Free tools for work, study & business
Calculators, converters, code formatters, text utilities, and web tools — all in one clean, premium interface. Trusted by US students, freelancers, and small businesses.
Instant results
Every tool is built for speed — most run entirely in your browser so you never wait on a server.
Private by design
We don't log your inputs or track what you paste. Zero accounts, zero data broker pipelines.
Works everywhere
iPhone, Android, tablet, laptop, desktop — every tool is mobile-first and fully responsive.
Built for US users
Dollars, inches, 4.0 GPA, AHA BP bands — defaults that match how America actually works.
The tools US users reach for most
Our highest-traffic, highest-rated tools. If you're new to BizNY, start here.
Percentage Calculator
Calculate percentages, increases, decreases, and more.
Open Percentage Calculator ∑BMI Calculator
Calculate Body Mass Index with category.
Open BMI Calculator ∑Age Calculator
Calculate exact age in years, months, and days.
Open Age Calculator ¶Word Counter
Count words, characters, sentences, reading time.
Open Word Counter ¶Password Generator
Strong, random, customizable passwords.
Open Password Generator { }JSON Beautifier
Format, prettify, and validate JSON.
Open JSON Beautifier ◉DNS Lookup Tool
Look up DNS records for any domain.
Open DNS Lookup Tool ∑Loan EMI Calculator
Calculate monthly loan payments and total interest.
Open Loan EMI Calculator ¶RGB to HEX Converter
Convert RGB values to HEX codes.
Open RGB to HEX Converter ∑Discount Calculator
Calculate sale prices, savings, and discount amounts.
Open Discount Calculator ◉Favicon Generator
Generate a multi-size favicon pack.
Open Favicon Generator ◉What Is My IP
See your public IP, location, and ISP.
Open What Is My IPConverters
23 toolsInstant, accurate base and encoding conversions — binary, octal, decimal, hex, ASCII, and text. All conversions run in your browser, so they're fast and private.
Text to Binary Converter
Convert any text into 8-bit binary code instantly.
Open ⇄Binary to Text Converter
Decode 8-bit binary sequences back into plain text.
Open ⇄Text to ASCII Converter
Convert any text string into ASCII decimal codes.
Open ⇄ASCII to Text Converter
Decode ASCII decimal codes into regular text.
Open ⇄Text to Hex Converter
Turn plain text into hexadecimal code.
Open ⇄Hex to Text Converter
Decode hexadecimal values into readable text.
Open ⇄ASCII to Hex Converter
Convert ASCII characters to hexadecimal.
Open ⇄Hex to ASCII Converter
Decode hex codes back into ASCII characters.
Open ⇄Decimal to ASCII Converter
Convert decimal numbers to ASCII characters.
Open ⇄ASCII to Decimal Converter
Convert ASCII characters to decimal values.
Open ⇄Text to Decimal Converter
Convert text into decimal character codes.
Open ⇄Octal to Binary Converter
Convert any octal number to its binary equivalent.
Open ⇄Octal to Decimal Converter
Convert octal (base-8) numbers to decimal (base-10).
Open ⇄Octal to Hex Converter
Convert octal numbers to hexadecimal form.
Open ⇄Binary to Octal Converter
Convert binary numbers to octal (base-8).
Open ⇄Decimal to Binary Converter
Convert decimal numbers to binary (base-2).
Open ⇄Binary to Decimal Converter
Convert binary (base-2) to decimal (base-10).
Open ⇄Hex to Decimal Converter
Convert hexadecimal (base-16) to decimal.
Open ⇄Decimal to Hex Converter
Convert decimal numbers to hexadecimal.
Open ⇄Binary to Hex Converter
Convert binary numbers to hexadecimal.
Open ⇄Hex to Binary Converter
Convert hexadecimal numbers to binary.
Open ⇄Decimal to Octal Converter
Convert decimal numbers to octal (base-8).
Open ⇄Hex to Octal Converter
Convert hexadecimal numbers to octal.
OpenCalculators
153 toolsA full library of finance, health, math, geometry, physics, and medical calculators — engineered with the formulas used by textbooks, industry references, and US standards.
Finance & Business (35)
Discount Calculator
Calculate sale prices, savings, and discount amounts.
Open ∑Tip Calculator
Calculate tips and split the bill easily.
Open ∑VAT Calculator
Add or remove VAT from any amount.
Open ∑GST Calculator
Calculate GST-inclusive and exclusive amounts.
Open ∑Sales Tax Calculator
Calculate US sales tax for any state.
Open ∑Loan EMI Calculator
Calculate monthly loan payments and total interest.
Open ∑Margin Calculator
Calculate profit margin, markup, and revenue.
Open ∑Percent Off Calculator
See how much you save on any percent-off deal.
Open ∑Triple Discount Calculator
Stack three percentage discounts in sequence.
Open ∑Stamp Duty Calculator
Estimate stamp duty on property transfers.
Open ∑Stamp Duty Calculator Australia
Estimate Australian stamp duty by state.
Open ∑Price Elasticity of Demand Calculator
Compute price elasticity of demand instantly.
Open ∑Annuity Depreciation Calculator
Depreciate assets using the annuity method.
Open ∑Car Depreciation Calculator
See how fast your car loses value each year.
Open ∑MACRS Depreciation Calculator
US tax depreciation under the MACRS system.
Open ∑Depreciation Comparison Calculator
Compare depreciation methods side by side.
Open ∑Percentage Depreciation Calculator
Depreciate assets by a fixed yearly percentage.
Open ∑Straight Line Depreciation Calculator
Straight-line depreciation with salvage value.
Open ∑Inflation Calculator
See how inflation erodes purchasing power.
Open ∑UK Inflation Calculator
Calculate the impact of UK inflation over time.
Open ∑Stock Profit Calculator
Calculate stock profit, loss, and ROI.
Open ∑WACC Calculator
Compute Weighted Average Cost of Capital.
Open ∑Debt to Asset Ratio Calculator
Calculate the debt-to-asset ratio.
Open ∑Earnings Per Share Calculator
Calculate Earnings Per Share (EPS).
Open ∑EBIT Calculator
Calculate Earnings Before Interest & Tax.
Open ∑EBITDA Calculator
Calculate EBITDA from net income and adjustments.
Open ∑Pre & Post-Money Valuation Calculator
Compute pre- and post-money startup valuation.
Open ∑Return on Assets Calculator
Calculate Return on Assets (ROA).
Open ∑ROCE Calculator
Calculate Return on Capital Employed.
Open ∑CPM Calculator
Calculate Cost Per Thousand impressions.
Open ∑CPC Calculator
Calculate cost-per-click for paid ads.
Open ∑Enterprise Value Calculator
Calculate enterprise value (EV) of a company.
Open ∑Market Capitalization Calculator
Calculate market capitalization of a stock.
Open ∑Ending Inventory Calculator
Calculate ending inventory for accounting.
Open ∑LTV Calculator
Calculate Loan-to-Value ratio.
OpenHealth & Fitness (22)
BMI Calculator
Calculate Body Mass Index with category.
Open ∑BMR Calculator
Estimate daily calorie burn at rest (BMR).
Open ∑Calorie Calculator
Daily calorie needs for any weight goal.
Open ∑Macro Calculator
Daily protein, carb, and fat targets.
Open ∑Weight Loss Calculator
Plan a calorie deficit to hit your goal weight.
Open ∑Ideal Body Weight Calculator
Estimate ideal body weight via clinical formulas.
Open ∑Lean Body Mass Calculator
Estimate lean body mass from weight and body fat.
Open ∑FFMI Calculator
Calculate Fat-Free Mass Index for lifters.
Open ∑BSA Calculator
Calculate Body Surface Area (BSA).
Open ∑BMI & BSA Calculator
Combined BMI + BSA clinical calculator.
Open ∑RMR Calculator
Calculate Resting Metabolic Rate.
Open ∑EER Calculator
Estimated Energy Requirement (IOM equation).
Open ∑McArdle BMR Calculator
BMR via the McArdle LBM-based formula.
Open ∑Meal Calorie Calculator
Split daily calories across meals.
Open ∑Army Body Fat Calculator
US Army circumference body fat formula.
Open ∑Navy Body Fat Calculator
US Navy circumference body fat method.
Open ∑Heart Rate Calculator
Target training heart rate zones.
Open ∑Maximum Heart Rate Calculator
Estimate maximum heart rate.
Open ∑Cardiovascular Risk Calculator
10-year cardiovascular risk estimate.
Open ∑ABV Calculator
Alcohol-by-volume for homebrewing.
Open ∑1RM Calculator
Estimate one-rep max from a submax set.
Open ∑Calorie Burn Calculator
Calories burned per exercise (MET).
OpenMedical Scoring (37)
Blood Type Calculator
Predict a child's blood type from parents.
Open ∑Depression Self-Test (PHQ-9)
PHQ-9 depression screening self-test.
Open ∑ANC Calculator
Absolute Neutrophil Count from WBC.
Open ∑ALC Calculator
Absolute Lymphocyte Count from WBC.
Open ∑QTc Calculator
Corrected QT interval on an ECG.
Open ∑Calcium Correction Calculator
Albumin-corrected serum calcium.
Open ∑Creatinine Clearance Calculator
Cockcroft-Gault creatinine clearance.
Open ∑Total Body Water Calculator
Total Body Water via Watson / Hume.
Open ∑Reticulocyte Count Calculator
Corrected reticulocyte count and index.
Open ∑LDL Calculator
LDL via Friedewald formula.
Open ∑Cholesterol Calculator
Cholesterol ratios for cardio risk.
Open ∑Bicarbonate Deficit Calculator
Bicarbonate deficit in metabolic acidosis.
Open ∑4AT Delirium Screening Score
4AT rapid delirium screening.
Open ∑6 Minute Walk Test Calculator
Predicted 6-minute walk distance.
Open ∑AMTS Calculator
Abbreviated Mental Test for cognition.
Open ∑ABCD2 Score for TIA
2-day stroke risk after TIA.
Open ∑ABC Score for Massive Transfusion
Predict massive transfusion in trauma.
Open ∑Acute Gout Diagnosis Calculator
Clinical prediction for acute gout.
Open ∑Adult ADHD Self-Report Scale
ASRS adult ADHD screening.
Open ∑AIMS65 Score Calculator
AIMS65 upper GI bleed mortality.
Open ∑ASPECT Score
ASPECT score for CT stroke.
Open ∑Alvarado Score for Appendicitis
Alvarado score for appendicitis.
Open ∑Asthma Control Test
5-item Asthma Control Test.
Open ∑AUDIT-C Alcohol Screening
AUDIT-C alcohol use screening.
Open ∑Bacterial Meningitis Score
Rule-out pediatric bacterial meningitis.
Open ∑BAP-65 Score for COPD
Acute COPD exacerbation mortality risk.
Open ∑Barthel Index Calculator
ADL functional status score.
Open ∑BISAP Score for Pancreatitis
Acute pancreatitis mortality score.
Open ∑Centor Score for Strep Pharyngitis
Strep pharyngitis probability.
Open ∑CHA₂DS₂-VASc Score
AFib stroke risk stratification.
Open ∑CHADS₂ Score
Legacy A-fib stroke risk score.
Open ∑Child-Pugh Score
Cirrhosis severity classification.
Open ∑CURB-65 Score
CAP severity with CURB-65.
Open ∑EGSYS Score for Syncope
Cardiac syncope prediction.
Open ∑4Ts Score for HIT
HIT pretest probability.
Open ∑Geriatric Depression Scale
15-item GDS depression screen.
Open ∑Blood Pressure Calculator
AHA-2017 BP category check.
OpenMath & Statistics (27)
Percentage Calculator
Calculate percentages, increases, decreases, and more.
Open ∑Log Calculator
Natural log, base-10, and any-base log.
Open ∑Antilog Calculator
Inverse logarithm in any base.
Open ∑Rounding Calculator
Round numbers to decimals or sig figs.
Open ∑Standard Deviation Calculator
Standard deviation, variance, and mean.
Open ∑Average Calculator
Mean, median, and mode of a list.
Open ∑Percent Error Calculator
Percent error for measurements.
Open ∑Percentage Increase Calculator
Calculate percent increase or decrease.
Open ∑Proportion Calculator
Solve a : b = c : x style proportions.
Open ∑Critical Value Calculator
Critical values for z, t, chi-sq, F.
Open ∑Margin of Error Calculator
Survey / sample margin of error.
Open ∑Poisson Distribution Calculator
Poisson PMF and CDF.
Open ∑Hypergeometric Calculator
Hypergeometric probability PMF.
Open ∑Confidence Interval Calculator
CIs for mean and proportion.
Open ∑Factorial Calculator
Compute n! for any integer n.
Open ∑Significant Figures Calculator
Round to N significant figures.
Open ∑Covariance Calculator
Covariance of two data sets.
Open ∑Modulo Calculator
Compute a mod b with big numbers.
Open ∑Remainder Calculator
Division remainder + quotient.
Open ∑Midpoint Calculator
Midpoint between two points.
Open ∑Cross Product Calculator
3D vector cross product.
Open ∑Arcsin Calculator
Inverse sine in degrees or radians.
Open ∑Arithmetic Sequence Calculator
Nth term + sum of arithmetic sequence.
Open ∑Binary Translator
Translate binary to/from text or decimal.
Open ∑Octal Calculator
Octal arithmetic in base-8.
Open ∑Hexadecimal Calculator
Add, sub, mul, div in hex.
Open ∑Binary Calculator
Base-2 addition, subtraction, multiplication, division.
OpenGeometry (17)
Slope Calculator
Slope m between two points.
Open ∑Circumference Calculator
Circle circumference.
Open ∑Circle Area Calculator
Area of a circle (πr²).
Open ∑Sector Area Calculator
Circular sector area.
Open ∑Ellipse Area Calculator
Ellipse area (πab).
Open ∑Rectangle Area Calculator
Rectangle area and perimeter.
Open ∑Parallelogram Area Calculator
Parallelogram area (b×h).
Open ∑Trapezoid Area Calculator
Trapezoid area ((a+b)/2 × h).
Open ∑Triangle Centroid Calculator
Centroid of a triangle.
Open ∑Pythagorean Theorem Calculator
Right-triangle a² + b² = c².
Open ∑Arc Length Calculator
Circle arc length.
Open ∑Cubic Meter Calculator
Cubic meters for cargo volume.
Open ∑Cylinder Volume Calculator
Cylinder volume (πr²h).
Open ∑Sphere Calculator
Sphere volume and surface area.
Open ∑Cone Volume Calculator
Cone volume ((1/3)πr²h).
Open ∑Board Foot Calculator
Lumber board-foot volume.
Open ∑Mulch Calculator
Cubic yards of mulch needed.
OpenPhysics & Engineering (5)
Everyday & Misc. (10)
GPA Calculator
Calculate your grade point average (US 4.0 scale).
Open ∑Bill Splitter
Split a bill fairly among any number of people.
Open ∑MPG Calculator
Calculate miles per gallon and fuel cost.
Open ∑Age Calculator
Calculate exact age in years, months, and days.
Open ∑Yu-Gi-Oh! Life Point Calculator
Track duel Life Points easily.
Open ∑ERA Calculator
Baseball earned run average.
Open ∑Days Between Dates Calculator
Exact days between two dates.
Open ∑Shoe Size Converter
Shoe sizes US/UK/EU/JP.
Open ∑Speed Converter
Speed conversion in any unit.
Open ∑US Tipping Guide
US tipping guide + calculator.
OpenCode Tools
16 toolsDeveloper-grade beautifiers, minifiers, and validators for JSON, HTML, CSS, JavaScript, XML, and PHP — with a clean, distraction-free interface.
JSON Beautifier
Format, prettify, and validate JSON.
Open { }JavaScript Minifier
Minify and compress JavaScript code.
Open { }CSS Beautifier
Format messy CSS with clean indentation.
Open { }HTML Beautifier
Format HTML with nested indentation.
Open { }JavaScript Beautifier
Format and indent JS code.
Open { }XML Beautifier
Format XML with proper indentation.
Open { }PHP Beautifier
Format PHP code cleanly.
Open { }CSS Minifier
Shrink CSS file size.
Open { }JSON Minifier
Strip whitespace from JSON.
Open { }HTML Viewer
Preview rendered HTML instantly.
Open { }Text Diff Checker
Line-by-line text/code comparison.
Open { }Text Compare
Highlight differences between two texts.
Open { }Grammar Checker
Basic grammar + spelling review.
Open { }Spell Checker
Catch spelling mistakes fast.
Open { }Readability Score
Flesch-Kincaid + reading level.
Open { }Credit Card Validator
Luhn-algorithm card number check.
OpenText Tools
14 toolsCount, compare, encode, and generate — the full text-handling toolbox for writers, marketers, and students.
Word Counter
Count words, characters, sentences, reading time.
Open ¶Character Counter
Character count, with and without spaces.
Open ¶Password Generator
Strong, random, customizable passwords.
Open ¶URL Encoder / Decoder
Percent-encode or decode URLs.
Open ¶Citation Generator
APA, MLA, Chicago style citations.
Open ¶Tiny Text Generator
Convert text to tiny Unicode characters.
Open ¶Small Caps Generator
Convert text to small caps Unicode.
Open ¶RGB to HEX Converter
Convert RGB values to HEX codes.
Open ¶Word Combiner
Mix word lists for name ideas.
Open ¶Line Counter
Count lines in any text block.
Open ¶Fake Address Generator
Random fake US addresses for testing.
Open ¶Article Rewriter
Thesaurus-style article rewriting.
Open ¶Paraphrasing Tool
Rewrite sentences with new words.
Open ¶Plagiarism Checker
Basic text-duplication check.
OpenWeb Tools
15 toolsDNS lookups, IP checks, broken-link scans, favicon generation — the webmaster essentials, all in one place.
DNS Lookup Tool
Look up DNS records for any domain.
Open ◉Domain IP Lookup
Find the IP address of any domain.
Open ◉What Is My IP
See your public IP, location, and ISP.
Open ◉Broken Links Checker
Scan a page for broken/dead links.
Open ◉Favicon Generator
Generate a multi-size favicon pack.
Open ◉ICO Converter
Convert PNG/JPG to .ico format.
Open ◉Image Cropper
Crop images in your browser.
Open ◉Server Status Checker
Check HTTP status codes for URLs.
Open ◉DNS Propagation Checker
Basic DNS propagation check.
Open ◉Bulk Domain Age Checker
Check age of multiple domains.
Open ◉Keyword Density Checker
Keyword density for SEO content.
Open ◉SEO Checker
Basic on-page SEO audit.
Open ◉Backlinks Maker
Free SEO ping-URL list.
Open ◉Image to Text (Basic)
Basic image-to-text OCR (coming soon).
Open ◉Reverse Image Search
Multi-engine reverse image search launcher.
OpenA premium toolbox, built in the USA
We're not a pop-up-laden SEO farm. BizNY is designed to be the tool directory you actually bookmark.
Every tool on BizNY is hand-engineered and reviewed for accuracy. Our calculators use textbook formulas — not black-box approximations — and our converters match the same reference implementations you'd find in programming language standard libraries. Where a tool is computationally sensitive (like medical scoring or financial depreciation), we match the original published formula and cite it on the tool's page.
We built BizNY because free tool sites have gotten worse: more ads, more pop-ups, more fake "premium" upsells for features that should be free. Our bet is that a clean, fast, US-audience-friendly toolbox is worth more than a dozen unusable clones. If you ever have a feature request or find a calculation that looks wrong, we read every message at support@bizny.co.
Questions about BizNY
Are BizNY tools really free?
Yes. All 200+ tools on BizNY are free to use with no sign-up, no subscription, and no usage cap. The site is supported by unobtrusive ads and sponsorships — not paywalls.
Do you store the data I enter?
No. Most BizNY tools run entirely in your browser, meaning your input never leaves your device. A small number of tools (like DNS Lookup or Broken Links Checker) run on our server, but we do not log or retain your queries.
Are BizNY tools suitable for business use?
Yes. BizNY is widely used by US small businesses, freelancers, accountants, marketers, and developers for daily calculations, code formatting, SEO checks, and content preparation.
How do you choose which tools to build?
We prioritize tools people actually search for — backed by search volume, community requests, and gap analysis against existing tool directories. If you have a tool idea, email hello@bizny.co.
Are the calculators accurate for US-based workflows?
Yes. Our calculators are designed for US defaults — dollars, imperial units, 4.0 GPA scale, AHA blood pressure categories, CDC BMI cutoffs, and so on — with metric toggles where it makes sense.
Bookmark BizNY — the toolbox you'll come back to
No accounts, no tracking, no upsells. Just 200+ fast, accurate, free tools — and new ones every month.
Browse the full library →