Free Online Tools
You Actually Need
Simple, fast, and free โ no signup, no installs. Just open and use.
Stock Average
Average down calculator
Stock Return
P/L with fees Average down calculatorStock Average
Electricity Bill
kWh usage ร rate
AC Electricity Cost
BTU/watts to $/month
Heat Index
feels-like temperature
Discomfort Index
THI comfort score
EV Charging Cost
battery, kWh, rate
Fuel Cost Calculator
trip cost by distance & MPG
Star Sign Calculator
zodiac sign by birthday
New Year Countdown
time left until New Year
Lunar Calendar
Monthly calendar with lunar dates
Loan Calculator
Monthly payment and total interest
Age Calculator
Exact age in years, months, days from birth date
Compound Interest
Investment growth with monthly contributions
Discount Calculator
Sale price and discount percentage
Tip Calculator
Calculate tip and split the bill
Camping Food
Food per person
Food Quantity
Servings per person
Split the Bill
1/N with drinks
Percentage Calculator
Percentages, change, increase/decrease
Square Root & Log
Roots ยท powers ยท logs
Statistics Calculator
Mean ยท median ยท std. dev
Ratio Calculator
Proportions & splits
Prime Factorization
GCF ยท LCM ยท primes
Fraction Calculator
Add ยท subtract ยท simplify
D-Day Calculator
Countdown to date, days between dates
Savings Interest
After-tax payout
Week Number
What week is it
Day of Year
What day of the year
Workout Timer
Interval work/rest
Time Sum
Add time ranges
Shift Schedule
Next work day
Progress Rate
Percent done
Earned Value Rate
Cumulative payment rate
Annual Leave Calculator
Leave days by years of service
Business Days Calculator
Add business days, count working days
Wage Calculator
Hourly to daily, weekly, monthly, annual
Liters to Kg
water, oil, milk weight
Base Converter
Binary/Octal/Decimal/Hex
Bra Size Converter
US/UK/EU/Japan/Korea
Shoe Size Converter
US ยท EU ยท UK ยท mm chart
Jeans W/L Converter
waist & inseam inchโcm
Screw / Bolt Chart
metric M pitch, spanner, inch
Paper Size Converter
A4/B5/Letter mm & inch
Lunar Converter
Convert lunar and solar dates
Unit Converter
Length, weight, temp, speed, area, volume, data โ 300+
Case Converter
UPPERCASE, lowercase, Title Case
URL & Base64 Encoder/Decoder
Encode and decode strings
SVG to PNG
Vector to image
Favicon Maker
PNG to ICO
WebP to PNG
Keep transparency
PNG to WebP
Shrink file size
WebP to JPG
convert saved web images
JFIF to JPG
fix .jfif downloads
PNG to JPG
shrink file size
JPG to PNG
lossless conversion
AVIF to JPG
next-gen format fix
HEIC to PNG
lossless iPhone photos
JPG to WebP
optimize web images
Photo Mosaic
Pixelate by dragging
Merge Images
Combine vertically/horizontally
Watermark
Add text or logo watermark to photos
Favicon Generator
Create favicon.ico and PNG icons
All-in-One Image Tool
Resize + compress + convert in one
Image Resizer
Resize with aspect ratio lock
Image Compressor
Reduce file size with quality slider
Image Format Converter
JPG โ PNG โ WebP
HEIC to JPG
Convert iPhone/Galaxy HEIC photos
Metadata Viewer & Remover
View EXIF data, remove GPS & camera info
Metadata Editor (JPG)
Edit artist, copyright, date, camera info
Wheel Spinner
Random picker
2048 Game
tile merge puzzle
Loudness Challenge
Who can make the loudest sound?
Reaction Time Test
Measure your reflexes in ms
Click Speed Test
Clicks per second (CPS)
Aim Test
Click accuracy trainer
Memory Test
Sequence memory game
Schulte Table
Number order focus game
Color Discrimination Test
Spot the different color
Number Memory
How many digits can you recall?
Keyboard Tester
key press & ghosting
White Screen
full screen solid colors
Refresh Rate Test
check your Hz
Sound Level Meter
Measure noise in decibels (dB)
Antipode Calculator
Find the opposite side of Earth
Dead Pixel Test
Find faulty screen pixels
Stopwatch
Lap timer to hundredths of a second
Random Number
Generate random numbers in a range
QR Code Generator
Logo, colors, PNG/SVG download
Online Alarm & Timer
6 sounds, countdown timer
Time Calculator
What time X min/hours from now? 36 presets
My IP Address & Device Info
IP, browser, OS, screen info
Heat Index
NWS feels-like & chart
Discomfort Index
temperature-humidity
Baby Age Calculator
days, weeks, months, milestones
BMR Calculator
basal metabolic rate, calories
BMI Calculator
Body mass index from height and weight
Infant Height/Weight
Peer average by month
Height/Weight by Age
Korean average by age group
Due Date Calculator
Estimate due date from last period, trimester timeline
Ovulation Calculator
Estimate ovulation date and fertile window
JWT Decoder
decode token header/payload
JSON Formatter
Beautify, minify, validate JSON
UUID Generator
Random v4 unique identifiers
Timestamp Converter
Unix epoch to date and back
Color Converter
HEX, RGB, HSL conversion
Crontab Generator
Build cron expressions with presets and live preview
Regex Tester
Test regex with real-time match highlighting
AI Token Counter
GPT, Claude, Gemini tokens & cost
Contrast Checker
WCAG AA/AAA color contrast
Fishing Line Gauge
Gaugeยทdiameterยทlb
Sinker Weight
Gaugeโg (1ๅท=3.75g)
Split Shot Chart
Bยท2BยทG2 in grams
Lure Weight
ozโg converter
Hook Size Chart
By target fish
Reel Line Capacity
Meters per spool
Fish Weight
Weight by length/girth
Sashimi Yield
Fish weight โ servings
Minimum Size
Keep or release
Closed Season
No-take periods
Pesticide Dilution
Concentrate (mL) by ratio
Liquid Fertilizer
Dilution concentrate
JADAM Sulfur
Recipe & dilution (NaOH)
JADAM Wetting Agent
Recipe & dilution (KOH)
Microbe Solution
JMS ingredients
Mulch Film
Rolls by row length
Pesticide Amount
Total by area
Garden Twine
Rolls by row & lines
Fertilizer Rate
Actual kg from nutrient
Seed Calculator
Plants & seeds by spacing
Irrigation Calculator
Water volume & time
Lime Calculator
Lime kg by area
Livestock Feed
Feed kg by head
Farm Area Converter
Pyeong, majigi, ha
Planter Soil
Soil volume & bags
Seed Spacing
Seeds/plants needed
Tree Spacing
Trees per area
Sod Calculator
Rolls & pallets
Rain Barrel
Rainwater harvest
FAR & Coverage
building/floor area ratio
Wood Weight
timber weight by species
Site Photo Watermark
Stamp project info & GPS
Rebar Calculator
Weight & size chart
Wire Gauge (AWGโmmยฒ)
Conversion & ampacity chart
Wallpaper Calculator
Rolls needed
Flooring Calculator
Boxes & length
Board Feet Calculator
BF, mยณ, sai
Slope Calculator
Grade % & level
Concrete Calculator
Volume & ready-mix trucks
Mix Ratio
Concrete & mortar mixes
Paint Calculator
Liters & cans needed
Tile Calculator
Tiles & boxes needed
Brick Calculator
Masonry brick count
Pipe Sizing Calculator
Flow rate to pipe diameter with standard sizes
Area Calculator
Multi-zone area with material estimates
Volume Calculator
Volume with concrete & dump truck count
Material Calculator
Concrete mix, brick count, rebar weight
Metal Weight Calculator
Plate, tube, round bar by material
Air Conditioner Size
Cooling capacity W / BTU
Earthwork Calculator
Cut, fill, swell/shrink, truck loads
Drywall & Plywood
Sheets needed by area
Shadow Length
Sun altitude & noon shadow
Stair Calculator
Riser, tread, slope angle
Water Tank Volume
ใฅ, liters, tons
Construction Cost
Remodel estimate per pyeong
Rooftop Waterproofing
Urethane membrane
Bathroom Waterproofing
Cementitious
Epoxy Floor
Primer/middle/top
Silicone/Caulk
Tubes for joints
Mortar Quantity
Cement & sand
Self-Leveling
Bags by area
Formwork
Area by member
Insulation
Boards by area
US Tide Times
NOAA high & low tide for US coasts
Tide Times
High & low tide for Korean coasts
Altitude
Your current elevation (GPS)
Map Elevation
Click the map to get elevation
Temperature by Altitude
Summit temp estimate
Boiling Point by Altitude
High-altitude cooking
Time Until Sunset
Live countdown
Korea Sea Parting
14 tidal roads, open today
Jebudo Sea Parting
Live tidal road times
Jindo Sea Parting
์ ๋จ ์ง๋ ยท tidal road
Muchangpo Sea Parting
์ถฉ๋จ ๋ณด๋ น ยท tidal road
Seogeondo Sea Parting
์ ์ฃผ ์๊ทํฌ ยท tidal road
Silmido Sea Parting
์ธ์ฒ ์ค๊ตฌ ยท tidal road
Haseom Sea Parting
์ ๋ถ ๋ถ์ ยท tidal road
Soyado Sea Parting
์ธ์ฒ ์น์ง ยท tidal road
Somaemuldo Sea Parting
๊ฒฝ๋จ ํต์ ยท tidal road
Dongseom Sea Parting
๊ฒฝ๋จ ์ฐฝ์ ยท tidal road
Udo (Goheung) Sea Parting
์ ๋จ ๊ณ ํฅ ยท tidal road
Daeseom Sea Parting
์ ๋จ ํด๋จ ยท tidal road
Seonjaedo Sea Parting
์ธ์ฒ ์น์ง ยท tidal road
Nueseom Sea Parting
๊ฒฝ๊ธฐ ์์ฐ ยท tidal road
Sangjangdo Sea Parting
์ ๋จ ์ฌ์ ยท tidal road
Time Until Sunrise
Live countdown
Annual Day Length
Day/night by month
Sunlight Calculator
When sunlight enters your window
Sunrise & Sunset
Times, direction, golden hour, live sun position
ND Filter Calculator
Long exposure shutter & stops
Moonrise & Moonset
Times, direction, moon phase, live position
Bubble Level
Check level with phone sensor (mobile)
Compass
Find direction with phone sensor (mobile)