlies virtually every valuation technique in modern finance. The future value of a present sum P growing at rate r over n periods is expressed as FV = P(1 + r)^n, while the present value of a future cash flow FV is PV = FV / (1 + r)^n. Compound growth amplifies returns significantly over long horizons, a dynamic often described as the eighth wonder of the world. Net Present Value (NPV) extends these mechanics to evaluate investment projects by summing the present values of all expected cash flows minus the initial outlay: NPV = sum[CF_t / (1 + r)^t] - C_0. A positive NPV indicates the project creates value above the required return. The Internal Rate of Return (IRR) is the discount rate that sets NPV to zero, providing a single percentage benchmark for project comparison. The risk-return tradeoff is the central tension of investment theory. Higher expected returns generally require accepting greater uncertainty. Harry Markowitz formalized this in Modern Portfolio Theory by demonstrating that portfolio variance can be reduced through diversification when assets are imperfectly correlated. The efficient frontier represents the set of portfolios offering the maximum return for a given level of risk. The Capital Asset Pricing Model (CAPM) extends this by introducing the market portfolio as a reference, defining expected return as E(r) = r_f + beta * (E(r_m) - r_f), where beta measures an asset's sensitivity to systematic market risk. Asset classes — equities, fixed income, real assets, and alternatives — differ in their return profiles, liquidity, and correlations. Strategic asset allocation determines long-run target weights based on investor objectives and risk tolerance, while tactical allocation permits short-run deviations to exploit perceived mispricings. Discount rates used in valuation models must reflect the cost of capital appropriate to the risk of the cash flows being discounted, a point stressed in corporate finance texts from Brealey, Myers, and Allen through to Damodaran.
History
The history behind the Overtime Calculator — Weekly & Annual Projections traces back through the following developments. The formal practice of lending at interest dates to ancient Mesopotamia, where the Code of Hammurabi around 1750 BCE regulated interest rates on grain and silver loans. Banking as an institutional activity took root in medieval Italy, with merchant bankers in Florence and Venice financing trade across Europe through instruments such as bills of exchange. The Medici family operated one of the most sophisticated banking networks of the fifteenth century, pioneering double-entry bookkeeping and correspondent banking relationships. Organized equity markets emerged in the early seventeenth century. The Dutch East India Company (VOC), chartered in 1602, issued shares to the public and created the Amsterdam Stock Exchange — widely regarded as the world's first formal stock exchange. The VOC allowed investors to buy and sell shares freely, establishing the template for the joint-stock company. The period also produced the Dutch tulip mania of 1636 to 1637, one of history's first recorded speculative bubbles, in which tulip bulb futures contracts reached extraordinary prices before collapsing. England's financial revolution followed in the late seventeenth century with the founding of the Bank of England in 1694 and the development of government bond markets. The South Sea Bubble of 1720 illustrated the dangers of speculative excess and contributed to early securities regulation. Throughout the eighteenth and nineteenth centuries, industrialization created enormous demand for capital, fueling the expansion of stock exchanges in London, Paris, New York, and beyond. The New York Stock Exchange, formalized in 1817, became the world's dominant equities market by the twentieth century. The Great Crash of 1929 and subsequent Great Depression prompted the US Securities Act of 1933 and Securities Exchange Act of 1934, establishing the SEC and mandatory disclosure requirements. Harry Markowitz published his landmark portfolio selection paper in 1952, launching quantitative finance. The CAPM emerged in the 1960s through work by Sharpe, Lintner, and Mossin. John Bogle launched the first retail index fund in 1976, democratizing diversified investing and challenging active management orthodoxy.
Frequently Asked Questions
Sources & References
Formula
Total Pay = (Regular Rate × Regular Hours) + (Regular Rate × OT Multiplier × OT Hours)
Regular pay is your base hourly rate times regular hours worked (typically 40/week). Overtime pay is calculated at your OT rate (base rate times the OT multiplier, usually 1.5x for time-and-a-half or 2x for double time) times overtime hours. The effective hourly rate equals total pay divided by total hours worked.
Worked Examples
Example 1: Standard Overtime Calculation
Problem: An employee earns $25/hour, works 40 regular hours and 10 overtime hours at time-and-a-half. Calculate total weekly pay.
Solution: Regular pay = $25 × 40 = $1,000\nOT rate = $25 × 1.5 = $37.50/hour\nOT pay = $37.50 × 10 = $375\nTotal weekly pay = $1,000 + $375 = $1,375\n\nEffective hourly rate = $1,375 / 50 hours = $27.50/hour\nOT premium (extra above base) = $375 - ($25 × 10) = $125\nAnnual with OT = $1,375 × 52 = $71,500\nAnnual without OT = $1,000 × 52 = $52,000\nOT boost = $19,500/year (+37.5%)
Result: Weekly: $1,375 | Effective Rate: $27.50/hr | Annual: $71,500 | OT adds $19,500/year
Example 2: California Double Time Scenario
Problem: An employee in CA earns $30/hour, works 8 regular hours, 4 OT hours (1.5x), and 2 double-time hours in one day.
Solution: Regular pay = $30 × 8 = $240\nOT rate = $30 × 1.5 = $45/hour\nOT pay = $45 × 4 = $180\nDT rate = $30 × 2.0 = $60/hour\nDT pay = $60 × 2 = $120\n\nTotal daily pay = $240 + $180 + $120 = $540\nTotal hours = 14\nEffective rate = $540 / 14 = $38.57/hour\nOT premium = ($180 - $120) + ($120 - $60) = $120
Result: Daily Pay: $540 for 14 hours | Effective Rate: $38.57/hr | Premium earned: $120 above base
Frequently Asked Questions
How is overtime pay calculated under federal law?
Under the Fair Labor Standards Act (FLSA), non-exempt employees must be paid at least 1.5 times their regular rate of pay for all hours worked beyond 40 in a workweek. This is commonly called 'time-and-a-half.' The regular rate includes your base hourly rate plus certain other types of compensation like non-discretionary bonuses and shift differentials. For example, if your hourly rate is $25, your overtime rate is $25 x 1.5 = $37.50/hour. For 10 overtime hours, you'd earn $375 in OT pay. The FLSA does not require overtime pay for work on weekends, holidays, or regular days of rest unless the hours exceed 40 for the workweek. Some states have additional daily overtime requirements — California requires OT after 8 hours per day regardless of weekly total.
Who is exempt from overtime pay?
Under the FLSA, employees are classified as either 'exempt' or 'non-exempt' from overtime. Exempt employees do not receive overtime pay. To be exempt, an employee must generally: earn at least $684 per week ($35,568/year) on a salary basis, AND perform specific types of job duties. The main exemptions are: Executive (manages a department, supervises 2+ employees), Administrative (performs office work related to business operations), Professional (requires advanced knowledge in a specialized field), Computer (systems analysts, programmers earning $27.63+/hour), and Outside Sales. Simply being paid a salary does not make you exempt — both the salary threshold and duties test must be met. Many employers misclassify workers as exempt to avoid paying overtime, which is illegal. If you believe you've been misclassified, contact your state labor board or the Department of Labor.
Do some states have different overtime rules?
Yes, several states have overtime laws that go beyond federal requirements. California is the most notable: it requires overtime (1.5x) after 8 hours per day AND after 40 hours per week, plus double time (2x) after 12 hours per day or after 8 hours on the 7th consecutive workday. Alaska requires overtime after 8 hours per day. Colorado requires overtime after 12 hours per day or 40 hours per week. Nevada requires overtime after 8 hours per day if the employee's regular rate is less than 1.5x minimum wage. Oregon requires daily overtime in manufacturing. Some states also have specific requirements for certain industries. When both federal and state overtime laws apply, the employee is entitled to the higher overtime pay. Always check your state's specific rules, as they can significantly increase your overtime earnings.
How does overtime affect my taxes?
Overtime pay is taxed the same as regular income — there is no special higher tax rate for overtime. However, overtime can push your total earnings into a higher marginal tax bracket, meaning the additional income is taxed at a higher percentage. For example, if your regular salary puts you in the 22% bracket and overtime pushes some income into the 24% bracket, only the overtime income above the bracket threshold is taxed at 24%. Your base salary remains at 22%. Additionally, overtime increases your Social Security tax (6.2% up to $168,600) and Medicare tax (1.45%), and may push you past the $200,000 threshold for the 0.9% additional Medicare tax. Many people notice their OT checks seem heavily taxed — this is because employers withhold at a higher rate on larger checks, but you may get some back as a refund when you file your annual return.
What is the difference between overtime and double time?
Overtime (OT) typically refers to pay at 1.5 times your regular rate (time-and-a-half), while double time means pay at 2.0 times your regular rate. Federal law (FLSA) only requires time-and-a-half overtime and does not mandate double time. However, some states and employer policies include double-time provisions. In California, double time is required after 12 hours in a single workday and for all hours after 8 on the seventh consecutive workday in a workweek. Many union contracts include double-time provisions for holidays, weekends, or extremely long shifts. Some employers voluntarily offer double time on holidays or specific days. For a $25/hour worker: time-and-a-half = $37.50/hour, double time = $50/hour. Working 4 hours of double time earns $200 versus $150 at time-and-a-half — a $50 difference that adds up significantly over the year.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
References
Reviewed by Sahil, Senior Finance & Tax Editor · Editorial policy