CalcCommonsFree online calculators.For everyday life.
From your next grade to your next home project. Make sense of the numbers, and move forward with confidence.
Your current grade, all added up.
There’s a tool for that.
Popular calculators
Browse all 20 tools →Grade Calculator
Calculate points-based or weighted grades, average assignments, and make a quick grading table.
Final Grade Calculator
Find the final exam score you need to reach a desired course grade.
GPA Calculator
Calculate credit-weighted GPA using an editable grade scale and optional course-level bonuses.
Fraction Calculator
Add, subtract, multiply, divide, and convert fractions, mixed numbers, and decimals.
Work Hours Calculator
Total multiple shifts, subtract breaks, and compare weekly regular and overtime hours.
Concrete Calculator
Estimate concrete for slabs, pads, footings, walls, and columns, with waste, bag yield, and cost.
Grade Calculator
Calculate points-based or weighted grades, average assignments, and make a quick grading table.
Final Grade Calculator
Find the final exam score you need to reach a desired course grade.
GPA Calculator
Calculate credit-weighted GPA using an editable grade scale and optional course-level bonuses.
Fraction Calculator
Add, subtract, multiply, divide, and convert fractions, mixed numbers, and decimals.
Percentage Calculator
Solve percent-of, percentage change, reverse percentage, and percentage difference problems.
Average Calculator
Find the arithmetic mean, sum, count, minimum, and maximum of a number list.
Scientific Notation Calculator
Convert standard and scientific notation and calculate with positive or negative exponents.
Long Division Calculator
Divide nonnegative whole numbers with a quotient, remainder, and generated division steps.
Factoring Calculator
Find integer factors, greatest common factors, and rational factors of quadratic trinomials.
Mean Median Mode Calculator
Compare mean, median, modes, range, and sorted values for a dataset.
Right Triangle Calculator
Solve a right triangle from two sides or one side and an acute angle.
Square Footage Calculator
Add room areas and quantities, convert square units, and estimate cost per square foot.
Area Calculator
Calculate the area of six geometric shapes with conversions to common square units.
Volume Calculator
Calculate prism, cube, cylinder, sphere, and cone volumes in cubic units, liters, and US gallons.
Concrete Calculator
Estimate concrete for slabs, pads, footings, walls, and columns, with waste, bag yield, and cost.
Gravel Calculator
Estimate gravel volume and approximate weight from dimensions, density, and waste allowance.
Cubic Yard Calculator
Convert a rectangular bed, round bed, or known area and depth into cubic yards.
Mulch Calculator
Estimate mulch in cubic yards and bags for a rectangular bed, round bed, or measured area.
Paint Calculator
Estimate paint for walls or a measured area. Account for openings, coats, coverage, and whole containers before you buy.
Flooring Calculator
Calculate flooring boxes from room dimensions or a known area, with adjustable waste, package coverage, and optional material cost.
Board Foot Calculator
Calculate lumber board feet from thickness, width, length, and quantity. Compare unit systems and estimate an allowance and lumber cost.
Stair Calculator
Plan a straight stair flight: calculate risers, tread count, equal riser height, and horizontal run from finished-floor measurements.
Roof Pitch Calculator
Convert roof rise and run, rise-in-12 pitch, or degrees into slope, angle, and slope length with a labeled diagram.
Fence Calculator
Estimate posts and panels or pickets for one straight fence run, with even section spacing and optional picket allowance.
Useful answers, with the working shown
Planning a garden bed, checking a course grade, or adding up a week of shifts? Choose a tool, enter your numbers, and get an answer with the assumptions explained. Our formulas and worked examples are available on every calculator page.