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Free online calculators for math, finance, health, science and more. Get instant, accurate results with step-by-step explanations.
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Conversions
Unit, area, length, temperature and all conversions. Instant result with formula, examples and step-by-step calculation. Free online calculator.
246+ calculators
Specialized
Advanced calculators for finance, technology, agriculture, and more. Instant result with formula, examples and step-by-step calculation. Free online calculator.
373+ calculators
Mathematics
Fractions, algebra, geometry, statistics and more. Instant result with formula, examples and step-by-step calculation. Free online calculator.
414+ calculators
Advanced Finance & Business
Professional investment analysis, risk management, banking, insurance, crypto and more. Free tools with formula and steps.
209+ calculators
Financial
Loans, interest, investing, taxes and business tools. Instant result with formula, examples and step-by-step calculation. Free online calculator.
1019+ calculators
Marketing & Growth
Digital marketing ROI, PPC analysis, SEO value, growth metrics, SaaS KPIs, and funnel optimisation — every performance marketing calculation in one place.
80+ calculators
Construction Trades
Electrical (NEC 2023), plumbing, HVAC (ASHRAE 62.1), structural, carpentry, masonry, and finishing trade calculators for contractors and estimators.
70+ calculators
Practical
Time, health, construction, science and everyday tools. Instant result with formula, examples and step-by-step calculation. Free online calculator.
1482+ calculators
Entertainment & Lifestyle
Gaming, music, photography, and fashion calculators for creators, gamers, and enthusiasts.
122+ calculators
Logistics & Supply Chain
Freight, shipping, customs duty, inventory management, warehouse efficiency, and supply chain optimisation calculators for operations professionals.
95+ calculators
Sports Analytics
Advanced sports statistics and analytics calculators for cricket, football, baseball, basketball, soccer, and more. Free professional-grade tools.
118+ calculators
Creator Economy
YouTube revenue, TikTok earnings, Patreon income, sponsorship rates, engagement metrics, influencer pricing, and platform monetisation calculators.
70+ calculators
Life Events
Calculators for major life milestones — retirement, military service, weddings, and eldercare.
129+ calculators
Religion & Culture
Faith-based financial calculators and cultural event planners — Zakat, tithing, Hajj budgets, festival planning, and religious observance tools.
30+ calculators
Food & Cooking
Recipe tools, nutrition analysis, and diet planning calculators for home cooks and food enthusiasts.
76+ calculators
Home & Lifestyle
Home improvement, garden, education, parenting, and automotive calculators for everyday life.
112+ calculators
Popular Calculators
View allBasic Calculator
Standard arithmetic operations. Enter your values — see the result with formula, examples, and step-by-step working. Free.
Percentage Calculator
Calculate percentages, increases and decreases. Quick calculation with worked example and formula. Free everyday calculator.
Quadratic Formula
Solve any quadratic equation ax²+bx+c=0. Enter coefficients — get all roots via quadratic formula, completing the square, and factorisation. Free.
Tip Calculator
Calculate the tip amount for any restaurant bill. Enter the total and tip % — see tip per person, total including tip, and custom tip amounts. Free.
Discount Calculator
Calculate Discount quickly and accurately. Enter your values — see the result with the formula, worked example, and unit options. Free.
Mean Median Mode
Calculate mean, median, and mode of any dataset. Enter values — see all three averages, sorted data, frequency table, and range. Free.
Test Grade Calculator
Convert correct answers to percentage and letter grade. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.
Random Number Generator
Generate random numbers in any range with or without repetition. Enter min, max, and count — see your random numbers instantly. Free.
Grade Calculator
Calculate Grade quickly and accurately. Enter your values — see the result with the formula, worked example, and unit options. Free.
Matrix 2×2 Calculator
Determinant, inverse, addition and multiplication of 2×2 matrices. See formula, step-by-step solution and all rearrangements. Instant math solver.
Pythagorean Theorem
Apply the Pythagorean theorem to find any side of a right triangle. Enter two sides — get the missing side with proof shown. Free.
Trig Functions Calculator
Calculate trig function values for any angle. Enter degrees or radians — see sin, cos, tan, cot, sec, csc with unit circle position. Free.
All Calculators
From the Blog
Drake Equation Calculator: How Many Alien Civilizations Could Exist?
Calculate the number of detectable civilizations in our galaxy using the Drake Equation. Understand each variable, plug in your own estimates, and see how results change.
Your Weight on Other Planets: How Gravity Changes Everything
Calculate what you'd weigh on Mars, Jupiter, the Moon, and every planet. Understand the relationship between mass, radius, and surface gravity.
Schwarzschild Radius: How Big Is a Black Hole? Calculate the Event Horizon
Calculate the Schwarzschild radius — the event horizon size of a black hole for any mass. Understand what happens at the boundary and how mass determines a black hole's size.
How to Calculate Density: Formula, Examples, and Units
Calculate density from mass and volume using D = m/V, understand unit conversions between g/cm³ and kg/m³, and apply density to identify materials, predict buoyancy, and solve lab problems.
How to Calculate Pressure: Force, Area, and Pascal's Law
Calculate pressure from force and area using P = F/A, convert between PSI, Pa, bar, and atm, and apply Pascal's Law to hydraulic systems and fluid statics problems.
How to Calculate Velocity and Acceleration from Kinematics Equations
Calculate velocity, acceleration, and displacement using the four SUVAT kinematics equations, with worked examples for free fall, braking distance, and projectile motion.