Free Online Calculators & Converters
119 free tools for developers, designers, students and professionals. Instant results, no signup.
CSS Unit Converters
8 tools
Developer Tools
9 tools
Color Converters
4 tools
Math & Science
40 tools
Education Tools
4 tools
Food & Nutrition
4 tools
Business & Finance
8 tools
Gaming Calculators
7 tools
Sports Calculators
3 tools
Fitness & Strength
5 tools
Construction Calculators
12 tools
Lifestyle & Astrology
3 tools
Home & Property
4 tools
Agriculture
1 tool
Unit Converters
7 tools
CSS Unit Converters
Convert between CSS units for responsive web design
PX to REM
Pixels to rem with adjustable base font size
REM to PX
Rem units back to pixels instantly
PX to EM
Pixels to em based on parent font size
EM to PX
Em units back to pixels instantly
PX to VW
Pixels to viewport width for fluid layouts
PX to VH
Pixels to viewport height for responsive designs
PX to Percent
Pixels to percentage relative to parent
PT to PX
Points to pixels for print-to-screen
Developer Tools
Code converters and utilities for programmers
CSS to Tailwind
Convert CSS to Tailwind utility classes
CSS to SCSS
Flat CSS to nested SCSS with variables
YAML to JSON
YAML and JSON bidirectional converter
CSV to SQL
CSV data to SQL INSERT statements
Chmod Calculator
Linux file permissions with interactive toggles
Base Converter
Binary, octal, decimal, hexadecimal
Bandwidth Calculator
Mbps to MBps and download time estimates
String Case Converter
camelCase, snake_case, kebab-case, PascalCase
Big O Calculator
Compare complexities, data structures & sorting cheat sheet
Color Converters
Convert between color formats for design and CSS
Math & Science
Calculators for physics, chemistry, calculus, and statistics
Partial Derivative Calculator
Partial derivatives with steps for any function
Combined Gas Law Calculator
PV=nRT, Boyle's, Charles's Law solver
Celsius to Fahrenheit
Temperature conversion with reference chart
Absolute Value Calculator
Solve |x|, equations & inequalities with steps
Radical Calculator
Simplify, multiply, divide & convert radicals
Interval of Convergence Calculator
Radius & interval of convergence with ratio test steps
Harvard Graphing Calculator
Plot multiple functions with analysis on HTML5 canvas
Mean Value Theorem Calculator
Find MVT 'c' values with step-by-step proof
Rectangular Prism Calculator
Volume, surface area, diagonals & 3D visualization
Standard Deviation Calculator
Sample & population SD with deviation table & steps
Inverse Laplace Calculator
L⁻¹{F(s)} with steps, table & partial fractions guide
Simplifying Calculator
Simplify fractions, radicals & expressions with steps
Newton's Method Calculator
Find roots with Newton-Raphson iteration & steps
Center of Mass Calculator
Point masses & standard shapes in 2D and 3D
Complex Number Calculator
Add, multiply, divide & find roots of complex numbers
Electron Configuration Calculator
All 118 elements with orbital diagrams & notation
Critical Numbers Calculator
Find critical points & classify max/min with steps
Recursive Formula Calculator
Generate sequence terms from recursive definitions
RREF Calculator
Reduced row echelon form with step-by-step Gauss-Jordan
Factoring Trinomials Calculator
Factor ax²+bx+c with AC method step-by-step
Factor by Grouping Calculator
Factor 4-term polynomials and trinomials by grouping
Significant Figures Calculator
Count sig figs and round to any number of sig figs
Unit Rate Calculator
Price per unit comparison and best value finder
Eigenvalue Calculator
2x2 eigenvalues, eigenvectors & characteristic polynomial
Fast Calculator
Clean instant online calculator with calculation history
Charles's Law Calculator
V1/T1 = V2/T2 gas law solver with unit conversions
Dilation Calculator
Scale factor, center & dilated coordinates with steps
Directional Derivative Calculator
Gradient, rate of change & max direction for functions
Trapezoid Calculator
Area, perimeter, midsegment & height with formulas
Parallelogram Calculator
Area, perimeter, diagonals & angles from sides or vertices
Fraction Exponent Calculator
Fractional powers with step-by-step radical conversion
Trinomial Calculator
Factor, expand, evaluate & find roots of trinomials
Sampling Distribution Calculator
Mean, standard error, z-score & probability for samples
Rounding Calculator
Round to decimal places, sig figs, fractions with 5 methods
Law of Sines Calculator
Solve triangles with AAS, ASA, SSA & ambiguous case
Law of Cosines Calculator
Solve SAS & SSS triangles with step-by-step work
Asymptote Calculator
Find vertical, horizontal & oblique asymptotes
Normal Distribution Calculator
Z-scores, probabilities & bell curve percentiles
Laplace Transform Calculator
Transform table, properties & inverse examples
Moment of Inertia Calculator
I-beam, rectangle, circle & mass moment of inertia
Education Tools
Grade calculators and academic tools for students
Easy Grade Calculator
Enter questions right/wrong and get your grade instantly
Class Grade Calculator
Weighted categories, letter grade & final exam needed
High School GPA Calculator
Weighted & unweighted GPA with AP, Honors & cumulative
Final Grade Calculator
Find what you need on the final exam to pass or get your target grade
Food & Nutrition
Calorie and macro calculators for popular restaurants
Business & Finance
Website cost, ROI, and traffic estimators
Website Cost Calculator
Exact website design cost with feature toggles
Website ROI Calculator
Return on investment and payback period
Website Traffic Calculator
Estimate traffic from SEO and paid ads
Gold Calculator
Scrap gold value by weight, karat & spot price
Bank Statement Converter
PDF text to CSV, Excel, QIF, OFX - no upload needed
PTO Calculator
Accrual tracking, balance projection & cash value
Gross Margin Calculator
Income statement with gross, EBIT & net margin
Dave Ramsey Retirement Calculator
15% rule, compound interest & 4% withdrawal for retirement
Gaming Calculators
Value calculators and tools for popular Roblox games
Grow a Garden Calculator
Plant values, mutations & pet weight for GAG Roblox
Point Buy Calculator
D&D 5e ability scores with 27-point buy system
Blox Fruit Calculator
Fruit values, trade helper & tier list for Blox Fruits
Nether Calculator
Overworld to Nether coordinate converter for Minecraft
Minecraft Stack Calculator
Items to stacks, storage planning & build presets
Schedule 1 Calculator
Product value, mixing multipliers & profit for Schedule I
Pokemon Catch Rate Calculator
Catch probability with all ball types & status conditions
Sports Calculators
Stats calculators for baseball, softball, and cricket
Fitness & Strength
Powerlifting calculators and fitness tracking tools
DOTS Calculator
Powerlifting DOTS score with age adjustment
RPE Calculator
Estimate 1RM from RPE, reps, and weight
Steps to Miles Calculator
Convert steps to distance, calories & time
TDEE Calculator
Total daily energy expenditure with BMR, macros & calorie targets
Creatine Water Calculator
Creatine dosage & water intake by body weight
Construction Calculators
Material estimators for roofing, siding, and building projects
Board and Batten Calculator
Boards, battens, furring strips & cost estimate
Rafter Calculator
Length, pitch, birdsmouth cuts & material count
Sand Calculator
Cubic yards, tons & bags needed for any project
Carpet Installation Cost Calculator
Material, labor & pad cost for any room or whole house
Glass Weight Calculator
Weight by glass type, shape, thickness & shelf load
Crushed Stone Calculator
Tons, cubic yards & bags for driveways, paths & drainage
Home Addition Cost Calculator
Estimate room addition cost by type, size & region
KW to Amps Calculator
Convert kilowatts to amps for single phase, 3-phase & DC
Conduit Fill Calculator
NEC code EMT, PVC, IMC, RMC wire fill checker
Brick Calculator
Bricks, mortar & sand needed for any wall project
Truss Calculator
Roof truss dimensions, loads & cost for 8 truss types
Window Installation Cost Calculator
Window replacement costs by type, frame & region
Lifestyle & Astrology
Astrology tools and lifestyle calculators
Home & Property
Cost estimators for home and yard projects
Tree Removal Cost Calculator
Estimate by size, species, condition & location
Price Per Square Foot Calculator
Home value, rent & commercial price per sq ft solver
Board Foot Calculator
Lumber & log board feet with 15 wood species pricing
Metal Roof Cost Calculator
9 materials, gauge options, labor rates & 30-year ROI
Agriculture
Yield estimators and farming calculators
Unit Converters
General purpose unit and format conversions
PX to CM Converter
Pixels to centimeters with adjustable DPI
CGPA to Percentage
CGPA to percentage using the x9.5 formula
Audiobook Speed Calculator
Adjusted listen time & hours saved at any playback speed
Japanese Name Converter
Convert English names to Japanese Katakana & Hiragana
Speech Time Calculator
Words to minutes with adjustable speaking pace
Gematria Calculator
Calculate gematria values across 9 cipher systems
Wind Chill Calculator
NWS wind chill with frostbite risk & clothing advice
New calculators added regularly. 119 tools and counting.