Calculators
Free Online Calculators
Use practical browser-based calculators for math, finance, everyday tasks, education, dates, electrical formulas, and clearly framed health references.
Math
Percentage Calculator
Calculate percentages, percentage change, and increases or decreases.
Basic Calculator
Perform addition, subtraction, multiplication, division, powers, and remainders.
Statistics Calculator
Find mean, median, mode, range, variance, standard deviation, and common means.
Fraction Calculator
Add, subtract, multiply, divide, simplify, and convert exact fractions.
Ratio Calculator
Simplify ratios, solve proportions exactly, and split totals by ratio.
Scientific Calculator
Use trigonometry, logarithms, roots, powers, factorials, and other scientific operations.
LCM & GCF Calculator
Find the greatest common factor and least common multiple of multiple whole integers.
Quadratic Equation Solver
Solve ax squared plus bx plus c equals zero and inspect roots, discriminant, and vertex.
Binary / Octal / Decimal / Hex Calculator
Perform exact whole-number arithmetic in base 2, 8, 10, or 16.
Random Number Generator
Generate one or many random integers or decimal values inside a chosen range.
Finance
Loan / EMI Calculator
Estimate monthly payments, total interest, payoff time, and the effect of extra payments.
Interest Calculator
Compare simple and compound interest, APY, and recurring contribution growth.
Profit Margin Calculator
Calculate profit, margin, markup, revenue, and cost from unit economics.
Discount Calculator
Calculate sale price and savings from an original price and percentage discount.
VAT / Tax Calculator
Add percentage tax to a net amount or extract included tax from a gross amount.
Everyday
Education
Date & Time
Age Calculator
Calculate calendar age plus total days, weeks, and hours between a birth date and an as-of date.
Date Difference Calculator
Measure calendar and total-day differences between two dates in either order.
Countdown Calculator
Count down from the current browser time to a future local date and time.
Time Duration Calculator
Find elapsed time between two local date-time values across hours or multiple days.
Electrical & Physics
Health
BMI Calculator
Calculate adult body mass index from weight and height with a standard screening range label.
BMR & Daily Calorie Needs Calculator
Estimate adult basal metabolic rate and a rough activity-adjusted daily energy need.
Ideal Weight Formula Comparison
Compare several historical adult height-based reference-weight formulas.