Explore All Online Tools
Instant, private, and browser-based free online calculators, converters and screens. Whether you need a mortgage calculator, a BMI calculator, a percentage calculator, a standard deviation tool, square footage, temperature conversion, or a password generator everything here runs 100% in your browser with no sign-up.
Featured & Popular Tools
Basic Calculator
Standard arithmetic with high precision.
Scientific Calculator
Trig, logarithms, powers, and memory functions.
Loan Calculator
Monthly payments, total interest, loan terms.
Mortgage Calculator
Home mortgage payment with interest breakdown.
BMI Calculator
Body Mass Index for metric and imperial units.
Ohm's Law Calculator
Voltage, current, resistance, and electrical power.
GPA Calculator
Weighted and unweighted grade point averages.
Monitor & Dead Pixel Test
Fullscreen dead pixel check, color purity, contrast, & ghosting.
More Calculators & Converters
Percentage Calculator
Calculate percentages, percent change, proportions.
Fraction Calculator
Add, subtract, multiply, and simplify fractions.
Square Root Calculator
Square roots, cube roots, and nth roots instantly.
Average Calculator
Mean, median, mode, and range for datasets.
Standard Deviation
Population and sample variance and std dev.
Statistics Calculator
Comprehensive descriptive statistical analysis.
Quadratic Equation
Roots for ax² + bx + c = 0.
Triangle Calculator
Angles, sides, and area of any triangle.
Pythagorean Theorem
Hypotenuse and leg lengths for right triangles.
Exponent Calculator
Base powers, exponents, and scientific values.
LCM and GCD Calculator
Least Common Multiple and Greatest Common Divisor.
Random Number Generator
Generate random numbers in custom ranges.
Binary Converter
Binary, hex, octal, and decimal conversion.
Roman Numeral Converter
Roman numerals to Arabic numbers and vice versa.
Prime Factorization
Decompose any integer into prime factors.
Compound Interest
Investment growth with compound frequency.
Currency Converter
Exchange rate conversions across global currencies.
Savings Calculator
Future savings value with monthly deposits.
Tax Calculator
Income tax liabilities and net pay estimations.
Discount Calculator
Sale prices, percentage discounts, total savings.
Inflation Calculator
Purchasing power and real value change over time.
Retirement Calculator
Estimate 401k savings goals and retirement readiness.
Credit Card Payoff
Time and interest required to pay off debt.
Salary Calculator
Wages between annual, monthly, weekly, and hourly.
Auto Loan Calculator
Vehicle finance payments and total financing costs.
Investment Calculator
ROI and portfolio growth across time horizons.
Amortization Calculator
Loan amortization breakdown and principal repayment.
Interest Rate Calculator
Calculate implied annual interest rates and APR.
House Affordability
Max home purchase price based on income.
Debt Payoff Calculator
Accelerate debt payoff with extra contributions.
Calorie Calculator
Calculate BMR and daily TDEE energy requirements.
Body Fat Calculator
Body fat % using Navy circumference method.
Ideal Weight Calculator
Healthy weight ranges based on height formulas.
Pregnancy Due Date
Estimate baby arrival date from last menstrual period.
Age Calculator
Computes age in terms of years, months, weeks, days, hours, and seconds.
Sleep Calculator
Optimal bedtimes based on natural 90-min cycles.
Blood Alcohol (BAC)
Blood Alcohol Content based on Widmark formula.
Half-Life Calculator
Radioactive decay and remaining material over time.
Speed Calculator
Compute speed, distance, and travel time.
Area Calculator
Surface area for rectangles, circles, triangles.
Volume Calculator
3D volume for cubes, spheres, cylinders, cones.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin.
Weight Converter
Mass between kilograms, pounds, ounces, grams.
Length Converter
Distance between meters, feet, inches, miles.
Fuel Cost Calculator
Fuel consumption, travel costs, and efficiency.
Pace Calculator
Running pace, race splits, and target speed.
Concrete Calculator
Concrete slab volume, cubic yards, and bags needed.
Password Generator
Secure, customizable cryptographic passwords.
Typing Speed Test
Test your typing speed, WPM, and accuracy.
Date Difference
Days, weeks, months, years between two dates.
Time Calculator
Add and subtract hours, minutes, and seconds.
Tip Calculator
Tip amounts and split bill totals with friends.
Screen Resolution & DPI
Detect device pixel ratio, viewport size, aspect ratio, & DPI.
Refresh Rate & FPS Test
Measure monitor refresh rate (Hz), frame pacing, and FPS.