General Calculators

Age Calculator

Calculate your exact age in years, months, weeks, days, hours and minutes.

Percentage Calculator

Calculate percentages, increases, decreases, and percentage differences.

Discount Calculator

Calculate discount amount, sale price, and savings from any percentage off.

Average Calculator

Calculate mean, median, mode, weighted average, and standard deviation.

Fraction Calculator

Add, subtract, multiply, divide fractions. Simplify and convert to decimals.

Random Number Generator

Generate cryptographically secure random numbers, lottery picks, dice rolls.

Scientific Calculator

Full scientific calculator with trig, logs, powers, factorial, and memory.

Dice Roller

Roll any combination of dice — d4, d6, d8, d10, d12, d20, d100 — with true randomness.

Standard Deviation Calculator

Calculate standard deviation, variance, and full statistics with step-by-step.

Days Until Calculator

Calculate how many days until any future date or event.

Matrix Calculator

Add, multiply, find determinant and inverse of matrices up to 4×4.

Quadratic Equation Solver

Solve any quadratic equation with full working, discriminant, and vertex.

Linear Regression Calculator

Calculate line of best fit, R², slope, and intercept from data points.

Confidence Interval Calculator

Calculate confidence intervals at 90%, 95%, or 99% from sample statistics.

Vector Calculator

Calculate dot product, cross product, magnitude, and angle between vectors.

Systems of Equations Solver

Solve 2×2 and 3×3 systems of linear equations with step-by-step methods.

Integral Calculator

Find antiderivatives and compute definite integrals with step-by-step rules.

Rent vs Buy Calculator

Compare 10-year cost of renting vs buying including opportunity cost and appreciation.

Moving Cost Estimator

Estimate moving costs by distance, home size, and service level.

Trip Cost Splitter

Split group trip expenses fairly and see who owes whom with minimum transactions.

Hourly vs Salary Calculator

Compare hourly and salary compensation including benefits, PTO, and total comp.

Cost of Living Calculator

Compare cost of living between cities and calculate salary needed to match.

Subscription Tracker & Calculator

Track all subscriptions and see total monthly, annual, and 5-year cost.

Cost of Living Comparison

Compare cost of living between cities with equivalent salary calculation.

Subscription Tracker & Calculator

Track all subscriptions, see total monthly/annual cost, and calculate investment alternative.

Percentage Change Calculator

Calculate the percentage increase or decrease between two numbers

Speed, Distance, Time Calculator

Solve for speed, distance or time given the other two values

Unit Price Calculator

Compare products by price per unit to find the best value

Tip Calculator

Calculate tip amount, total bill, and per-person split for any group size

Age Difference Calculator

Calculate the exact age difference between two people in years, months, and days

Ratio Calculator

Simplify ratios, scale ratios, find equivalents, and convert to percentages

Roman Numeral Converter

Convert numbers to Roman numerals and back

Probability Calculator

Calculate basic probability, combined events, binomial, and Bayes theorem

LCM & HCF Calculator

Find LCM and HCF/GCD of up to 6 numbers with step-by-step methods

Number Base Converter

Convert between binary, decimal, octal, hex, and any base (2-36)

Loan vs Buy Calculator

Compare buying cash vs taking a loan with true cost analysis

Electricity Bill Calculator

Calculate your electricity bill based on appliance usage and your unit rate

Chi-Square Test Calculator

Perform chi-square goodness of fit test with p-value and conclusion

Equation of a Line Calculator

Find slope-intercept, point-slope, and standard form from two points or point+slope

Number Sequence Finder

Detect patterns in number sequences and predict next terms

Event Budget Calculator

Estimate event costs for weddings, parties, and conferences by guest count

Pet Cost Calculator

Calculate lifetime cost of owning a pet by type, size, and age