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Free calculators for math, education, time, and everyday tasks. No sign-up required.

GPA Calculators Unit Converters Math Calculators

Popular Calculators

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Campaign Forecast Calculator

Free ad campaign forecast calculator. Enter cost, impressions, CTR, conversion rate, and revenue per conversion to estimate CPM, CPC, CPA, clicks, conversions, revenue, ROAS, and profit.

CPM Calculator

Free CPM calculator. Solve for CPM, ad spend, or impressions — enter any two and get the third. Includes the CPM formula, worked examples, and vCPM / invalid-impression tips.

Random Number Generator

Free random number generator. Generate one or multiple random integers in any range. Options for min, max, and quantity. No sign-up required.

Grade Calculator

Free grade calculator. Enter assignment grades and weights to find your overall course grade. Also calculates what you need on your final exam.

College GPA Calculator

Free college GPA calculator. Enter your letter grades and credit hours to instantly calculate your semester or cumulative GPA on the standard 4.0 scale.

High School GPA Calculator

Free high school GPA calculator with weighted and unweighted GPA. Supports Regular, Honors, and AP/IB courses. Calculate your GPA instantly.

Browse by Category

Math

Random Number Generator

Free random number generator. Generate one or multiple random integers...

Percentage Calculator

Free percentage calculator. Calculate what percent of any number insta...

Fraction Calculator

Free fraction calculator. Add, subtract, multiply, or divide two fract...

Percentage Change Calculator

Free percentage change calculator. Enter the original and new values t...

Average Calculator

Free average calculator. Enter a list of numbers to find the mean, med...

Speed Distance Time Calculator

Free speed distance time calculator. Enter any two values to solve for...

Area Calculator

Free area calculator for rectangle, square, circle, triangle, parallel...

Volume Calculator

Free volume calculator. Select a 3D shape and enter dimensions to calc...

Ratio Calculator

Free ratio calculator. Solve proportions by finding the missing value ...

Standard Deviation Calculator

Free standard deviation calculator. Enter your data to calculate stand...

Quadratic Formula Calculator

Free quadratic formula calculator. Solve any quadratic equation with s...

Aspect Ratio Calculator

Free aspect ratio calculator. Find the aspect ratio of any image or vi...

GCF Calculator (Greatest Common Factor)

Free GCF calculator. Find the greatest common factor of two or more nu...

LCM Calculator (Least Common Multiple)

Free LCM calculator. Find the least common multiple of two or more num...

Slope Calculator

Free slope calculator. Find slope, y-intercept, equation, angle, and d...

Pythagorean Theorem Calculator

Free Pythagorean theorem calculator. Find any side of a right triangle...

Circle Calculator

Free circle calculator. Find radius, diameter, circumference, and area...

Triangle Calculator

Free triangle calculator. Solve any triangle from any 3 values (SSS, S...

Exponent Calculator

Free exponent calculator. Compute any base raised to any power with st...

Logarithm Calculator

Free logarithm calculator. Compute log base any value with step-by-ste...

Prime Number Checker

Free prime number checker. Check if any number is prime with step-by-s...

Factorial Calculator

Free factorial calculator. Compute factorial of any number up to 1000 ...

Measurement

Square Footage Calculator

Free square footage calculator. Enter length and width to calculate ar...

Concrete Calculator

Free concrete calculator. Calculate cubic yards for slabs, columns, wa...

Paint Calculator

Free paint calculator. Find exactly how many gallons you need for any ...

Wallpaper Calculator

Free wallpaper calculator with pattern-repeat math, US double-roll and...

Drywall Calculator

Free drywall calculator. Compute sheets, screws, joint tape, and joint...

Insulation Calculator

Free insulation calculator. Find bags or sheets needed for any R-value...

Wood Stain Calculator

Free wood stain calculator. Find gallons needed for decks, fences, rai...

Flooring Calculator

Free flooring calculator. Find exact planks and boxes needed for lamin...

Fence Calculator

Free fence calculator. Compute posts, rails, pickets, concrete for fen...

Chain Link Fence Calculator

Free chain link fence calculator. Find terminal posts, line posts, top...

Wire Fence Calculator

Free woven wire / field fence calculator. Find T-posts, wood corner po...

Mulch Calculator

Free mulch calculator finds the cubic yards and number of bags of mulc...

Gravel Calculator

Free gravel calculator finds how many tons and cubic yards of gravel y...

Topsoil Calculator

Free topsoil calculator: find the cubic yards, bags, and bulk cost of ...

Sand Calculator

Free sand calculator: find the tons, cubic yards, and bags of sand for...

Tile Calculator

Free tile calculator finds how many tiles and boxes you need for a flo...

Grout Calculator

Free grout calculator finds how many pounds and bags of grout you need...

Brick Calculator

Free brick calculator finds how many bricks and mortar bags you need f...

Paver Calculator

Free paver calculator finds how many pavers you need for a patio or wa...

Vinyl Fence Calculator

Free vinyl fence calculator finds how many PVC fence panels, posts, ca...

Deck Board Calculator

Free deck board calculator finds how many deck boards, screws, and hid...

Fence Post Calculator: Posts & Concrete for a Fence Line

Free fence post calculator finds how many fence posts and concrete bag...

Fence Cost Calculator

Free fence cost calculator estimates your total fence price by length,...

Roofing Calculator

Free roofing calculator estimates shingle bundles and squares from you...

Carpet Calculator

Free carpet calculator finds the square yards and square feet you need...

Board Foot Calculator

Free board foot calculator: enter thickness, width, length and quantit...

Stud Calculator

Free stud calculator finds how many wall studs you need by wall length...

Concrete Block Calculator

Free concrete block calculator: enter your wall length and height to g...

Roof Pitch Calculator

Free roof pitch calculator: enter rise and run to get pitch ratio (x:1...

BTU Calculator — How Many BTU to Heat or Cool a Room

Free BTU calculator to size an air conditioner or heater by room squar...

Baseboard Calculator: Linear Feet & Boards for a Room

Free baseboard calculator: enter your room length, width, and number o...

Rebar Calculator

Free rebar calculator: enter slab length, width and grid spacing to ge...

Plywood Sheet Calculator

Free plywood sheet calculator: find how many 4x8 sheets you need to co...

Asphalt Calculator: How Many Tons for a Driveway

Free asphalt calculator that turns your driveway length, width and dep...

Excavation Calculator

Free excavation calculator: enter length, width, and depth to get cubi...

Crown Molding Calculator: Pieces & Linear Feet

Free crown molding calculator: find the linear feet and number of crow...

Retaining Wall Calculator – Blocks & Base Gravel

Free retaining wall calculator: enter wall length, height and block si...

material

Deck Stain Calculator

Free deck stain calculator: enter your deck's length, width, and numbe...

Floor Joist Calculator

Free floor joist calculator: enter your deck or floor length, width, a...

Thinset Calculator

Free thinset calculator: enter your tile area and trowel size to get h...

Post Hole Concrete Calculator

Free post hole concrete calculator: find how many bags of concrete per...

Paver Calculator

Free paver calculator estimates how many pavers you need for a patio b...

French Drain Gravel Calculator

Free french drain gravel calculator: enter trench length, width, and d...

Stair Calculator

Free stair calculator: enter total rise and run to get the number of s...

Sonotube Calculator: How Many Bags of Concrete per Tube Form

Free sonotube calculator: enter tube diameter, height and count to get...

Footing Calculator: How Much Concrete for a Strip Footing

Free footing calculator: enter length, width and depth to get cubic ya...

Siding Calculator: How Many Squares of Siding Do I Need?

Free siding calculator: enter wall length, height, doors and windows t...

Landscape Edging Calculator: How Much Edging for Your Garden Bed

Free landscape edging calculator: get the linear feet of edging for a ...

Soffit Calculator: How Many Soffit Panels Do I Need?

Free soffit calculator: enter eave length and overhang width to get so...

Flagstone Calculator: How Many Tons for Your Patio or Path

Free flagstone calculator: find how many tons of flagstone you need fo...

Wainscoting Calculator: How Many Panels and How Much Trim for a Room

Free wainscoting calculator: enter room size and wainscot height to se...

Frequently Asked Questions

What calculators does CalculatorSwitch offer? +
CalculatorSwitch offers free online calculators across multiple categories: math (percentages, fractions, averages), education (GPA, grades), time and date, work hours, everyday tools (tips, discounts, fuel cost), unit conversions (temperature, weight, length, volume), and more.
Are these calculators free to use? +
Yes, every calculator on CalculatorSwitch is completely free with no sign-up, no paywalls, and no limits on usage. All calculations run in your browser — we don't store any data.
How accurate are the calculators? +
All calculators use verified formulas and internationally standardized conversion factors. Results are calculated with full precision and rounded for readability. Every formula is tested against multiple sources before publication.