Toolnoza

Math & Date Calculators

Work with percentages, scientific expressions, dates and proportions. Each calculator explains its inputs and assumptions.

What Is Today’s Date?See today’s date, weekday and ISO date in your local time zone or a selected time zone.Ratio SimplifierReduce the ratio of two positive integers.Average Calculator — Mean, Median & Weighted AverageCalculate arithmetic or weighted averages, median, sum, count and range. Enter numbers and optional weights with calculation steps.Fraction CalculatorAdd, subtract, multiply or divide two fractions.Fuel Consumption CalculatorCalculate liters per 100 km and distance per liter.Running Pace CalculatorCalculate minutes per kilometer and average speed.Percentage CalculatorCalculate a percentage of a number, a ratio or a percentage change.Age CalculatorFind your age in completed years, months and days.Date Difference CalculatorCount days and full weeks between two calendar dates.Aspect Ratio CalculatorFind an image ratio and resize dimensions without stretching.Random Number GeneratorGenerate one or many random integers in an inclusive range, with an optional no-duplicates mode.

Practical guides: Math & Date Calculators

How to Calculate Age on a Specific DateCalculate age in completed years, months and days, and understand month-end birthdays with a worked example.Days Between Dates: Inclusive vs Elapsed CountingLearn when to include both dates, convert a duration into weeks and avoid confusing calendar days with business days.Image Aspect Ratio and Matching DimensionsReduce image width and height to a ratio, calculate matching dimensions and choose between cropping and resizing.Percentage of a Total vs Percentage ChangeChoose the right percentage formula for shares, discounts and increases, with three worked examples.Convert km/h, mph and Metres per SecondUse consistent conversion factors, check a worked example and avoid confusing speed with running pace.Add, Subtract, Multiply and Divide FractionsUse common denominators correctly, simplify answers and check why a fraction denominator cannot be zero.Calendar Days vs Working Days: How to Count a DeadlineCalendar Days vs Working Days: How to Count a Deadline — Practical steps, examples, common mistakes and FAQs on Toolnoza.Mixed Numbers to Improper Fractions: Add and Divide CorrectlyMixed Numbers to Improper Fractions: Add and Divide Correctly — Practical steps, examples, common mistakes and FAQs on Toolnoza.Grade Calculator: How to Calculate Your Class AverageCalculate an unweighted grade average, follow a worked example and see when a weighted-grade formula is needed.Attendance Calculator: Percentage Formula and Classes NeededCalculate class attendance percentage and estimate how many consecutive classes you need to attend to reach a target.CGPA Calculator: Formula, Credit Hours and Worked ExampleCalculate cumulative GPA as a credit-weighted average and avoid common mistakes with grade-point scales and repeated courses.Study Hours Calculator: Plan Weekly and Daily Study TimeEstimate weekly and daily study hours from course credits, planned hours per credit and available study days.Test Grade Calculator: Calculate Your Score and PercentageCalculate a test percentage from correct answers, convert it to a score out of 20 and understand when weighted grading changes the result.Average Down Calculator: Find Your New Average Cost per ShareCalculate a weighted average purchase price after adding units at a new price, including new fees, and see what the result does not mean.Slope Percentage Calculator: Formula, Rise, Run and DegreesCalculate grade percentage and angle from vertical rise and horizontal run, with a worked example and the difference from roof pitch notation.How to Estimate Adult Height from Parents: Formula and ExampleLearn the mid-parental height formula, work through an example and convert cm to feet and inches with clear limits.Mean vs Median vs Weighted Average: How to Calculate EachChoose the right average, follow worked examples and avoid averaging groups without accounting for their sizes.Find Least Common Multiple: LCM Methods, Examples and CalculatorTo find the least common multiple of positive integers, choose the smallest number divisible by every input. Learn three methods, check worked examples and use the free LCM calculator for exact results.How to resize a photo without stretching itKeep the original aspect ratio when resizing, and distinguish a proportional resize from a crop.