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Free Online Calculators

Every calculator you need in one place — finance, business, percentages, dates, health, math, everyday life and construction — each with the formula behind the answer. Free, no sign-up, and the maths runs in your browser.

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Finance
Loans, mortgages, interest, savings, and debt calculators.
15 calculators →
Business
Pricing, margin, tax, and revenue calculators for business use.
9 calculators →
Percentage
Percentage math: increase, decrease, change, and reverse calculations.
9 calculators →
Date & Time
Date differences, work hours, timesheets, and countdowns.
10 calculators →
Health
BMI, calories, macros, and body composition calculators.
9 calculators →
Math
General-purpose math tools: fractions, ratios, roots, statistics.
15 calculators →
Everyday
Tips, fuel cost, grades, sleep, and other everyday utilities.
12 calculators →
Construction
Material and area estimators for construction and home projects.
9 calculators →
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Start with a quick calculation

Calculate now, then go deeper.

Use the basic calculator for everyday arithmetic, or search our specialist calculators for percentages, loans, dates, health, business, construction and more.

Looking for a specialist tool? Use the search above or browse the categories below.

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Top calculators

The calculators people reach for most, across every category. See all 88 →

Mortgage CalculatorEstimate your monthly mortgage payment, total interest, and full amortization schedule based on home price, down payment, rate, and term.Percentage CalculatorWork out any percentage of a number (what is X% of Y?) and see the value with that percentage added or subtracted.Age CalculatorCalculate exact age in years, months, and days from a birth date, plus total days and weeks lived.BMI CalculatorCalculate Body Mass Index (BMI) from height and weight, in metric or imperial units, with weight category.GPA CalculatorCalculate your Grade Point Average (GPA) from a list of letter grades and credit hours.Work Hours CalculatorCalculate total hours worked in a shift, accounting for a clock-in time, clock-out time, and unpaid break.Concrete CalculatorCalculate how much concrete you need in cubic yards, plus the number of premixed bags required.Tip CalculatorCalculate the tip amount, total bill, and per-person cost for any bill amount and tip percentage.Compound Interest CalculatorSee how your money grows with compound interest over time, with a year-by-year balance breakdown.Loan CalculatorCalculate the monthly payment, total interest, and payoff schedule for any fixed-rate installment loan.Calorie CalculatorCalculate your daily calorie needs based on age, weight, height, activity level, and weight goal.Days Between Dates CalculatorCalculate the exact number of days between two calendar dates.
More than an answer

Understand the calculation, not just the result.

CalculatorAnything combines practical calculators with formulas, worked examples, assumptions, limitations and clear explanations. Our goal is to help you understand what a result means and how it was calculated—not simply show a number.

Use the tools for quick everyday answers or explore the explanation beneath each calculator when you want to understand the method. We organize related calculators into focused categories so it is easier to move from one calculation to the next. Examples use realistic values and show the reasoning behind the result where that adds value. CalculatorAnything is designed to stay fast and straightforward on desktop and mobile, with no account required.

Clear formulas

See the method behind calculations where a formula applies.

Worked examples

Follow realistic examples to understand each step.

Useful context

Learn assumptions, limitations and how to interpret the result.

Free, no account

No account required. Calculations run in your browser and your inputs are not sent to us.

Frequently asked questions

What can I calculate on CalculatorAnything?

You can use 88 calculators across finance, business, percentages, dates and time, health, math, everyday tasks and construction. Each category links to specialist tools for common calculations.

Are the calculators free?

Yes. CalculatorAnything calculators are free to use and do not require an account.

How are calculator results explained?

Where appropriate, calculator pages explain the formula or method, provide a worked example, describe assumptions and limitations, and link to related calculations.

Can I use the results for professional decisions?

The calculators are designed for informational and estimation purposes. Financial, health, legal or other professional decisions may require advice or verification appropriate to your situation.