Pro Calculators and Guides
How to Use ESPP Tax Calculator: Qualifying vs Disqualifying Sale Online for Free: Step-by-Step Guide
Work out your ESPP purchase price, shares and tax for a qualifying or disqualifying sale. Free, private and no sign-up.
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Pro Calculators and Guides
Specialist calculators are only useful when you understand the rules behind the numbers. These guides explain what each professional calculator does, which inputs matter, how to read the result and where the official rules come from, covering payroll and tax, immigration and visas, housing, business compliance, engineering and science. Every guide links to a free tool that runs in your browser and keeps your figures private.
318 guides
Pro Calculators and Guides
How to Use EV vs Gas Car Cost Calculator Online for Free: Step-by-Step Guide
Compare the yearly running cost of an electric car and a gas car and find the break-even point. Free, private and no sign-up.
Pro Calculators and Guides
How to Use Fence Calculator: Posts, Pickets and Rails Online for Free: Step-by-Step Guide
Count the posts, pickets, rails and concrete bags for a fence run. Free, private and no sign-up.
Pro Calculators and Guides
How to Use Foreign Earned Income Exclusion (FEIE) Calculator Online for Free: Step-by-Step Guide
Estimate the foreign earned income exclusion, housing exclusion and the US tax it saves. Free, private and no sign-up.
Pro Calculators and Guides
How to Use LDL Cholesterol Calculator (Friedewald Equation) Online for Free: Step-by-Step Guide
Calculate LDL cholesterol from total cholesterol, HDL and triglycerides. Free, private and no sign-up.
Pro Calculators and Guides
How to Use Generator Size Calculator: Running and Starting Watts Online for Free: Step-by-Step Guide
Add up running watts and the largest starting surge to choose a generator size. Free, private and no sign-up.
Pro Calculators and Guides
How to Use Home Office Deduction Calculator (Simplified vs Actual) Online for Free: Step-by-Step Guide
Compare the simplified $5 per square foot method with the actual-expense home office deduction. Free, private and no sign-up.
Pro Calculators and Guides
How to Use Paint Calculator: Gallons for a Room Online for Free: Step-by-Step Guide
Work out how many gallons of paint a room needs for the number of coats you plan. Free, private and no sign-up.
Pro Calculators and Guides
How to Use HSA Growth Calculator: Triple Tax Advantage Online for Free: Step-by-Step Guide
See how an HSA grows over the years and how much tax it saves compared with a taxable account. Free, private and no sign-up.