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Practical calculators for everyday tasks, construction projects, work, measurements and digital media — with instant results, formulas and useful explanations.
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Fast calculators for some of the most common everyday and project calculations.
Percentage Calculator
Calculate percentages quickly with clear formulas and results.
Open calculator →EverydayAge Calculator
Calculate your exact age from your date of birth.
Open calculator →Time & WorkTime Card Calculator
Calculate weekly work hours from daily clock-in and clock-out times.
Open calculator →ConstructionFence Calculator
Estimate fence panels and posts from your project dimensions.
Open calculator →ConstructionGravel Calculator
Estimate cubic yards and approximate tons of gravel required.
Open calculator →ConstructionConcrete Slab Calculator
Estimate cubic yards of concrete required for a slab.
Open calculator →Find the calculation you need
CalculatorSquare is organized into focused categories so related tools are easy to discover.
Everyday
Percentages, age, dates, tips and other useful daily calculations.
Explore category →5 calculatorsTime & Work
Work hours, time cards, shifts and practical time calculations.
Explore category →40 calculatorsConstruction & DIY
Materials, quantities, roofing, gravel, concrete, paint and more.
Explore category →9 calculatorsDigital
Aspect ratios, file sizes, download times and data-transfer calculators.
Explore category →15 calculatorsElectrical
Ohm’s law, amps, watts, voltage drop and wire-size tools.
Explore category →7 calculatorsShipping & Freight
CBM, dimensional weight, freight density and pallet calculations.
Explore category →Calculations should be useful, fast and easy to understand.
We build practical tools that give you the answer quickly while also showing how the calculation works.
Core calculations run directly on your device for fast results.
Important calculator pages explain the method behind the result.
Real-world examples help make results easier to understand.
Open a calculator, enter your values and get your result.
Featured Guides
Practical explanations, formulas and examples to help you understand the calculations behind the tools.
How to Calculate Concrete: Cubic Yards, Bags and Waste
Learn how to calculate concrete volume in cubic feet and cubic yards, estimate concrete bags, and account for waste.
ElectricalOhm's Law Explained: Voltage, Current and Resistance
Learn how Ohm's Law connects voltage, current and resistance, with formulas, rearrangements and practical calculation examples.
ShippingCBM Explained: How to Calculate Cubic Meters for Shipping
Learn what CBM means in shipping, how to calculate cubic meters from package dimensions, and how to total multiple cartons.
DigitalDownload Speed and Download Time Explained
Learn how internet speed, file size, Mbps and MB/s affect download time, with formulas and practical examples.
EverydayHow to Calculate Percentage: Formulas and Examples
Learn how to calculate percentages, percentage change, percentage increase and decrease with simple formulas and examples.
Time & WorkHow to Calculate Work Hours and Break Time
Learn how to calculate hours worked from start and end times, subtract breaks and convert minutes to decimal hours.
Explore all 86 calculators.
Browse every calculator currently available on CalculatorSquare.