All 148 Free Online Tools

Every tool on OnlineToolHubs in one place, grouped across 11 categories. Each one runs in your browser — no account, no install, no upload of your data.

Showing 148 of 148 tools

Calculators (24)

BMI CalculatorWork out your BMI, and the measurement current NICE guidance asks for alongside it: waist-to-height ratio, which…
Age CalculatorYour exact age in years, months and days plus every other unit, the weekday you were born, your next birthday, and…
Date CalculatorFind the days, weeks, weekdays and exact years/months/days between two dates, or add or subtract days, weeks…
Percentage CalculatorA percentage calculator with the working shown: percent of a number, percent change, percent difference, reverse…
Tip CalculatorA tip calculator that works on the pre-tax or post-tax amount and shows what the choice costs, splits any number…
Unit ConverterA unit converter across 12 categories and 90+ units that shows the factor used, and whether it is exact by…
Standard Deviation & Variance CalculatorA standard deviation calculator for sample and population, with the full working, relative standard deviation, and…
Correlation Coefficient CalculatorPaste paired X and Y data for Pearson r, r², Spearman ρ, the t statistic and two-tailed p-value, a strength rating…
Quadratic Equation Formula SolverA quadratic equation solver for ax² + bx + c = 0: the discriminant step by step, real or complex roots, and the…
Fraction Arithmetic & Simplifier CalculatorAdd, subtract, multiply and divide fractions, including mixed numbers and an optional third fraction chained left…
Mean, Median, Mode & Range CalculatorGet the mean, median, mode and range of any list, with honest multimodal and no-mode results other calculators…
Weighted Average CalculatorCalculate a weighted average from any list of values and weights (raw counts or percentages), plus a reverse…
Cooking Measurement ConverterA cooking measurement converter that accounts for ingredient density, using King Arthur Baking's weight chart, so…
Scientific CalculatorA free scientific calculator with sin, cos, tan, logs, roots, powers, factorials and degree/radian modes.
Concrete CalculatorWork out how much concrete you need for a slab, footing, post hole, column or stairs, in cubic yards, cubic feet…
Deck CalculatorWork out deck boards (with the gap and a ripped last row), joists at 12, 16 or 24 in on center, deck screws and…
Square Footage CalculatorAdd up the square footage of rooms and odd shapes (rectangles, circles, triangles, trapezoids), subtract cut-outs…
Time CalculatorAdd or subtract hours, minutes and seconds, add time to a clock time, or find the time between two times, with…
Area CalculatorFind the area of a rectangle, triangle, circle, trapezoid, ellipse, sector, polygon and more, with the formula…
Paint CalculatorWork out how many gallons of paint you need for a room: walls minus doors and windows, number of coats, ceiling…
Electricity Cost CalculatorFind how much your appliances cost to run per day, month and year. Add devices by watts and hours, use your own…
Ratio CalculatorSimplify ratios like 12:18 to 2:3 (decimals and three-part ratios too), solve A:B = C:D for the missing value, or…
Probability CalculatorProbability of A and B, A or B, neither, at least once in n tries, or exactly k successes in n trials.
Tile CalculatorTiles and boxes for a floor or wall: several areas with cut-outs, any tile size and grout joint, waste by layout…

Currency & Finance (26)

Developer Tools (21)

Text & Language (10)

Image & Media (13)

Weather & Environment (5)

Data & Reference (5)

Health & Fitness (11)

Education (10)

Business (14)

PDF Tools (9)