मुफ़्त ऑनलाइन टूल
268+ free online tools for PDF, images, SEO, developers, color, and productivity. Fast, browser-based, and private — no signup, no installs, no limits. Search above or browse by category below.
Total tools26810.7K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
Probability Calculator
Calculate basic, complement, union, intersection, conditional, and binomial probabilities with formulas and step-by-step work.
Used 0 times•Updated never
Combinations Calculator
Calculate combinations nCr and permutations nPr with factorial formulas, step-by-step work, and support for large results.
Used 0 times•Updated never
Permutations Calculator
Calculate permutations nPr and factorials n! for ordered arrangements with formulas and step-by-step work.
Used 0 times•Updated never
Statistics Calculator
Compute mean, median, mode, standard deviation, variance, quartiles, range, and more from any dataset with step-by-step formulas.
Used 0 times•Updated never
Regression Calculator
Fit a linear regression line to (x, y) data — slope, intercept, equation, correlation r, R², and predictions with step-by-step work.
Used 0 times•Updated never
Z Score Calculator
Convert raw scores to z-scores and back using z = (x − μ) ÷ σ, with percentile and step-by-step work.
Used 0 times•Updated never
Standard Deviation Calculator
Calculate sample and population standard deviation and variance from any data set with squared-deviation steps.
Used 0 times•Updated never
Mean Median Mode Calculator
Find the mean, median, and mode of any data set with frequency tables, sorted data, and step-by-step work.
Used 0 times•Updated never
Planet Weight Calculator
Find your weight on Mercury, Venus, Mars, Jupiter, the Moon, and other worlds. Enter Earth weight in kg or lb and compare surface gravity instantly. Free, browser-based.
Used 0 times•Updated never
Star Distance Calculator
Calculate star distance from parallax or magnitude. Convert between parsecs, light-years, AU, and km. Free, instant, browser-based astronomy tool.
Used 0 times•Updated never
Light Year Converter
Convert light-years to parsecs, AU, kilometers, meters, and miles. Enter any astronomical distance and get instant conversions with formulas. Free, browser-based.
Used 0 times•Updated never
Escape Velocity Calculator
Calculate escape velocity from mass and radius or surface gravity. Presets for Earth, Moon, Mars, Jupiter, and more. Results in km/s and m/s. Free, browser-based.
Used 0 times•Updated never