Math Tools
Calculators and math utilities
Fuel Cost Calculator
Estimate fuel volume and trip cost for US miles and mpg or metric km and liters per 100 km.
Electricity Cost Calculator
Estimate kWh and daily to yearly cost from wattage, hours per day, and price per kWh.
Percentage Calculator
Calculate percentages: X% of Y, X is what % of Y, and percentage change.
BMI Calculator
Calculate your Body Mass Index with metric or imperial units.
Compound Interest Calculator
Calculate compound interest with customizable principal, rate, frequency, and time.
Age Calculator
Calculate your exact age in years, months, days, and more from your date of birth.
Date Calculator
Calculate days between two dates or add/subtract days from a date.
Loan Calculator
Calculate monthly payments, total interest, and view a full amortization schedule.
Calorie Calculator
Estimate daily calorie needs based on age, gender, weight, height, and activity level.
Tip Calculator
Calculate tips and split bills evenly between any number of people.
Salary Calculator
Convert between annual, monthly, weekly, and hourly pay using your work schedule.
ROI Calculator
Compute return on investment, annualized return, and profit or loss over time.
Discount Calculator
Find the sale price and savings from an original price and discount percentage.
Markup Calculator
Calculate selling price and margin from cost and markup, or reverse-engineer from prices.
Sales Tax Calculator
Add sales tax to a pre-tax amount with common US rate presets.
Savings Goal Calculator
Estimate how many months to reach a savings goal with contributions and interest.
Break-Even Calculator
Find break-even units and revenue from fixed costs, variable cost, and price.
Inflation Calculator
See future nominal amounts, purchasing power, and a year-by-year inflation table.
Scientific Calculator
Full-featured calculator with trigonometry, logarithms, powers, and memory.
GPA Calculator
Calculate weighted GPA on a 4.0 scale from letter grades and credit hours.
Standard Deviation Calculator
Calculate mean, median, mode, variance, and standard deviation from a data set.
Fraction Calculator
Add, subtract, multiply, and divide fractions with automatic simplification.
Quadratic Equation Solver
Solve axยฒ + bx + c = 0 with real or complex roots, vertex, and axis of symmetry.
Average Calculator
Calculate arithmetic, weighted, geometric, and harmonic means from a set of numbers.