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Percentage
Percentage Calculator
Calculate percentages three ways: X% of Y, X is what percent of Y, and X is Y% of what number — with the formula and steps.
Part = Percent ÷ 100 × Whole
Percentage Change Percentage Increase Reverse Percentage
Health
BMI Calculator
Body Mass Index from height and weight in metric or imperial units, with your category and healthy weight range.
BMI = weight (kg) ÷ height (m)²
Body Fat Ideal Weight Waist-to-Height Ratio
Finance
Loan Calculator
Calculate the monthly payment (EMI), total interest and full amortization schedule for any fixed-rate loan.
EMI = P·r·(1 + r)ⁿ / ((1 + r)ⁿ − 1)
Loan Amortization Personal Loan Home Loan
Loan & Mortgage
Mortgage Calculator
Full monthly mortgage cost including principal, interest, property tax, home insurance, PMI and HOA fees.
Monthly = P&I + tax/12 + insurance/12 + P…
Mortgage Payment House Affordability Down Payment
Finance
Compound Interest Calculator
See how money grows with compound interest — any compounding frequency, optional monthly deposits and a yearly breakdown.
A = P(1 + r/k)^(k·t)
Simple Interest APY Rule of 72
Birthday
Age Calculator
Exact age in years, months and days from a date of birth, with the next birthday countdown.
Count whole years, then months, then rema…
Age in Days Birthday Countdown Date Difference
GPA & Grade
GPA Calculator
Grade point average from course grades and credit hours on the 4.0 scale.
GPA = Σ (grade points × credits) ÷ Σ cred…
Cumulative GPA Weighted GPA GPA Goal
Basic Math
Scientific Calculator
Free online scientific calculator with trigonometry, logarithms, powers, roots, factorials, constants and degree/radian modes.
Functions: sin cos tan asin acos atan sin…
Basic Log Trigonometric Functions
Coordinate Geometry
Distance Between Two Points Calculator
Find the distance between two points (x₁, y₁) and (x₂, y₂) with the distance formula, step by step, in 2D or 3D.
d = √((x₂ − x₁)² + (y₂ − y₁)²)
Midpoint Slope Section Formula
Nutrition
Calorie Calculator
Daily calorie needs for maintenance, weight loss or gain from your body stats, activity level and goal.
Calories = BMR × activity factor + goal a…
TDEE Macro Calorie Deficit
Shopping & Retail
Tip Calculator
Calculate the tip and total bill, split between any number of people, with optional rounding up.
Tip = bill × %; each = (bill + tip) ÷ peo…
Split Bill Sales Tax Discount
Shopping & Retail
Discount Calculator
Sale price and savings after a percentage discount, with optional extra discount and sales tax.
Sale price = price × (1 − discount)
Double Discount Percentage Discount Original Price
Algebra
Quadratic Equation Calculator
Solve ax² + bx + c = 0 with the quadratic formula: real or complex roots, discriminant, vertex and factored form.
x = (−b ± √(b² − 4ac)) / 2a
Cubic Equation Factoring Polynomial
Statistics
Standard Deviation Calculator
Find the sample or population standard deviation, variance, mean and standard error of a data set with full working.
s = √(Σ(x − x̄)² / (n − 1))
Variance Mean Z-Score
Fraction
Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers. Get the simplified answer, mixed number and exact decimal.
a/b + c/d = (ad + bc)/bd
Fraction Simplifier Mixed Number Fraction to Decimal
Unit Converter
Unit Converter
Convert any unit — length, weight, volume, area, temperature, speed, pressure, energy, power, time, angle and data — in one place.
value → base unit → target unit
Length Converter Weight / Mass Converter Volume Converter

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15 categories · 173 tools

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