Calculators
Free calculators — 81 tools · 81 tools
One Rep Max Calculator
Estimate your one-rep max for strength lifts using standard formulas, and get training percentages
Age Calculator
Find your exact age in years, months, and days, plus days until your next birthday — instant and private
Amortization Calculator
See the full amortization schedule of a loan, payment by payment
BMI Calculator
Calculate your Body Mass Index and see your health category instantly — weight and height only, nothing leaves your browser
BMR Calculator
Calculate your basal metabolic rate and daily calorie needs for weight management
Body Fat Calculator
Estimate your body fat percentage and lean body mass from height and weight
CAGR Calculator
Compute the compound annual growth rate of an investment
Calcul
Collection of calculators. Matrix, unit converters, statistical distributions
Calculatoria
Online scientific calculator with progress saved locally
Calculator Soup
Hundreds of free online calculators for everyday math
Calendar Labs
Free printable calendar templates, date calculators, and holiday calendars
Timeanddate
Calendars, world clocks, countdowns, and date calculators
Calorie Burn Calculator
Estimate calories burned during a workout using the MET formula
Calorie Calculator
Estimate your daily calorie needs with BMR and TDEE using the Mifflin-St Jeor equation — entirely in your browser
Calorie Counter
Look up calories and nutrition for thousands of foods and track your daily intake
Cholesterol Levels
Understand cholesterol levels and healthy ranges
Circle Calculator
Calculate area, circumference, radius, and diameter of a circle
Compound Interest Calculator
Project how your savings and investments grow with compound interest and regular contributions
Concrete Calculator
Estimate how much concrete you need for a slab, footing, or column
Web AIM Contrast Checker
Check color contrast for WCAG compliance
Countdown Calculator
Count down to any target date in days, hours, minutes, and weeks
Cron Expression Builder
Parse cron expressions. Powered by cronstrue (MIT)
Cron Expression Generator
Build and validate cron expressions with a visual editor and next-run preview
Crontab Guru
The quick and simple editor for cron schedule expressions
Date Difference Calculator
Find the exact days, weeks, months, and years between any two dates with an instant in-browser calculator
Derivative Calculator
Compute derivatives with step-by-step solutions
Desmos Graphing Calculator
Explore math with a free online graphing calculator. Plot functions, create tables, add sliders, animate graphs
Discount Calculator
Calculate sale prices, discount amounts, and how much you save on any purchase
Domain Age Checker
Check when a domain was registered and its age
Due Date Calculator
Estimate your pregnancy due date, current week, and trimester from your last menstrual period
Time is
Exact time for any city, any timezone
Equation Solver
Solve linear and quadratic equations with steps
Ether Calc
Online collaborative spreadsheet editor. Export to Excel. No account needed
Free Dieting Calculators
Calorie, BMI, BMR, and macro calculators to plan nutrition and track weight goals
Fuel Cost Calculator
Estimate fuel used, trip cost, and cost per kilometer for any journey
Salary Calculator
Look up salary ranges for thousands of jobs and locations to negotiate with confidence
GPA Calculator
Compute your semester or cumulative GPA from course grades and credit hours
Grade Calculator
Calculate your current grade and what you need on the final
Hourly to Salary Converter
Convert an hourly wage to weekly, bi-weekly, monthly, and annual salary instantly in your browser
HTML Tools Suite
1,088+ pure front-end online tools. Single-file HTML, offline-ready, privacy-first. Covers Dev, Text, Time, Generators, Media, Calculators, Converters, Security
Integral Calculator
Compute definite and indefinite integrals with steps
IP Subnet Calculator
Compute network, broadcast, usable host range, and subnet mask from any IPv4 CIDR block — entirely in your browser
Loan Calculator
Calculate monthly payments, total paid, and total interest for any loan with an instant in-browser amortization calculator
Mathway
Solve math problems step-by-step from basic to calculus
Matrix Calculator
Perform matrix operations: multiply, inverse, determinant, and more
Maxima
Computer algebra system for symbolic and numerical computation
Mortgage Calculator
Estimate your monthly mortgage payment, total interest, and total cost of a home loan — entirely in your browser
GNU Octave
High-level language for numerical computation, largely compatible with MATLAB
OEIS Integer Sequences
The On-Line Encyclopedia of Integer Sequences. Explore mathematical patterns
Pace Calculator
Convert run time and distance into pace and speed for training plans and race predictions
Percentage Calculator
Quickly calculate percentages: percent of a number, percent change, and more
Percentage Change Calculator
Calculate the percentage increase or decrease between two values
Percentage Calculator
Calculate percentages, percent increase, and percent decrease instantly in your browser
Period Tracker
Track menstrual cycles and predict fertile windows
Photomath
Scan math problems with your camera to get step-by-step solutions
Desmos 3D
Graph 3D functions and surfaces interactively
Pregnancy Weight Calculator
Track recommended weight gain during pregnancy
Profit Margin Calculator
Calculate profit, profit margin, and markup from cost and selling price
Qalculate!
Powerful multi-purpose cross-platform calculator
Nerd Wallet Mortgage Calculator
Estimate mortgage payments and affordability
ROI Calculator
Calculate return on investment, annualized return, and profit
Sales Price Calculator
Calculate the final price after applying a discount and sales tax
Savings Goal Calculator
Find out how much to save each month to reach a savings goal
Scientific Calculator
Full scientific calculator with trigonometric, logarithmic, and statistical functions
Sleep Calculator
Find the best bedtime and wake time for complete sleep cycles
Stat Trek
Statistics calculators for probability, distributions, and tests
Symbolab
Advanced math solver with step-by-step solutions
Tax Calculator
Estimate income tax, deductions, and take-home pay for any salary
Test Grade Calculator
Convert a test score into a percentage and letter grade instantly
Time is
Displays the exact time in any time zone with milliseconds precision
Time and Date
World clocks, calendars, countdowns, and date calculators
Tip Calculator
Split tips and bills between friends instantly with per-person totals
Triangle Calculator
Solve triangles: angles, sides, area, and perimeter
VAT Calculator
Add or remove VAT from prices quickly for any rate
Walk Score
Measure walkability, transit, and bikeability of any address
Water Intake Calculator
Calculate your daily water intake recommendation
Week Number
Find the current week number and ISO week dates
Wolfram Alpha
Computational knowledge engine. Solve math, science, and data problems
Woo Rank
Instant SEO audit tool. Website review with global and local traffic rankings
Time is
Accurate time and timezone info for any city in the world
Xcas
Computer algebra system and calculator for symbolic and numeric math