Find your answer.
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.
Browse by Category
Explore our main calculator categories or browse the complete collection.
Engineering
Pipe flow, pumps, electrical systems, fabrication, solar PV and other technical calculations.
Explore Engineering →Home & Building
Building materials, heating costs, roof drainage, pool measurements and practical property calculations.
Explore Home & Building →Money
Present value, commissions, advertising break-even calculations and estimated tax savings.
Explore Money →Work & Pay
PTO payouts, vacation accrual and other practical workplace calculations.
Explore Work & Pay →Time & Date
Working hours, time cards, invoice due dates and other practical time calculations.
Explore Time & Date →All Calculators
Browse every CalcAtlas calculator, including automotive, sports, math, conversions, agriculture and shipping tools.
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.