All Calculators

All Calculators A-Z

Browse every free calculator on CalcGems. Click any row to start calculating.

A

Age CalculatorCalculate your exact age in years, months, days, and weeks. Find out how many days until your next birthday. Amortization Schedule CalculatorGenerate a year-by-year breakdown of principal and interest for any loan. APR CalculatorConvert a nominal APR to the effective annual rate (EAR) accounting for compounding frequency. Area CalculatorCalculate the area and perimeter of squares, rectangles, circles, triangles, and trapezoids instantly. Asphalt CalculatorEstimate tons of asphalt needed for a driveway or parking area. Auto Loan CalculatorCalculate monthly payments, total interest, and total cost for any car loan. Average (Mean) CalculatorCalculate the mean, median, mode, and range of any set of numbers.

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BAC CalculatorEstimate blood alcohol content based on drinks, weight, gender, and time. BMI CalculatorFree BMI calculator. Metric or imperial. Get your BMI and category instantly. BMI Calculator for KidsCalculate BMI-for-age for children and teens (2-19) with percentile guidance. BMR CalculatorCalculate your Basal Metabolic Rate — calories your body burns at complete rest. Board Foot CalculatorCalculate board feet for lumber based on thickness, width, length, and quantity. Body Fat CalculatorEstimate body fat percentage using the U.S. Navy circumference method. Break-Even CalculatorFind your break-even point in units and revenue. Essential for business planning and pricing. Business Days CalculatorCalculate working days between two dates, excluding weekends.

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Calorie Burn CalculatorEstimate calories burned during exercise based on MET value, weight, and duration. Calorie CalculatorCalculate your daily calorie needs (TDEE) based on age, weight, height, gender, and activity level. Carbon Footprint CalculatorEstimate your annual carbon emissions from driving, flights, and home energy use. Cash Back CalculatorCompare flat-rate and tiered cash back credit card rewards based on your spending. Circle CalculatorFind area, circumference, diameter, and radius of a circle from any known value. Color ConverterConvert HEX color codes to RGB and HSL values instantly. Combination & Permutation CalculatorCalculate combinations (nCr) and permutations (nPr) for any set size and selection count. Compound Interest CalculatorFree compound interest calculator. Enter principal, rate, compounding frequency, and years to see your final balance and total interest earned. Concrete CalculatorFree concrete calculator for slabs, columns and footings. Get cubic yards and bag counts with 10% waste factor. Cooking Measurement ConverterConvert between cups, tablespoons, teaspoons, ml, fl oz, and weight units for any recipe. Countdown CalculatorCount the exact days, hours, minutes, and seconds until any future date and time. Credit Card Payoff CalculatorSee how long it takes to pay off credit card debt and how much interest you will pay. Currency ConverterConvert amounts between currencies using a custom exchange rate.

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Date Difference CalculatorFree date difference calculator. Find the exact number of days, weeks, months, and years between any two dates. Handles leap years and future dates automatically. Days Until CalculatorCount exact days until any future date, or days since a past date. Debt-to-Income CalculatorCalculate your debt-to-income ratio to understand your borrowing capacity. Deck CalculatorEstimate deck boards and framing materials for a rectangular deck. Discount CalculatorCalculate sale prices, savings, and final cost after discount. Optionally add sales tax for the true checkout price. Drywall CalculatorCalculate how many drywall sheets you need for walls and ceilings.

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Exponent CalculatorCalculate powers, roots, squares, cubes and nth roots — the E in GEMS.

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Factorial CalculatorCalculate the factorial of any non-negative integer (n!). Fence CalculatorEstimate fence posts, rails, and pickets needed for a linear fence run. Flooring CalculatorCalculate flooring area for multiple rooms with waste percentage and box count. Fraction CalculatorAdd, subtract, multiply, and divide fractions instantly. Get simplified results with decimal equivalents. Fraction SimplifierReduce any fraction to its simplest form by dividing numerator and denominator by their GCF. Fuel Cost CalculatorCalculate trip fuel cost, gallons used, and cost per mile for any vehicle and distance.

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Gas Mileage CalculatorCalculate MPG or fuel efficiency from miles driven and gallons used. GPA CalculatorCalculate your GPA on a 4.0 scale with multiple courses and credit hours. Grade CalculatorCalculate your final grade from individual assignment scores and their weight percentages. Graphing CalculatorPlot up to 4 mathematical functions simultaneously on an interactive dark canvas. Pan, zoom, and explore math visually with GEMS colors. Gravel CalculatorFree gravel calculator. Get cubic yards and estimated weight for any area dimensions and depth.

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Heart Rate Zone CalculatorCalculate your 5 heart rate training zones using the Karvonen formula based on age and resting HR. Hourly to Salary CalculatorConvert between hourly wage and annual salary. Get daily, weekly, biweekly, and monthly pay. Hours CalculatorAdd or subtract hours and minutes from a starting time.

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Ideal Weight CalculatorEstimate ideal body weight using Robinson, Miller, Devine, and Hamwi formulas. Inflation CalculatorFind what a past dollar amount is worth today using an average inflation rate. Insulation CalculatorCalculate square footage of insulation needed for walls, ceilings, and floors.

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Lap Time CalculatorEnter lap split times to calculate total time, average lap, fastest lap, and slowest lap. LCM & GCF CalculatorFind the least common multiple and greatest common factor of two or more numbers. Lean Body Mass CalculatorEstimate your lean body mass and body fat percentage from weight and body measurements. Loan Payment CalculatorCalculate monthly payments, total interest, and full cost of any loan. Logarithm CalculatorCalculate logarithms in any base. Convert between natural log, base-10, and custom bases.

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Macro CalculatorCalculate daily calories and macronutrient targets (protein, carbs, fat) for your fitness goal. Markup CalculatorCalculate selling price from cost and markup percentage, or find markup from cost and price. Midpoint CalculatorFind the midpoint between two coordinate points on a 2D plane. Mortgage CalculatorFree mortgage calculator. Enter your loan amount, interest rate, and term to find your monthly payment, total payment, and total interest paid. Mulch CalculatorCalculate cubic yards, cubic feet, and bags of mulch needed for garden beds.

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Net Worth CalculatorAdd up assets and liabilities to calculate your total net worth. Number Base ConverterConvert numbers between binary, octal, decimal, and hexadecimal bases instantly. Number Rounding CalculatorRound any number to a specified number of decimal places or significant figures.

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One Rep Max CalculatorEstimate your one-rep max based on weight lifted and reps performed. Ovulation CalculatorEstimate your fertile window and next ovulation date based on cycle length.

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Pace to Speed CalculatorConvert running pace (minutes per mile) to speed in mph or km/h. Paint CalculatorCalculate how many gallons of paint you need based on room dimensions, doors, windows, and coats. Password GeneratorGenerate strong, random passwords with letters, numbers, and symbols. Percentage CalculatorFree percentage calculator. Find what percent of a number is, calculate percentage change, or figure out what percentage one number is of another. Instant results. Percentage Change CalculatorCalculate percentage increase/decrease between values, find new values, or reverse-calculate originals. Perimeter CalculatorCalculate the perimeter of rectangles, triangles, circles, and other common shapes. Pregnancy Due Date CalculatorCalculate your estimated due date from LMP, conception date, or ultrasound. Includes trimester tracking. Prime Factorization CalculatorFactor any positive integer into its prime factors and see the factor tree summary. Proportion CalculatorSolve proportions and cross-multiplication problems instantly. Find the missing value in A : B = C : X.

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QR Code GeneratorGenerate a QR code image from any text or URL. Quadratic Formula CalculatorSolve quadratic equations with the quadratic formula. Find roots, discriminant, and vertex.

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Random Number GeneratorGenerate random integers, decimals, dice rolls, or coin flips instantly. Ratio CalculatorSimplify ratios, solve for unknowns, and scale ratios up or down instantly. Recipe ScalerScale any recipe up or down by servings or a custom multiplier. Retirement Savings CalculatorProject your retirement balance and monthly income based on savings, contributions, and return rate. ROI CalculatorCalculate return on investment, net gain or loss, and annualized ROI percentage. Roof Pitch CalculatorCalculate roof pitch as a ratio, angle in degrees, and total roof surface area. Roofing CalculatorCalculate roof area, roofing squares, and shingle bundles needed based on dimensions and pitch. Running Pace CalculatorCalculate running pace, finish time, or distance for any race or training run.

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Salary ConverterConvert between hourly wage, monthly salary, and annual salary. Sales Tax CalculatorAdd tax to a price, reverse-calculate pre-tax from a total, or find the tax rate. Savings Goal CalculatorCalculate how long to reach your savings goal with monthly contributions and interest. Scientific CalculatorA full scientific calculator with trig functions, logarithms, exponents, and constants. Perfect for algebra, physics, and engineering. Shoe Size ConverterConvert shoe sizes between US, EU, UK, and cm measurements for men and women. Simple Interest CalculatorCalculate simple interest and total balance without compounding. Sleep Cycle CalculatorFree sleep cycle calculator. Find the best time to go to bed or wake up based on 90-minute cycles. Slope CalculatorFind the slope between two points and get the y=mx+b equation of the line. Speed Distance Time CalculatorCalculate speed, distance, or travel time. Enter any two values to find the third. Stair CalculatorCalculate the number of risers, tread depth, and stringer length for a staircase. Statistics CalculatorCalculate mean, median, mode, standard deviation, and more from any data set.

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Temperature ConverterConvert between Celsius, Fahrenheit, and Kelvin instantly. Tile CalculatorCalculate tile quantity needed for floors or walls with waste factor. Time Addition CalculatorSum multiple time durations (hours:minutes:seconds) into a total. Time Card CalculatorCalculate total work hours from clock-in, clock-out, and break times. Time Duration CalculatorFree time duration calculator. Enter a start time and end time to calculate the hours, minutes, and seconds between them. Works overnight and across midnight. Time Zone ConverterConvert date and time between 18 major world time zones with automatic DST support. Tip CalculatorFree tip calculator. Enter bill, choose tip %, split between any number of people. Instant per-person breakdown. Tip Split CalculatorCalculate tip, total bill, and split the cost evenly among any number of people. Tire Size CalculatorCompare tire sizes and see diameter, sidewall height, and circumference differences. Triangle CalculatorSolve right triangles: find missing sides and angles using the Pythagorean theorem and trigonometry.

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Unit ConverterConvert between units of length, weight, temperature, volume, area, and speed. Fast, accurate, and free.

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Volume CalculatorCalculate the volume of cubes, cylinders, spheres, and cones.

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Wallpaper CalculatorEstimate rolls of wallpaper needed for a room based on wall dimensions. Water Intake CalculatorCalculate your recommended daily water intake based on weight, activity level, and climate. Week Number CalculatorFind the ISO week number for any date. Word CounterCount words, characters, sentences, and paragraphs in any text. Work Hours CalculatorTrack weekly work hours by day with start/end times, breaks, and optional hourly pay.

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Z-Score CalculatorCalculate the z-score to find how many standard deviations a value is from the mean.