🧰 ToolDeck

Free Online Calculators & Converters

28 fast, private tools for percentages, loans, health, units, dates and text. No sign-up, no downloads — everything runs right in your browser.

Try Percentage CalculatorBrowse all tools

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Math & Percentages

Percentage, discount, VAT, tip and everyday math calculators.

Percentage CalculatorPercentage Change CalculatorDiscount CalculatorVAT / Sales Tax Calculator+4 more
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Finance

Loan payments, interest, savings and salary calculators.

Loan / Mortgage Payment CalculatorCompound Interest CalculatorSimple Interest CalculatorSalary to Hourly Calculator
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Health & Fitness

BMI, calories, body fat and hydration calculators.

BMI CalculatorBMR & Calorie CalculatorBody Fat Calculator (Navy Method)Daily Water Intake Calculator+1 more
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Unit Converters

Length, weight, temperature, speed, volume and data size converters.

Length ConverterWeight & Mass ConverterTemperature ConverterSpeed Converter+2 more
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Date & Time

Age, date difference and other date-time tools.

Age CalculatorDate Difference Calculator
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Text & Design

Word counter, password generator, aspect ratio and more.

Word CounterPassword GeneratorAspect Ratio Calculator

All 28 Tools

Percentage Calculator
Free percentage calculator: find X% of a number, what percent X is of …
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Percentage Change Calculator
Calculate percentage increase or decrease between two values. See the …
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Discount Calculator
Calculate the final price after a discount. Enter price and percent of…
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VAT / Sales Tax Calculator
Add or remove VAT (sales tax) from any price. Supports 5%, 10%, 20% an…
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Tip Calculator
Calculate the tip on any bill and split it between friends. Supports 1…
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Average Calculator (Mean, Median, Mode)
Calculate the average (mean), median, mode, range and sum of any list …
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Ratio Calculator
Simplify ratios, solve for the missing value in a proportion (A:B = C:…
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Random Number Generator
Generate random numbers in any range. Perfect for lotteries, raffles, …
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Loan / Mortgage Payment Calculator
Calculate monthly loan or mortgage payments, total interest and total …
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Compound Interest Calculator
See how savings grow with compound interest. Supports monthly contribu…
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Simple Interest Calculator
Calculate simple interest on a principal: I = P × r × t. Total amount …
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Salary to Hourly Calculator
Convert annual salary to hourly, weekly and monthly pay — or the other…
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BMI Calculator
Calculate your Body Mass Index in metric or imperial units. See your B…
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BMR & Calorie Calculator
Calculate your Basal Metabolic Rate and daily calorie needs with the M…
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Body Fat Calculator (Navy Method)
Estimate body fat percentage with the US Navy circumference method. En…
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Daily Water Intake Calculator
Calculate how much water you should drink daily based on weight and ac…
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Ideal Weight Calculator
Estimate your ideal body weight with the Devine, Robinson, Miller and …
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Length Converter
Convert length and distance units instantly: mm, cm, m, km, inches, fe…
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Weight & Mass Converter
Convert weight and mass units: grams, kilograms, ounces, pounds, stone…
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Temperature Converter
Convert Celsius to Fahrenheit, Fahrenheit to Celsius and Kelvin instan…
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Speed Converter
Convert speed units: km/h, mph, m/s, ft/s and knots. Running, driving …
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Volume Converter
Convert volume units: milliliters, liters, cups, pints, quarts, gallon…
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Data Size Converter
Convert digital storage units: bytes, KB, MB, GB, TB and KiB/MiB/GiB. …
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Age Calculator
Calculate your exact age from your date of birth — in years, months, d…
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Date Difference Calculator
Find the number of days, weeks, months and years between two dates. Co…
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Word Counter
Count words, characters (with and without spaces), sentences, paragrap…
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Password Generator
Generate strong random passwords with custom length, symbols, numbers …
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Aspect Ratio Calculator
Calculate aspect ratios, missing dimensions for images and video (16:9…
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Free Online Calculators & Converters

ToolDeck gives you 28 free online tools in one place: percentage and discount calculators, loan and compound interest projections, BMI and calorie calculators, unit converters for length, weight, temperature, speed, volume and data sizes, date calculators, word counters and a secure password generator. Every tool runs entirely in your browser — instant results, nothing uploaded, no account needed. Bookmark ToolDeck and never hunt for a formula again.