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 40 tools →Grade Calculator
Calculate your class grade from points or weighted assignments, or find a test grade from questions missed.
Final Grade Calculator
Find the final exam score you need from percentage or letter-grade goals.
GPA Calculator
Calculate term, cumulative or full-year GPA. Combine completed terms by GPA credits and plan your next goal.
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 your class grade from points or weighted assignments, or find a test grade from questions missed.
Final Grade Calculator
Find the final exam score you need from percentage or letter-grade goals.
GPA Calculator
Calculate term, cumulative or full-year GPA. Combine completed terms by GPA credits and plan your next goal.
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.
LCM Calculator
Find the least common multiple of two or more integers, with exact answers and Euclidean-algorithm steps.
Quadratic Formula Calculator
Solve ax² + bx + c = 0 for real or complex roots, with the discriminant, vertex and a curve preview.
Percent Error Calculator
Compare a measured value with a reference value and find absolute percentage error, signed difference and direction.
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.
Roof Calculator
Estimate roof surface area, roofing squares and shingle bundles from a horizontal footprint and pitch. Add waste and an optional material price.
Pool Calculator
Find pool water volume in US gallons, liters or cubic units. Choose a rectangular, round or oval pool and enter actual water depths.
Masonry Calculator
Estimate bricks or concrete blocks for a wall, including openings, mortar joints, multiple wythes and waste. Use preset or custom face dimensions.
Asphalt Calculator
Estimate asphalt mixture volume, order weight and optional material cost from paving area, compacted thickness and supplier density.
Drywall Calculator
Estimate drywall panel quantities for room walls and ceilings, with opening deductions, panel sizes, waste and optional material cost.
Siding Calculator
Estimate exterior siding packages from wall and gable area, openings, effective product coverage and waste.
Framing Calculator
Estimate studs and plate stock for a simple straight wall, with editable spacing, actual plate thickness and a transparent material list.
Insulation Calculator
Estimate packages of insulation batts, rolls or boards from coverage area, exclusions, labeled package coverage and allowance.
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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.