Everyday math,solved in seconds.
Free online calculators for everyday math: turn hourly pay into a salary, steps into miles and rooms into gallons of paint. Fast, accurate tools that show their work.
Most used this week
Popular free online calculators
What’s your hourly wage worth per year?
Type a rate and see it instantly. Based on a 40-hour week, 52 weeks a year.
Steps to Miles
Your steps, your height, your real distance.
Paint Calculator
Gallons and quarts for any room.
Dog Age
Human years by size, plus the DNA formula.
Days Between Dates
Days, weeks and business days.
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Browse free online calculators by category
The toolbox
All 234 free online calculators
Each tool has its own page with the formula, worked examples and FAQs, so you can see exactly how the answer was reached.
Health & Fitness
11 toolsSteps, calories, water and protein, sized to you.
Calories Burned Calculator
Calories burned for 32 activities by MET
TDEE Calculator
Daily calorie burn with cut and bulk targets
Conception Date Calculator
When conception likely happened
Army Body Fat Calculator
Army one-site tape test and age limits
Navy Body Fat Calculator
US Navy tape method body fat estimate
Lean Body Mass Calculator
LBM by Boer, James and Hume formulas
One Rep Max Calculator
Your 1RM from 7 formulas plus training loads
Waist to Height Ratio Calculator
Your ratio, NICE band and healthy waist range
Heart Rate Zone Calculator
Your 5 training zones in beats per minute
Macro Calculator
Protein, carbs and fat in grams for your goal
Calorie Deficit Calculator
Your daily calorie target and a realistic goal date
Pregnancy Week Calculator
Weeks and days pregnant on any date you choose
Ideal Weight Calculator
Healthy weight range for your height, kg or stone
BMR Calculator
Your resting calories with 3 trusted formulas
Target Heart Rate Calculator
Moderate and vigorous exercise heart rate
Calorie Calculator
Daily calories to maintain, lose or gain
Ovulation Calculator
Ovulation day, fertile window, next period
Pace Calculator
Running pace per mile and km, plus mph
Sleep Calculator
Best bedtime or wake-up time by sleep cycles
Body Fat Calculator
Body fat % with the U.S. Navy tape method
BMI Calculator
Body mass index and healthy weight range.
Due Date Calculator
Pregnancy due date and weeks pregnant.
Steps to Miles Calculator
Turn your step count into miles and kilometers.
Walking Calories Burned Calculator
Calories burned by weight, pace and time.
Water Intake Calculator
Your daily water goal in ounces and liters.
Protein Intake Calculator
Daily protein target for your weight and goal.
Money & Work
12 toolsTurn wages into salaries and work out what you owe.
SIP Calculator
Monthly SIP future value with step-up
EMI Calculator
Monthly EMI, total interest and yearly schedule
Gratuity Calculator
End of service gratuity for India and UAE
APY Calculator
Interest rate and compounding to APY
Markup Calculator
Cost and markup to price, profit and margin
Fuel Cost Calculator
Trip fuel cost from L/100 km or mpg, in EUR or GBP
Credit Card Payoff Calculator
Payoff time, interest and the cost of minimum payments
Car Loan Calculator
Monthly payment, interest and balloon in EUR, GBP or USD
Savings Goal Calculator
Monthly amount or time to goal, with interest and tax
Salary to Hourly Calculator
Hourly, daily, weekly and monthly pay from any salary
VAT Calculator
Add or remove VAT for the UK and all 27 EU states
Commission Calculator
Sales commission, tiered rates and total pay
Simple Interest Calculator
Interest from I = P × r × t
Loan Calculator
Monthly payment, total interest, payoff
Mortgage Calculator
Monthly payment with tax, insurance, HOA
Overtime Calculator
Time and a half and weekly pay
Profit Margin Calculator
Margin, markup and price from cost
Sales Tax Calculator
Add or remove sales tax from a price
Tip Calculator
Tip, total and split the bill per person.
Discount Calculator
Sale price, savings and stacked coupons.
Compound Interest Calculator
Grow savings with monthly deposits.
Hourly to Salary Calculator
Hourly wage to yearly, monthly and biweekly pay.
Zakat Calculator
Check the nisab and the Zakat you owe.
PTA Tax Calculator
PTA phone tax on passport or CNIC.
Date & Time
11 toolsCount days, add dates and total your hours.
Add Time Calculator
Add or subtract hours, minutes and seconds
Life Path Number Calculator
Numerology life path number with steps
Chinese Zodiac Calculator
Animal sign with real Lunar New Year dates
Zodiac Sign Calculator
Your star sign, element and modality
Time Duration Calculator
Hours and minutes between two times
Day of the Week Calculator
The weekday for any date, with the maths shown
Minutes to Hours Converter
Minutes as decimal hours and hh:mm
Time Zone Converter
Convert times between world time zones
Unix Timestamp Converter
Epoch time to date and back
Week Number Calculator
ISO week number for any date
Date Calculator
Add or subtract days, weeks, months
Hours Calculator
Hours between two times, minus breaks
Age Calculator
Exact age in years, months and days.
Days Between Dates Calculator
Days, weeks and business days between two dates.
90 Days From Today Calculator
The date 90 days from today, or from any date.
Time Card Calculator
Total weekly hours, overtime and pay.
Military Time Converter
Convert 24-hour time to AM/PM and back.
Hijri Date Converter
Convert Gregorian dates to Hijri and back.
Math & School
11 toolsPercentages, fractions, numerals and grades.
Decimal to Percent Converter
Decimal to percent and back, with ×100 working
Final Grade Calculator
Score you need on the final for your target grade
Weighted Average Calculator
Weighted mean of values with % or point weights
Percent Error Calculator
Percent, absolute and relative error
Mean Median Mode Calculator
Mean, median, mode, range and sum of a list
Significant Figures Calculator
Count sig figs and round to N significant figures
Binary to Decimal Converter
Binary, decimal, hex and octal, with working
Prime Factorization Calculator
Prime factors, factor tree and all divisors
Slope Calculator
Slope, y = mx + b, angle and distance from 2 points
Exponent Calculator
Any power: negative, fractional, huge numbers
Fraction to Decimal Converter
Exact decimals with the repeating block marked
Z-Score Calculator
Z-score, percentile and p-value on a normal curve
Scientific Notation Converter
Standard form, E notation and SI prefixes
Ratio Calculator
Simplify, solve, scale and share ratios
Circle Calculator
Area, circumference, diameter and radius
Pythagorean Theorem Calculator
Missing side, exact surd, angles and working
Rounding Calculator
Decimal places, sig figs and 8 rounding methods
GCF Calculator
Greatest common factor with four worked methods
LCM Calculator
Lowest common multiple with four worked methods
Square Root Calculator
Decimal, exact surd form and working in one place
Long Division Calculator
Quotient, remainder and every long division step
Grade Calculator
Final exam score needed and weighted grade
Percentage Calculator
Percent of, percent change and more
Standard Deviation Calculator
SD, variance and mean with steps
Random Number Generator
Random numbers in any range, no repeats
Average Calculator
Mean, median, mode and range
Fraction Calculator
Add, subtract, multiply, divide fractions
GPA Calculator
Semester and cumulative GPA on a 4.0 scale.
Percentage Increase Calculator
Percent change between any two numbers.
Decimal to Fraction Calculator
Decimals to simplest fractions, with steps.
Roman Numeral Converter
Numbers to Roman numerals and back.
CGPA to Percentage Calculator
CGPA to percentage on 4, 5 and 10 point scales.
Home & Building
5 toolsPaint, soil and gravel for your next project.
Board Foot Calculator
Board feet, lumber cost and volume
Topsoil Calculator
Topsoil in cubic yards, tons and bags
Stair Calculator
Steps, riser, tread and stringer from rise and run
Mulch Calculator
Mulch in cubic yards and 2 or 3 cu ft bags
Square Meter Calculator
Room area in m², ft² and yd² with cost
Brick Calculator
Bricks, mortar and cost for any wall
Wallpaper Calculator
Rolls needed with repeat, Euro or US rolls
Electricity Cost Calculator
Appliance running cost per hour, day, month and year
Flooring Calculator
m², packs and cost with waste for any floor
Concrete Calculator
m³, cubic yards and bags of premix for any slab
Gravel Calculator
Gravel in cubic yards, tons and tonnes
Square Footage Calculator
Area in sq ft, sq m, sq yd and total cost
Tile Calculator
Tiles and boxes for any floor or wall
BTU Calculator
Air conditioner size by room area
Paint Calculator
Gallons and quarts of paint for any room.
Cubic Yard Calculator
Cubic yards of soil, gravel, mulch or concrete.
Image Tools
4 toolsShrink photos for forms and fix aspect ratios.
Add Watermark to Photo
Put your name or logo text on photos
JPG to PDF Converter
Combine JPG and PNG images into one PDF
Image Resizer
Resize photos by pixels or percent
Image Color Picker
Tap any pixel for HEX, RGB and HSL
SVG to PNG Converter
SVG to PNG at 1x, 2x, 4x or any width
Resize Image to 30 KB
Photo or signature to a JPG under 30 KB
WebP Converter
Images to WebP and back, converted on your device
Resize Image to 200KB
Under 200 KB with the best quality that fits
PNG to JPG Converter
Batch convert PNG to JPG with quality control
JPG to PNG Converter
Batch convert JPG to PNG, transparent backgrounds
Image Compressor
Batch compress JPG, PNG and WebP with no upload
Resize Image to 10 KB
Shrink any photo to a JPG under 10 KB
Crop Image
Square, 16:9, 9:16 or any size, full resolution
Image Converter
JPG, PNG and WebP in any direction, 20 at once
Resize Image to 50KB
Compress any photo to under 50KB.
Resize Image to 100KB
Shrink images and scans to under 100KB.
Resize Image to 20KB
Shrink photos and signatures to 20KB.
Aspect Ratio Calculator
Find ratios and resize without stretching.
Text & Writing
6 toolsCount syllables, translate Morse and flip text.
QR Code Generator
Make QR codes for links, Wi-Fi and text
JSON Formatter
Beautify, minify and validate JSON
Username Generator
20 gamer, cute or pro username ideas
Random Word Generator
Random nouns, verbs and adjectives to copy
Invisible Character
Copy blank Unicode characters and spaces
Small Text Generator
Tiny superscript, subscript and small caps text
HEX to RGB Converter
HEX to RGB, RGBA and HSL, and back
UUID Generator
Random v4 and time ordered v7 UUIDs in bulk
URL Encoder Decoder
Percent encode or decode URLs and text
Bold Text Generator
Unicode bold in 6 styles with an accessibility check
Alphabetical Order Tool
Sort any list A to Z with real filing rules
Remove Duplicate Lines
Clean lists with case, space and sort options
Lorem Ipsum Generator
Paragraphs, words or exact characters, text or HTML
Character Counter
X, SMS, SEO, LinkedIn and Instagram limits in one go
Cursive Text Generator
Script and bold script letters to copy
Password Generator
Strong random passwords, 8 to 64 characters
Case Converter
UPPER, lower, Title, camel, snake, kebab
Word Counter
Words, characters and reading time.
Syllable Counter
Count syllables in words, lines and poems.
Morse Code Translator
Text to Morse code and back, with sound.
Upside Down Text Generator
Flip, mirror or reverse any text.
Pets
2 toolsYour dog's and cat's age in human years.
Aquarium Volume Calculator
Fish tank volume in liters and gallons
Cat Food Calculator
Daily cat calories and dry or wet food portions
Puppy Weight Calculator
Adult weight estimate and range by breed size
Dog Food Calculator
Grams and calories a day from the food label
Dog Age Calculator
Dog years to human years, by size.
Cat Age Calculator
Cat years to human years and life stage.
Unit Converters
8 toolsLand and gold units used in South Asia.
Height Converter: Feet to cm
Height in feet and inches to cm, and back
Stone to lbs Converter
Stone and pounds to lb and kg, and back
Watts to Amps Converter
Watts to amps for DC, AC and three phase
Square Feet to Square Meters Converter
Square feet to square meters and back
Ounces to Cups Converter
US and UK fluid ounces to cups and ml
Teaspoons to Tablespoons Converter
Tsp to tbsp with the exact spoons to use
Acres to Square Feet Converter
Acres to square feet, m² and hectares
Tablespoons to Cups Converter
Tbsp to cups with fractions like 3/4 cup
Grams to Cups Converter
25 ingredients, metric and US cups
Clothing Size Converter
UK, US, EU, France and Italy, plus shirt collars
MPH to KMH Converter
Exact 1.609344 factor, both ways, with speed limits
Grams to Ounces Converter
Exact ounces, troy ounces and pounds and ounces
Shoe Size Converter
UK, EU, US, foot length and Mondopoint
ML to Oz Converter
US and UK imperial fluid ounces side by side
MM to Inches Converter
Decimal, nearest fraction and the error in mm
Feet to Meters Converter
Exact 0.3048 factor, heights and square feet
Inches to CM Converter
Exact 2.54 factor, fractions and feet and inches
Cups to ml Converter
US, metric and UK cups to milliliters
Celsius to Fahrenheit Converter
Celsius, Fahrenheit and Kelvin both ways
Cm to Feet Converter
Height in cm to feet and inches
Kg to Lbs Converter
Kilograms to pounds, ounces and stones
Km to Miles Converter
Kilometers to miles and race distances
Liters to Gallons Converter
Liters to US or UK gallons, quarts, fl oz
Marla to Square Feet Converter
Marla to square feet by local standard.
Kanal to Marla Converter
Kanal to marla, square feet and acres.
Tola to Gram Converter
Tola to grams for gold and silver.
Guides
Quick answers, explained
Charts, formulas and worked examples, each paired with a free calculator.
How Many Weeks in a Year? 52 or 53, Plus Week Numbers and Paychecks
A year has 52 weeks and 1 day, or 52 weeks and 2 days in a leap year. That is…
How Many Pounds in a Kilogram? Exact Factor, Charts and Tricks
One kilogram equals about 2.20462 pounds, because a pound is defined as exactly 0.45359237 kilograms.
How to Calculate GPA: Semester, Cumulative and Weighted Steps
Multiply each grade point by its credit hours, add the results, then divide by total credits. A 15 credit term…
How Much Concrete Do I Need? Cubic Yards and Bags for Any Slab
A 10 by 10 foot slab 4 inches thick needs 1.23 cubic yards of concrete, or about 56 bags of…
Why ToolsVortex
Built to be the last tab you open
ToolsVortex brings together free online calculators for pay, health, home, dates, images and text. Every one of our free online calculators runs in your browser, so results are instant, accurate and private.
Why use free online calculators instead of a spreadsheet? Free online calculators are built for one job, so you get the right formula, clear steps and an instant answer without setting anything up. Our free online calculators cover pay and tax, health and fitness, home projects, dates and time, images and text, and every result explains how it was worked out.
Bookmark ToolsVortex and keep the most useful free online calculators one tap away on your phone or computer.
Private by design
Your numbers and photos are processed in your browser. Nothing is uploaded or stored.
Instant results
Answers update as you type. No loading screens, no waiting on a server.
Every answer explained
Formulas, charts and worked examples sit right under each tool.
Checked sources
We cite the CDC, the Department of Labor and other trusted sources where figures come from.
How it works
Three steps. No account.
Find your tool
Search, press Ctrl K anywhere, or browse by category.
Enter your numbers
Results appear as you type, with the working shown.
Use the answer
Copy it, download your file, or read the guide to go deeper.
FAQ
Free online calculators: questions people ask
Are the tools on ToolsVortex free?
Yes. Every tool is free with no sign-up, no watermark and no daily limit.
Do you upload my photos or data?
No. Our calculators and image tools run inside your browser, so the numbers, text and photos you enter are not sent to our server.
Do the tools work on my phone?
Yes. Every page is built for phones first and works in Chrome, Safari, Edge and Firefox on iPhone and Android.
How accurate are the results?
Each tool uses standard formulas and published figures, and the working is shown on the page. Results for pay, health and pets are estimates, so check important decisions with a professional.
Can I suggest a new tool?
Yes. Send your idea through our contact page. The most requested tools are built first.
Need a calculator we don’t have yet?
Tell us what you’re trying to figure out. The most requested ideas get built first.
Suggest a tool