All Free Calculators

Every free online calculator you need, organized by category. Updated for 2025-26 tax rates and medical formulas. No account required.

Payroll & Tax Construction & Materials Health & Fitness Finance & Investment Education & GPA Math & Science Food & Cooking Specialty & Other

Payroll & Tax

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Illinois Paycheck Calculator
Take-home pay after Illinois state and federal t…
Federal Income Tax Rate Calculator
Find your effective federal tax rate and margina…
Ohio Paycheck Calculator
Estimate your Ohio net pay after state and feder…
Self-Employment Tax Calculator
Calculate SE tax owed and the deductible half fo…
Prorated Rent Calculator
Calculate the exact partial-month rent for any m…
Time and a Half Calculator
Calculate overtime pay at 1.5x your regular hour…
Washington State Paycheck Calculator
No state income tax in WA - see your full federa…
Pennsylvania Paycheck Calculator
PA flat 3.07% state tax - calculate your net pay…
Michigan Paycheck Calculator
Calculate Michigan take-home pay with the 4.25% …
Maryland Paycheck Calculator
Estimate Maryland net pay including state tax an…
New York Paycheck Calculator
Calculate New York state and NYC local tax take-…
Virginia Paycheck Calculator
Figure out your Virginia net pay after state inc…
Wisconsin Paycheck Calculator
Calculate Wisconsin take-home pay using 2025-26 …
Arizona Paycheck Calculator
Estimate Arizona net pay with the 2.5% flat stat…
Minnesota Paycheck Calculator
Calculate Minnesota take-home pay across four st…
Nevada Paycheck Calculator
No state income tax in Nevada - calculate federa…
Utah Paycheck Calculator
Calculate Utah net pay with the 4.65% flat state…
Reverse Sales Tax Calculator
Back-calculate the pre-tax price from any receip…
North Carolina Paycheck Calculator
Estimate NC take-home pay with the 4.5% flat sta…
Oklahoma Paycheck Calculator
Calculate Oklahoma net pay after state and feder…
Massachusetts Paycheck Calculator
Estimate Massachusetts take-home pay with the 5%…
Iowa Paycheck Calculator
Calculate Iowa net pay after state income tax an…
Kentucky Paycheck Calculator
Estimate Kentucky take-home pay with the 4.0% fl…
South Carolina Paycheck Calculator
Calculate South Carolina net pay using the gradu…
Tennessee Paycheck Calculator
No wage income tax in Tennessee - calculate your…
Washington DC Paycheck Calculator
Calculate DC take-home pay with District of Colu…
Idaho Paycheck Calculator
Estimate Idaho net pay after the 5.8% flat state…
Arkansas Paycheck Calculator
Calculate Arkansas take-home pay using 2025-26 s…
Kansas Paycheck Calculator
Estimate Kansas net pay after state and federal …
Colorado Paycheck Calculator
Calculate Colorado take-home pay with the 4.4% f…
Georgia Paycheck Calculator
Estimate Georgia net pay after state income tax …
Florida Paycheck Calculator
No state income tax in Florida - see your full f…
Texas Paycheck Calculator
No state income tax in Texas - calculate exact f…
California Paycheck Calculator
Calculate California take-home pay including sta…
West Virginia Paycheck Calculator
Estimate West Virginia net pay after state incom…
Maine Paycheck Calculator
Calculate Maine take-home pay using graduated st…
Hawaii Paycheck Calculator
Estimate Hawaii net pay with some of the highest…
Nebraska Paycheck Calculator
Calculate Nebraska take-home pay using current s…
Mississippi Paycheck Calculator
Estimate Mississippi net pay after the 4.7% flat…
Montana Paycheck Calculator
Calculate Montana take-home pay using current st…
Rhode Island Paycheck Calculator
Estimate Rhode Island net pay after state and fe…
New Mexico Paycheck Calculator
Calculate New Mexico take-home pay with graduate…
Delaware Paycheck Calculator
Estimate Delaware net pay after state income tax…
South Dakota Paycheck Calculator
No state income tax in South Dakota - see your f…
Alaska Paycheck Calculator
No state income tax in Alaska - calculate your f…
Connecticut Paycheck Calculator
Calculate Connecticut take-home pay using 2025-2…
Vermont Paycheck Calculator
Estimate Vermont net pay after graduated state i…
Wyoming Paycheck Calculator
No state income tax in Wyoming - calculate your …
New Hampshire Paycheck Calculator
No wage income tax in New Hampshire - estimate y…
North Dakota Paycheck Calculator
Calculate North Dakota take-home pay with the 2.…

Construction & Materials

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Square Footage Calculator
Calculate area in square feet for rooms, yards, …
Asphalt Calculator
Calculate tons of asphalt needed for driveways, …
Roof Pitch Calculator
Find roof slope, pitch angle, and rafter length …
Bitumen Calculator
Calculate bitumen quantity needed for road surfa…
Board Feet Calculator
Calculate board feet of lumber from thickness, w…
Conduit Fill Calculator
Check NEC conduit fill percentage for any condui…
Drywall Calculator
Calculate how many sheets of drywall you need fo…
Quikrete Calculator
Calculate bags of Quikrete or concrete mix for p…
Dirt Fill Calculator
Calculate cubic yards of fill dirt or excavation…
Stone and Rock Calculator
Calculate tons of stone, gravel, or rock needed …
Topsoil Calculator
Calculate cubic yards of topsoil needed for your…
Pool Volume Calculator
Calculate swimming pool volume in gallons for re…
Concrete Bag Calculator
Figure out how many bags of concrete you need fo…
Sand Calculator
Calculate bags or tons of sand needed for any ar…
Wallpaper Calculator
Calculate rolls of wallpaper needed for any room…
Pea Gravel Calculator
Calculate bags or tons of pea gravel or river ro…
Flooring Calculator
Calculate square footage of flooring needed incl…
Plywood Calculator
Calculate sheets of plywood needed for subfloor,…
Electrical Conduit Fill Calculator
Verify NEC code compliance for wire fill in elec…
Rock Mass Rating Calculator
Calculate RMR score for tunnel and slope stabili…
Wood Fence Calculator
Estimate lumber, pickets, and posts needed for a…

Health & Fitness

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Period Calculator
Predict your next period and track your menstrua…
Chronological Age Calculator
Calculate your exact age in years, months, and d…
Starbucks Calorie Calculator
Find the calorie count for any Starbucks drink o…
A1C Calculator
Convert average blood glucose levels to an estim…
ABV Calculator
Calculate alcohol by volume (ABV) for homebrew b…
Corrected Calcium Calculator
Calculate albumin-corrected serum calcium from l…
FFMI Calculator
Calculate Fat-Free Mass Index to assess muscle d…
Baby Percentile Calculator
Check your baby's weight, height, and head circu…
Puppy Weight Calculator
Predict your puppy's adult weight based on breed…
VO2 Max Calculator
Estimate your aerobic capacity and cardiorespira…
Anion Gap Calculator
Calculate serum anion gap to help diagnose metab…
APFT Body Fat Calculator
Calculate body fat percentage using the US Army …
Blood Alcohol Content Calculator
Estimate your BAC based on number of drinks, bod…
Dog Weight Calculator
Determine whether your dog is at a healthy weigh…
Peptide Dosage Calculator
Calculate peptide dose in mcg from vial concentr…
Power to Weight Ratio Calculator
Calculate your power-to-weight ratio in watts pe…
McDonald's Calorie Calculator
Look up the calorie and nutrition information fo…
Panda Express Calorie Calculator
Find calories and nutrition data for Panda Expre…
Cava Calorie Calculator
Build your Cava bowl and get the full calorie an…
Dog Pregnancy Calculator
Estimate your dog's due date and pregnancy miles…
Cattle Gestation Calculator
Calculate the expected calving date based on the…
Bike Calories Calculator
Estimate calories burned cycling based on speed,…

Finance & Investment

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Reverse Mortgage Calculator
Estimate how much you can receive from a reverse…
Coast FIRE Calculator
Find when your investments will coast to your re…
FERS Retirement Calculator
Calculate your federal pension annuity benefit u…
Cap Rate Calculator
Calculate capitalization rate for rental propert…
Commercial Mortgage Calculator
Estimate monthly payments and total interest for…
Silver and Scrap Metal Calculator
Calculate the melt value of silver coins, bars, …
IRR Calculator
Calculate internal rate of return for any series…
Debt Snowball Calculator
Map out a debt payoff plan using the snowball me…
401k Calculator with Match
Project your 401(k) balance over time including …
Commercial Real Estate Loan Calculator
Calculate loan payments, amortization, and total…
CD Interest Rate Calculator
Calculate how much interest a certificate of dep…
DSCR Loan Calculator
Calculate debt service coverage ratio to qualify…
Mobile Home Loan Calculator
Estimate monthly payments for manufactured home …
How Long Will My Savings Last
Calculate how long a lump sum will last with reg…
Dividend DRIP Calculator
Model dividend reinvestment growth over time wit…
FERS Supplement Calculator
Estimate your FERS Special Retirement Supplement…
Mortgage Calculator by State
Estimate your monthly mortgage payment with stat…
Roth IRA Contribution Calculator
Check your Roth IRA contribution limit based on …
Roth vs Traditional 401k Calculator
Compare Roth and traditional 401k after-tax outc…
Barista FIRE Calculator
Find your Barista FIRE number for semi-retiremen…

Education & GPA

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Math & Science

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Food & Cooking

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Specialty & Other

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Frequently Asked Questions

Questions about our free online calculators.

CalculatorFlux currently offers 160+ free calculators across 8 categories: payroll and tax, finance and investment, health and fitness, construction and materials, education and GPA, math and science, food and cooking, and specialty tools. New calculators are added regularly.