Concrete Calculator: Estimate Volume, Bags, and Cost for Various Shapes
Estimate concrete volume by inputting shape, size, waste %, and cost; one 50-kg bag covers about 0.017 m³ of mix (Quikrete, 2022).
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Go toConcrete Calculator: Estimate Volume, Bags, and Cost for Various Shapes
Percent Increase Calculator: Easy Tool to Measure Value Changes
Enter the starting and ending numbers, hit “Calculate,” and the tool instantly shows the percentage change—positive or negative. Example: 80 to 100 equals a 25 % rise (Khan Academy, https://www.khanacademy.org).
Day Counter Calculator: Easily Calculate Days Between Dates
Enter two dates, choose whether to count the last day and/or skip weekends, then read the total—no math needed. Automated date tools cut scheduling errors by up to 30 % (PMI, 2021).
Days Calculator: Easily Compute Time Intervals & Business Days
Enter two dates, decide if you want the last day counted, and pick calendar or business-only mode—the tool does the rest. JavaScript subtracts the time stamps, divides by 86 400 000 ms, then adjusts for weekends. Projects tracked this way finish on schedule 52 % more often (PMI, 2021).
Inflation Calculator: Compare Purchasing Power Across Years (1913-2022)
The calculator shows what yesterday’s dollars are worth today by applying Consumer Price Index data—prices in 2022 are roughly 2 900 % higher than in 1913 (BLS CPI Tables, 2023).
Ovulation Calculator: Predict Fertile Window and Next Period Date
Unlock the secrets of your menstrual cycle with our advanced Ovulation Calculator. Discover your fertile window, predict ovulation, and gain valuable insights into your reproductive health. Whether you're planning a family or tracking your cycle, this tool empowers you with personalized predictions. Learn how to take control of your fertility today!
Car Loan Calculator: Estimate Monthly Payments & Total Costs Easily
The Car Loan Calculator shows your loan amount, monthly payment and lifetime interest in seconds. Adjust price, fees, term or rate to see instant changes. Average new-car APR hit 6.63 % in Q3 2023 (Experian, 2023).
Pregnancy Due Date Calculator: Estimate EDD, Gestational Age & Milestones
Enter the first day of your last period, conception, or embryo-transfer date and your usual cycle length; the calculator adds 280 days (plus any cycle adjustment) to estimate birth, a method that brackets 90 % of deliveries within ±14 days (ACOG, 2017). It also shows gestational age, trimester and key fetal milestones.
Date Calculator: Difference, Add/Subtract Time, Find Day of Week
The JavaScript Date Calculator lets you (1) count days between dates, (2) add or subtract days, weeks, months or years, and (3) show the weekday for any date—all in one click. It applies the Unix-epoch millisecond formula and adjusts for leap years, so results stay accurate; the Gregorian calendar has 97 leap years every 400-year cycle (ISO 8601:2019).