Free online calculators for everyday answers
AI Calculator is a collection of practical tools for math, finance, science, school, dates, home projects, and everyday planning. Open the calculator you need and get a direct result without signing in.
Always free
No account wall or paywall on calculator pages.
Direct answers
Each page is built around one concrete calculation task.
Practical coverage
Core pages focus on schoolwork, money, science, home projects, and daily math.
Browse calculator categories
Start with a topic, then jump into a dedicated calculator.
Basic Math
Fast calculators for percentages, rounding, unit rates, LCM, GCD, and long division.
Geometry
Calculate circle, triangle, coordinate, and volume problems with clear formulas.
Statistics
Probability, significance, normal distribution, standard deviation, and measurement-error calculators.
Linear Algebra
Matrix and vector calculators for dot products, determinants, eigenvalues, RREF, and cross products.
Finance
Investment, dividends, margin, military housing, discount, and money planning calculators.
Shopping
Compare deals, discounts, unit rates, tips, and real purchase totals.
Home & Construction
Estimate material volumes, project costs, TV mounting height, and home planning measurements.
Education
Student-focused calculators for GPA, AP scores, study checks, and academic planning.
Popular calculators
A cross-section from the full calculator directory.
Volume Calculator
Calculate volume of rectangular objects with multiple units.
Significant Figures Calculator
Calculate significant figures with mathematical expressions.
Circumference Calculator
Calculate circle circumference using radius or diameter.
Percentage Calculator
Calculate percentage of a number, percentage change, and common percent problems.
Discount Calculator
Calculate sale prices, percentage off, and savings.
Gravel Calculator
Estimate gravel volume, cubic yards, weight, and material cost.
TV Wall Mount Height Calculator
Calculate optimal TV mounting height.
Standard Deviation Calculator
Calculate population and sample standard deviation, variance, and mean.
RREF Calculator
Reduce matrices to row reduced echelon form with Gauss-Jordan steps.