# Calcr Canonical origin: https://calcr.app Coverage: all currently published public pages in en. Languages without published site settings are excluded. Private pages, drafts and unpublished translations are excluded. Product index: https://calcr.app/llms.txt Detailed reference: https://calcr.app/llms-full.txt Sitemap: https://calcr.app/sitemap.xml ## en Calcr provides free online calculators with formulas, worked examples and clear results. Choose a calculator, enter your values and check its calculation rules. No account is needed. - [Free online calculator](https://calcr.app/) - [Free online calculators](https://calcr.app/tools): Find free online calculators for paychecks, mortgages, BMI, calories, math and dates. Check formulas and worked examples, with no account needed. - [Free browser games](https://calcr.app/games): Play free browser games with touch or keyboard controls. Open an available game directly or use a Code Mode shortcut. No downloads or accounts needed. - [Calculator guides & worked examples](https://calcr.app/blog): Learn how to calculate percentages, fractions, ratios, weighted grades and calendar dates. Follow formulas, worked examples and checks for each result. - [Scientific calculator](https://calcr.app/tools/scientific-calculator): Free scientific calculator for expressions, powers, roots and trigonometry. Choose degrees or radians, check worked examples and review calculation rules. - [Math calculators](https://calcr.app/categories/math): Work with expressions, percentages, fractions, ratios, averages and weighted grades using tools with clear formulas and examples. - [About Calcr](https://calcr.app/about): Calcr provides free calculators with visible rules and worked examples, plus a small collection of browser games for a break. - [How to calculate percentage change](https://calcr.app/blog/how-to-calculate-percentage-change): Use the original value as the base for percentage change. Work through increases, decreases, reverse changes and percentage points. - [Percentage calculator](https://calcr.app/tools/percentage-calculator): Free percentage calculator to find a percent of a number, a part as a percentage, an original total or percentage change. Check formulas and worked examples. - [Everyday calculators](https://calcr.app/categories/everyday): Calculate calendar age, date differences, clock durations and discounted prices with explicit counting and rounding conventions. - [Contact and report an issue](https://calcr.app/contact): Report a calculation error with the tool URL, sample inputs, expected answer and the rule you used. Avoid sharing private information. - [How to add and subtract fractions](https://calcr.app/blog/how-to-add-and-subtract-fractions): Find a common denominator, combine the numerators and simplify. Follow worked fraction and mixed-number examples without rounding. - [Fraction calculator](https://calcr.app/tools/fraction-calculator): Free fraction calculator to add, subtract, multiply and divide fractions or mixed numbers. Get a reduced exact answer, decimal result and worked examples. - [Finance calculators](https://calcr.app/categories/finance): Free finance calculators for US 2026 paycheck withholding, fixed-rate mortgages and monthly compound interest, with assumptions and worked examples. - [Privacy policy](https://calcr.app/privacy): Learn how Calcr handles local calculations, Cloudflare hosting, browser storage and optional Google Analytics after consent. Advertising remains off. - [How to simplify ratios and find a missing term](https://calcr.app/blog/how-to-simplify-ratios): Simplify ratios with a common divisor, align units before comparing, and use a proportion to scale a quantity or find a missing value. - [Ratio calculator](https://calcr.app/tools/ratio-calculator): Free ratio calculator to simplify ratios or solve a missing proportion. Use fractions or decimals, check units and follow examples for scaling and shares. - [Health calculators](https://calcr.app/categories/health): Free health calculators for adult BMI and maintenance calories. Review formulas, worked examples, applicable ages and limits before interpreting results. - [Terms of use](https://calcr.app/terms): Use Calcr’s free calculators and games responsibly. Understand the informational purpose of results, service limits and permitted access. - [How to calculate weighted grades](https://calcr.app/blog/how-to-calculate-weighted-grades): Convert scores to percentages, multiply by their course weights and add the contributions. Check weights and unfinished work before calculating. - [Average calculator](https://calcr.app/tools/average-calculator): Free average calculator for mean, median, sum, count, minimum and maximum. Enter a number list and learn when equal-weight averages can give a useful result. - [Cookies and browser storage](https://calcr.app/cookie): See which site functions use browser storage, how to clear local preferences and scores, and how optional consent controls affect advertising. - [How to calculate age between two dates](https://calcr.app/blog/how-to-calculate-age): Count completed calendar years, months and days, rather than dividing by 365. Understand Calcr’s leap-day and month-end convention. - [Grade calculator](https://calcr.app/tools/grade-calculator): Free grade calculator for weighted percentage scores. Check contributions and weights totaling 100%, compare exam scenarios and avoid common grading errors. - [Calculation methodology](https://calcr.app/pages/methodology): Review Calcr’s numerical precision, exact fractions, weighting rules, calendar conventions and the boundaries of each calculation. - [How to count days between dates](https://calcr.app/blog/how-to-count-days-between-dates): Distinguish elapsed days from inclusive date counts. Work through leap days, reversed ranges and date addition without time-zone assumptions. - [Age calculator](https://calcr.app/tools/age-calculator): Free age calculator to find completed years, months and days on a chosen date. Check birthday, leap-day and month-end examples with clear calendar rules. - [Limitations and disclaimer](https://calcr.app/pages/disclaimer): Calcr offers informational calculations from your inputs. Check rounding, calendar conventions and source rules before relying on a result. - [Date calculator](https://calcr.app/tools/date-calculator): Free date calculator to count days between dates or add years, months and days. Choose inclusive counting and check leap-year and month-end examples. - [Code Mode](https://calcr.app/code-mode): Use a public code to open a currently available Calcr game. Code Mode is optional and separate from ordinary numerical calculations. - [Time duration calculator](https://calcr.app/tools/time-duration-calculator): Free time duration calculator for hours, minutes and seconds between clock times. Choose an overnight interval and convert the result to decimal hours. - [Discount calculator](https://calcr.app/tools/discount-calculator): Free discount calculator for sale prices, stacked percentage discounts and optional sales tax. Compare savings, final prices and practical worked examples. - [Paycheck calculator](https://calcr.app/tools/paycheck-calculator): Free paycheck calculator for US 2026 federal withholding and employee FICA. Estimate pay per check, see the tax breakdown, and check year-to-date limits. - [2048](https://calcr.app/games/2048): Slide a four-by-four board, merge equal tiles and build toward 2048. Play a short browser puzzle with keyboard or touch controls. - [BMI calculator](https://calcr.app/tools/bmi-calculator): Free BMI calculator for adults age 20 and older. Use kg/cm or lb/in, see the adult screening category, and understand the limits of body mass index. - [Snake](https://calcr.app/games/snake): Guide a snake across a twenty-by-twenty board, collect food and avoid walls and its own body. Pause whenever you need a break. - [Calorie calculator](https://calcr.app/tools/calorie-calculator): Free calorie calculator for adult maintenance energy. Estimate resting calories and activity-adjusted kcal per day with clear formulas and limitations. - [Minesweeper](https://calcr.app/games/minesweeper): Reveal a nine-by-nine board containing ten mines. Use neighboring counts and flags, with a safe first reveal and a touch-friendly flag mode. - [Mortgage calculator](https://calcr.app/tools/mortgage-calculator): Free mortgage calculator for a fixed-rate loan. Estimate monthly principal and interest, add your property tax and insurance, and review total interest. - [Compound interest calculator](https://calcr.app/tools/compound-interest-calculator): Free compound interest calculator with monthly deposits. Compare a fixed-rate growth scenario, total contributions and interest, with explicit assumptions.