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Free Online Calculators

Fast, accurate calculators for percentages, interest, dates, health and everyday math, with formulas and worked examples.

Percentage

X% of Y CalculatorWhat Percent of X is Y?Percentage Change CalculatorCGPA to Percentage CalculatorView all 9 →

Interest & Loans

Compound Interest CalculatorSimple Interest CalculatorLoan Payment Calculator: Monthly Payment + Total InterestView all 3 →

Date & Time

Days Between Two DatesAge CalculatorBusiness Days CalculatorView all 3 →

Health

BMI Calculator (Metric)BMI Calculator for WomenBMI Calculator for MenBMI Calculator (Imperial)View all 13 →

Money

Tip CalculatorDiscount CalculatorSales Tax / VAT CalculatorCar Fuel Cost Calculator (Trip & Yearly)View all 5 →

Math

Average (Mean) CalculatorExponent Calculator: X^Y Instantly (Negative & Fractional)Binomial CDF Calculator (Cumulative Probability)45-45-90 Triangle CalculatorView all 4 →

Writing

Words to Pages Calculator400 Words to Pages: 1.6 Pages Double (0.8 Single)500 Words to Pages800 Words to Pages: 3.2 Pages Double (1.6 Single)View all 17 →

Pets

Dog Years to Human Years1 Dog Years to Human Years2 Dog Years to Human Years3 Dog Years to Human YearsView all 22 →

Electrical

Watts to Amps Calculator1500 Watts to Amps: 12.50 A at 120 V (6.25 A at 240 V)1000 Watts to Amps: 8.33 A at 120 V (4.17 A at 240 V)1800 Watts to Amps: 15.00 A at 120 V (7.50 A at 240 V)View all 21 →

Print & Screen

DPI to Pixels CalculatorInches to Pixels at 300 DPIMM to Pixels at 300 DPICM to Pixels at 300 DPIView all 4 →

Home

CFM CalculatorView all 1 →

Running

Pace CalculatorSwim Pace CalculatorBike Speed CalculatorRun Walk Pace Calculator (Galloway Method)View all 4 →

Construction

Steel Weight CalculatorSteel Plate Weight CalculatorView all 2 →

Cooking

Coffee to Water Ratio CalculatorCold Brew Coffee Ratio CalculatorFrench Press Coffee Ratio CalculatorView all 3 →

Walking

Steps to Miles CalculatorMiles to Steps CalculatorSteps to Kilometres CalculatorView all 3 →

Color & Code

Hex to RGB ConverterText to Binary ConverterPixels to Inches Converter, Exact at Any DPI (96/300)View all 3 →

Home & DIY

Paint CalculatorView all 1 →

Numbers

Significant Figures Calculator, Count & Round with RulesDecimal to Fraction CalculatorView all 2 →

Sleep

Sleep Calculator - Best Time to Go to BedSleep Cycle Calculator - How Many Cycles Will You Complete?Bedtime Calculator - What Time Should I Go to Bed?How Many Hours of Sleep Do I Need?View all 4 →

Reading and Speaking

Reading Time CalculatorSpeech Time CalculatorWords to Minutes CalculatorWords Per Minute Calculator - Test Your Reading SpeedView all 4 →

Percentile

Child BMI Percentile Calculator (CDC)Child Height Percentile Calculator (CDC)Child Weight Percentile Calculator (CDC)Baby Percentile Calculator (WHO: Weight, Length & Head)View all 5 →

Sports

Bicycle Tire Pressure CalculatorView all 1 →

Time

Time Average Calculator (Average of Times)View all 1 →

Cycle

Period Cycle Calculator (Next Period, Ovulation & Fertile Window)Period Date Calculator (When Is My Next Period Due)Period Cycle Length Calculator (Average From Past Periods)Period Calculator for Irregular Periods (Prediction Window)View all 7 →

Medical Billing

Global Period Calculator (CMS 0, 10 & 90 Day Surgical Package)View all 1 →

Paycheck

Texas Paycheck Calculator 2026: Take Home Pay After TaxesCalifornia Paycheck Calculator 2026: Take Home Pay After TaxesFlorida Paycheck Calculator 2026: Take Home Pay After TaxesNew York Paycheck Calculator 2026: Take Home Pay After TaxesView all 43 →

Building

Concrete Calculator, Cubic Yards and Bags NeededStair Calculator, Riser Height, Run and Stringer LengthGravel Calculator, Cubic Yards for a Driveway or PathSoil Calculator, Cubic Yards for a Garden Bed or Raised BedView all 12 →

Gaming

Mouse Sensitivity Converter Between GameseDPI Calculator, DPI × SensitivityFOV Calculator, Horizontal ↔ Vertical Field of ViewValorant Sensitivity Converter, To CS2, Apex, TF2, Overwatch 2View all 5 →

Selling

eBay Fee Calculator 2026: Final Value Fee and Your PayouteBay Profit Calculator: What You Actually Keep After FeesAmazon Referral Fee Calculator 2026: What Amazon Takes From a SaleAmazon Profit Calculator 2026: Real Margin After Referral and FBA FeesView all 4 →

Shipping

Dimensional Weight Calculator: UPS, FedEx and USPS ComparedLTL Freight Class Calculator: Density to NMFC Class (2025 Scale)Freight Cost Calculator: Air, Ocean LCL and LTL Chargeable WeightView all 3 →

Cloud

AWS S3 Cost Calculator: Storage, Requests and Data TransferView all 1 →

Business

Gross Margin Calculator: Margin, Markup and Required PriceMarkup Calculator: Set a Price From Cost, or Find Your MarkupSegment Pricing Calculator: Twilio Segment Cost by MTUZendesk Pricing Calculator: Cost per Agent and Total Monthly BillView all 14 →

Pace Charts

Marathon Pace ChartHalf Marathon Pace Chart5K Pace Chart10K Pace ChartPace calculator →

Fantasy Football

Fantasy Football Trade AnalyzerDynasty Trade Value ChartFantasy Football Trade Value ChartAnalyze a trade →