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Practical calculators designed to give you useful results without making simple things complicated.
Popular Calculators
Start with some of our most useful calculators and estimators.
Estimate your golf Handicap Index from recent scores, Course Rating and Slope Rating.
EngineeringEstimate solar system size from electricity use, peak sun hours and system efficiency.
AutomotiveEstimate journey fuel use and cost from distance, fuel economy and fuel price.
Home & BuildingEstimate heating costs from energy use, fuel price and heating system efficiency.
Shipping & LogisticsCompare actual and volumetric weight to estimate chargeable shipping weight.
MoneyCalculate the return on ad spend needed to cover costs and break even.
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Explore calculators by subject and find the right tool for the job.
Home & Building
Building, materials, heating, drainage and practical home project calculations.
Explore Home & Building →Engineering
Practical engineering tools for structures, fluids, fabrication and technical calculations.
Explore Engineering →Math
Area, geometry and other useful mathematical calculations for everyday and technical problems.
Explore Math →Money
Commission, cash flow and other practical financial calculations.
Explore Money →Conversions
Convert measurements, values and technical units quickly and clearly.
Explore Conversions →Agriculture
Field, crop and agricultural planning calculators for practical use.
Explore Agriculture →Work & Pay
PTO, vacation accrual, earnings and other workplace calculations.
Explore Work & Pay →Time & Date
Working time, due dates and other useful time and date calculations.
Explore Time & Date →Shipping & Logistics
Shipping weight, freight and practical logistics calculations for parcels and deliveries.
Explore Shipping & Logistics →Automotive
Fuel, journey and vehicle-related calculations for everyday driving and trip planning.
Explore Automotive →Sports
Handicap and other useful sporting calculations for golf and additional sports.
Explore Sports →All Calculators
Browse the complete CalcAtlas collection as new calculators are added.
View all calculators →Useful answers without unnecessary complication.
CalcAtlas is built around practical tools that are easy to use and simple to understand. Enter the information you know, get a clear result and see what the numbers mean.
Simple inputs
Clear questions and familiar units without unnecessary technical language.
Clear results
Important answers are shown prominently, with useful breakdowns where they help.
Useful explanations
Understand how a result was calculated rather than being given a number with no context.
Works on any device
CalcAtlas calculators are designed to work comfortably on desktop, tablet and mobile.