Browse by category

Explore focused calculators and utility pages organized by topic. Each tool is built to answer one common question quickly, with clear inputs, fast results, and supporting explanations on the page.

Date

• Business Days Between Dates CalculatorCalculate the number of business days between two dates.
• Add Business Days CalculatorAdd or subtract business days from a starting date.
• Days Between Dates CalculatorCalculate the number of calendar days between two dates.
• Weeks Between Dates CalculatorCount full weeks, remaining days, and decimal weeks between two dates.

Time and pay

• Hours Between Two Times CalculatorFind the duration between two times, including overnight ranges.
• Hours Worked CalculatorCalculate paid work time from start time, end time, and breaks.
• Hours To Decimal CalculatorConvert hours and minutes into payroll-friendly decimal hours.
• Hourly To Salary CalculatorConvert hourly pay into weekly, monthly, and annual salary estimates.
• Overtime CalculatorEstimate regular pay, overtime pay, and total gross pay.
• Time And A Half CalculatorEstimate premium pay for hours paid at 1.5 times the regular rate.
• Commission CalculatorEstimate commission pay and total earnings from sales amount and commission rate.
• Shift Differential CalculatorEstimate premium shift pay from hourly rate, hours worked, and differential percentage.
• Pay Raise CalculatorEstimate raise amount, new pay, and yearly impact from a current pay amount and raise percentage.
• Time Card CalculatorCalculate paid hours, decimal hours, and gross pay from a daily shift time card.
• PTO Accrual CalculatorEstimate earned PTO hours, PTO days, and yearly accrual totals.
• Military Time ConverterConvert between standard time and 24-hour military time.
• Salary to Hourly CalculatorConvert annual salary into hourly pay.

Percentage

• Percentage Difference CalculatorCompare two values and calculate their percentage difference.
• Percentage Of Number CalculatorFind a percentage amount from any number.
• Discount CalculatorCalculate the amount saved and final price from an original price and discount percentage.
• Markup CalculatorCalculate markup amount, markup percentage, and gross margin from cost and selling price.
• Margin CalculatorCalculate gross profit, gross margin percentage, and markup percentage from selling price and cost.
• Reverse Percentage CalculatorWork backward to find the original value before a percentage change.
• Percentage Increase CalculatorCalculate percentage increase from an original value and a new value.
• Percentage Decrease CalculatorCalculate percentage decrease from an original value and a new value.

Math

• Average CalculatorFind the average, total, count, and range of a list of numbers.
• Ratio CalculatorCompare two values, simplify the ratio, and see the percentage split.
• Fraction To Decimal CalculatorConvert a fraction into decimal, percentage, and mixed-number form.
• Decimal To Fraction CalculatorConvert a decimal into a simplified fraction, percentage, and mixed number.
• Median CalculatorFind the middle value in a sorted list of numbers.
• Mode CalculatorFind the most frequent value or values in a list of numbers.
• Standard Deviation CalculatorMeasure spread with population and sample standard deviation.

Utility

• Character CounterCount characters with and without spaces, plus words, lines, and reading time.
• Title Case ConverterConvert text so each word starts with a capital letter.
• Sentence Case ConverterConvert text so each sentence starts with a capital letter.
• Reading Time CalculatorEstimate how long a block of text may take to read.
• Word CounterCount words, characters, sentences, and reading time.
• Random Number GeneratorGenerate one or more random whole numbers.

Finance

• Loan Payoff CalculatorEstimate payoff time, total interest, and total amount paid from balance, rate, and monthly payment.
• Extra Payment Mortgage CalculatorEstimate regular mortgage payment, faster payoff time with extra payments, and interest saved.

About Quick Tool Labs

Quick Tool Labs focuses on single-purpose tools with fast load times, clear answers, and straightforward layouts. The goal is to make everyday calculations and quick checks easier to do without extra clutter.