#1 Free Calculator Platform

All Your Calculators in One Place

Professional-grade calculators for home design, finance, education, and business. Fast, accurate, and completely free – trusted by thousands of users worldwide.

108+

Free Calculators

Why Choose thecalcs?

Built by professionals for professionals, students, and everyday users

Instant Results

Get accurate calculations in real-time without waiting or delays.

Completely Free

All calculators are 100% free with no hidden costs or subscriptions.

Professional Grade

Built using industry standards and professional formulas.

Always Available

Access your tools 24/7 from any device, anywhere in the world.

Most Popular Calculators

Start with our most-used tools, trusted by thousands

Math & Science

3.2k+ uses

Percentage Calculator

Calculate percentages, increases, decreases, and percentage relationships.

Try Calculator

Math & Science

2.5k+ uses

Quadratic Formula Calculator

Solve quadratic equations using the quadratic formula with discriminant analysis.

Try Calculator

Chemistry

2.1k+ uses

pH Calculator

Calculate pH, pOH, and ion concentrations from hydrogen or hydroxide ions.

Try Calculator

Calculus

2.1k+ uses

Derivative Calculator

Calculate derivatives, slopes, and analyze function behavior using calculus.

Try Calculator

Home Design

2.1k+ uses

TV Wall Mount Height Calculator

Find the perfect height to mount your TV for optimal viewing comfort.

Try Calculator

Arithmetic

2.0k+ uses

Nearest Tenth Calculator

Round numbers to the nearest tenth and other decimal places with analysis.

Try Calculator

Calculus

1.9k+ uses

Concavity Calculator

Analyze function concavity and find inflection points using second derivative.

Try Calculator

Arithmetic

1.9k+ uses

Round Calculator

Comprehensive rounding calculator for whole numbers, decimals, and custom places.

Try Calculator

Chemistry

1.8k+ uses

Mole Calculator

Calculate moles, mass, molecules, and concentration using Avogadro's number.

Try Calculator

Home Design

1.8k+ uses

Curtain Size Calculator

Calculate exact fabric requirements and measurements for window treatments.

Try Calculator

Physics

1.7k+ uses

Free Fall Calculator

Calculate motion under gravity using kinematic equations for physics.

Try Calculator

Physics

1.6k+ uses

Kinetic Energy Calculator

Calculate kinetic energy, mass, or velocity using the kinetic energy formula.

Try Calculator

View All 108+ Calculators

Calculator Categories

Organized collections of specialized tools for every need

Math & Science

95 tools

Advanced calculators for calculus, algebra, physics, chemistry, and statistics.

Explore

Finance & Housing

32 tools

Mortgage, loan, investment, retirement, and real estate calculators.

Explore

DIY, Outdoors & Hobbies

18 tools

Construction, landscaping, gardening, sports, and outdoor project calculators.

Explore

Home Services & Cost

16 tools

Cost estimation for tree removal, flooring, electrical, and home improvements.

Explore

Education & GPA

14 tools

GPA calculators, AP score predictors, and academic planning tools.

Explore

Programming

11 tools

Developer tools for JSON, regex, encoding, CSS, and web development.

Explore

Legal & Compliance

10 tools

Child support, court dates, legal deadlines, and compliance calculators.

Explore

Size & Spacing

6 tools

TV mounting, curtain sizing, lighting placement, and room design calculators.

Explore

Fitness & Lifestyle

6 tools

PTO, productivity, tithe, audiobook speed, and lifestyle calculators.

Explore

Payroll & Taxes

6 tools

State-specific paycheck and tax withholding calculators.

Explore

Recently Added

New Calculators

Check out our latest additions to the calculator collection

Calculus

Optimization Calculator

Find maximum and minimum values using calculus optimization with critical points.

Try Now

Trigonometry

Arcsin Calculator

Calculate inverse sine (arcsin) values in radians and degrees.

Try Now

Algebra

Function Table Calculator

Generate x-y tables for any function with custom range and step size.

Try Now

Algebra

Binomial Theorem Calculator

Expand binomial expressions using the binomial theorem with Pascal's triangle.

Try Now

Calculators for Every Need

From students to professionals, our tools serve diverse needs

For Students

Master math, science, and academics with step-by-step calculators for homework, test prep, and GPA tracking.

CalculusChemistryGPAAP Scores

For Homeowners

Plan home improvements, estimate costs, and design perfect spaces with professional-grade home calculators.

RenovationsDesignCost EstimatesDIY

For Professionals

Financial planning, business calculations, legal compliance, and professional development tools.

FinanceLegalDevelopmentBusiness

Need a Custom Calculator?

We build professional calculators for businesses, educators, and organizations. Get a custom solution tailored to your specific needs.

Get Custom Quote Learn More

Ready to Get Started?

Join thousands of users who trust thecalcs for accurate, professional calculations

Browse All Calculators