Expression calculator
Use +, −, *, x, ×, /, ÷ and parentheses. Press Enter to calculate.
Free online calculator
Calculate an expression or choose a tool for percentages, loans, dates and units. Each calculator explains its formula, shows an example and states its limits.
Loan Calculator with Amortization Schedule
Estimate fixed loan payments and inspect a month-by-month amortization schedule.
Loan Calculator with Amortization Schedule
Love Calculator by Name: Just for Fun
Enter two names to generate a fictional compatibility score.
Love Calculator by Name: Just for Fun
Rising Sign Calculation: Birth Time and Location
Understand the birth details and time conventions needed for a rising sign calculation, with clear limits on interpretation..
Rising Sign Calculation: Birth Time and LocationMath for everyday questions
Choose a tool, check the units and try its worked example.
Calculate sine, cosine, tangent, logarithms, powers and square roots.
Scientific Calculator: Trig, Logs and PowersCalculate an arithmetic or weighted mean, alongside the unweighted median, minimum and maximum.
Mean, Median and Weighted Average CalculatorFind a percentage of a number, calculate percentage change, recover an original total, or increase and decrease a value.
Percentage Calculator: Change, Increase and ReverseCalculate geometric volume and equivalent capacity for a box, cube, cylinder, sphere or cone.
Volume Calculator: Cubic Units and LitresCalculate the area of a rectangle, square, triangle, circle, ellipse or trapezoid, and the surface area of a sphere or closed cylinder.
Area Calculator: Shapes and Combined Floor AreasFind the principal, non-negative square root of a positive number or zero.
Square Root CalculatorOrganize a multi-step calculation and check the result using units, inverse operations and sensible rounding..
How to Check a Multi-Step Calculation
Adult BMI Calculator: Metric and Imperial
Calculate adult body mass index using metric or imperial measurements.
Adult BMI Calculator: Metric and Imperial
VAT Calculator: Add or Remove VAT
Add VAT to a net amount or remove VAT from a gross amount.
VAT Calculator: Add or Remove VAT
Check the relationship between net invoice value, VAT and gross total.
VAT Net and Gross: Invoice Calculation
Read averages, risk changes, samples and charts critically before accepting a numerical claim..
How to Read Statistics: Averages, Risk and Samples
Compare earnings, assets, debts and available cash using consistent periods and definitions..
Income vs Wealth: Comparing Earnings and Net Worth
Turn a word problem into an equation by identifying the requested quantity, reference value and measurement units..
How to Solve Math Word Problems
Learn practical mental arithmetic with decomposition, percentage shortcuts and rounding checks you can verify..
Mental Math Tricks with Worked Examples
Read scientific notation and distinguish millions, billions and trillions without confusing magnitude with precision..
Large Numbers and Scientific Notation
Understand pi, its approximate value and its use in circumference, area and volume calculations..
Pi: Value, Circle Formulas and Examples
Choose calculator capabilities for your task and check the exact device requirements before an exam..
How to Choose a Calculator for School or Work
Money, dates and everyday decisions
Choose a tool, check the units and try its worked example.
