Online Calculators

Basic Calculator

Perform arithmetic calculations online — addition, subtraction, multiplication, division, and more.

Scientific Calculator

Advanced scientific calculator with powers, roots, logarithms, trigonometry, and constants.

Percentage Calculator

Calculate percentages, percent change, discounts, markups, and tips instantly.

Unit Converter

Convert length, weight, volume, temperature, area, speed, time, data, and more.

Date Difference Calculator

Find the number of days, weeks, months, or business days between two dates.

Loan Calculator

Calculate monthly loan payments, total interest, and amortization schedule.

Mortgage Calculator

Estimate monthly mortgage payments including taxes, insurance, PMI, and HOA fees.

Compound Interest Calculator

Estimate investment growth with compound interest, contributions, and year-by-year breakdown.

Paycheck Calculator

Estimate take-home pay after federal taxes, Social Security, Medicare, and deductions.

ROI Calculator

Calculate return on investment, net profit, and annualized ROI for any investment.

Break-Even Calculator

Find the break-even point — how many units or how much revenue covers your costs.

BMI Calculator

Calculate Body Mass Index (BMI) using height and weight in US or metric units.

GPA Calculator

Calculate semester and cumulative GPA from your course grades and credit hours.

Statistics Calculator

Calculate mean, median, mode, standard deviation, variance, and quartiles for a data set.

Electrical Calculator

Calculate voltage, current, resistance, power using Ohm's Law and electricity cost.

Construction Calculator

Estimate area, concrete volume, paint, and flooring materials for construction projects.