Math & Geometry
63 calculatorsPythagorean Theorem Calculator
Solve for any side of a right triangle using the Pythagorean theorem a² + b² = c². Enter two sides to find the third.
Long Division Calculator
Perform long division with step-by-step solutions showing quotient, remainder, and decimal result.
Scientific Notation Calculator
Convert numbers to and from scientific notation. Add, subtract, multiply, and divide in scientific notation with steps.
Limit Calculator
Find the limit of any mathematical function as x approaches a value. Supports one-sided limits, limits at infinity, and approach tables.
Rounding Calculator
Round numbers to any decimal place or significant figure using standard, floor, ceiling, or banker's rounding methods.
Simplify Fractions Calculator
Reduce any fraction to its lowest terms. Shows GCD, step-by-step work, mixed number, decimal, and percentage conversions.
Finance & Business
28 calculatorsGold Calculator
Calculate the value of your gold by weight, karat purity, and current market price.
Investment Calculator
Calculate future value of investments with compound interest, monthly contributions, and year-by-year growth breakdowns.
Paycheck Calculator
Estimate your take-home pay after federal and state taxes, Social Security, Medicare, and other deductions.
Discount Calculator
Calculate sale price, discount amount, and savings percentage with support for stacking discounts and sales tax.
Margin Calculator
Calculate profit margin, gross margin, and markup percentage from cost and selling price.
Salary Calculator
Convert your salary between hourly, daily, weekly, biweekly, semi-monthly, monthly, and annual pay periods instantly.
Health & Fitness
34 calculatorsA1C Calculator
Convert your A1C (HbA1c) to estimated average blood sugar (eAG) in mg/dL or mmol/L.
Chronological Age Calculator
Calculate your exact chronological age in years, months, days, weeks, and hours from your date of birth.
FFMI Calculator
Calculate your Fat-Free Mass Index (FFMI) to measure muscularity and compare to natural limits.
BAC Calculator
Estimate your blood alcohol content (BAC) based on drinks consumed, body weight, gender, and time elapsed.
BMI Calculator
Calculate your Body Mass Index (BMI) using your height and weight. See your BMI category and healthy weight range.
Calorie Calculator
Calculate your daily calorie needs based on age, gender, weight, height, and activity level using the Mifflin-St Jeor equation.
Education & Testing
12 calculatorsGrade Calculator
Calculate your weighted grade average or find out what score you need on your final exam.
GPA Calculator
Calculate your semester and cumulative GPA on a 4.0 scale by entering courses, grades, and credit hours.
SAT Score Calculator
Estimate your SAT score from raw section scores and see your composite total.
APUSH Score Calculator
Estimate your AP US History exam score from multiple choice and free response section results.
Grade Curve Calculator
Apply square root, bell, and linear curve methods to raw scores and instantly see your curved grade.
Big O Calculator
Calculate time complexity and Big O notation for algorithms and code.
Construction & Trade
33 calculatorsSquare Foot Calculator
Calculate area in square feet for rectangles, circles, triangles, and trapezoids. Convert between sq ft, sq yd, sq m, and acres.
Roofing Calculator
Estimate roofing squares, shingle bundles, and materials needed for your roof with pitch factor and waste allowance.
Concrete Calculator
Calculate how much concrete you need in cubic yards and bags for slabs, columns, walls, and footings.
Gravel Calculator
Estimate how many cubic yards and tons of gravel you need for driveways, landscaping, pathways, and other projects.
Mulch Calculator
Calculate how much mulch you need in cubic yards and bags for your landscaping project.
Asphalt Calculator
Estimate tons of asphalt needed for driveways, roads, and parking lots based on area dimensions and thickness.
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