OneTaskMaths Tools
Percentage and Scientific Calculators, Number Base Converter and Fractal Generators
Tools for maths, from the everyday to the beautiful. Percentages, averages and number base conversion, a scientific calculator, 3D function and vector field plotters, and generators for fractals and curves like the Mandelbrot set, Koch snowflake, spirographs and Lissajous figures.
204 tools tagged Maths
3D Function Plotter
Type z = f(x, y) and orbit the surface it makes.
3D Vector Field Plotter
Type Fx, Fy, Fz and see the field as coloured arrows.
Age Calculator
Exact years, months and days from any date of birth.
Amortization Schedule Calculator
Full loan amortization schedule by year or by month.
APR To APY Calculator
Convert APR to APY and back for any compounding frequency.
NewArc Length And Sector Area Calculator
Arc length, sector area, chord and segment from radius and angle.
NewArea Calculator
Area of eleven common 2D shapes, with the working shown.
NewArithmetic Sequence Calculator
The nth term, the sum and the rule, with the working.
Aspect Ratio Calculator
Missing width or height for a ratio, and how to crop or pad.
ATAR Estimator
Unofficial ATAR estimate from scaled study scores using the aggregate method.
Audio Bitrate Calculator
Sample rate, bit depth and channels to kbps and file size per minute.
Average Calculator
Mean, median, mode and range of any list of numbers.
Baker's Percentage
Baker's percentages, dough hydration and true sourdough hydration from gram weights.
Base Converter
Convert numbers between binary, octal, decimal and hex.
Beam Load Calculator
Bending stress and deflection of a beam under an even load.
NewBinomial Probability Calculator
Exactly, at most and at least k successes in n trials.
BMI Calculator
Body mass index from metric or imperial height and weight.
BMI Calculator For Men
BMI for men with the healthy range and a male BMI chart.
UpdatedBMI Calculator For Women
BMI for women with the healthy range and a female BMI chart.
CAGR Calculator
Compound annual growth rate between two values over time.
Capital Gains Calculator
Capital gain, tax at your own rate and annualised return.
Capital Growth Calculator
Future property value or the growth rate since purchase.
CBM Calculator
Cubic metres of a shipment from carton size and count, plus container fit.
Celsius To Fahrenheit
Convert Celsius to Fahrenheit with the exact formula.
Child And Teen BMI Calculator
BMI percentile for ages 2 to 20 by the CDC growth chart method.
Child Height Predictor
Predicted adult height from parents' heights, in ft/in or cm.
NewCircle Calculator
Radius, diameter, circumference and area from any one of them.
Cm To Inches
Convert centimetres to inches with the exact factor.
NewCompleting The Square Calculator
Vertex form, vertex and roots of any quadratic, step by step.
Compost Calculator
Compost bin volume, greens to browns mix and how much finished compost.
Compound Interest Calculator
Growth on a balance, with regular contributions and the real rate.
NewConfidence Interval Calculator
Confidence interval for a mean, using t or z.
NewCorrelation Coefficient Calculator
Pearson r, Spearman rho and significance from paired data.
Crop Factor Calculator
Equivalent focal length, crop factor and angle of view for any sensor size.
Crop Yield Calculator
Sample plot weight to tonnes per hectare, bushels per acre and field total.
Cubic Metres To Cubic Feet
Convert cubic metres to cubic feet with the exact factor.
Curtain Size Calculator
Curtain width, drop and fabric for a window and heading style.
Debt Payoff Calculator
Debt-free date and interest with the avalanche or snowball method.
Decibel Calculator
Convert dB and ratios, add sound levels, and find distance drop.
NewDecimal To Fraction Calculator
Decimals to simplified fractions, recurring decimals and inch fractions included.
NewDefinite Integral Calculator
The integral between two limits, the area and the average value.
NewDegrees To Radians
Convert degrees to radians: multiply by π/180.
Density Calculator
Density, mass or volume from the other two, with a common materials table.
Depth Of Field Calculator
Near and far focus limits and hyperfocal distance for any lens and sensor.
NewDerivative Calculator
Derivatives with the rules shown, plus the tangent at a point.
NewDeterminant And Inverse Matrix Calculator
Determinant and inverse of a square matrix, as exact fractions.
Dimensional Weight Calculator
Volumetric weight of a parcel and which weight the courier will bill.
Discount Calculator
Percent off, final price, and what stacked discounts really come to.
NewDistance Formula Calculator
Distance between two points, with the exact root and working.
Dividend Calculator
Dividend yield, income per payment and reinvestment growth.
Dollar Cost Averaging Calculator
Average cost from regular fixed investments, versus a lump sum.
Due Date Calculator
Estimated due date from last period or conception date, with weeks today.
EBITDA Calculator
EBITDA, EBIT and adjusted EBITDA from net profit, with margins.
NewExpected Value Calculator
Expected value, variance and SD of a set of outcomes.
Exponent Calculator
Raise a number to any power, with exact results for big powers.
NewExponential Growth And Decay Calculator
Final amount, doubling time or half-life for steady percentage growth or decay.
Exposure Calculator
EV from aperture, shutter and ISO, with equivalent settings at other f-stops.
Factor Calculator
All the factors, factor pairs and prime factorisation of a number.
Factorial Calculator
Exact n factorial up to 5000!, with digits and trailing zeros.
Feet To Cm
Convert feet to centimetres: multiply by 30.48.
Fertiliser NPK Calculator
Area, nitrogen rate and N-P-K on the bag to kilograms, g/m² and bags.
Field Area Calculator
Length and width to acres, hectares, square metres and fence length.
Final Grade Calculator
Weighted grade so far and the exam mark you need for a target.
NewFive Number Summary Calculator
Min, quartiles, median, max, IQR and outliers.
UpdatedFraction Calculator
Add, subtract, multiply and divide fractions, with the working shown.
NewFraction To Decimal Calculator
Fractions and mixed numbers to decimals, repeating digits marked.
Freight Cost Calculator
LTL freight cost from weight, rate per 100 lb, fuel and extras.
UpdatedFTE Calculator
Full-time equivalents from a mix of full-time and part-time hours.
NewFunction Grapher
Graph up to three functions with roots and turning points marked.
Future Value Calculator
Future value or present value of money at any rate.
Game Of Life
Conway's cellular automaton with cell size, density and speed sliders.
Garden Area Calculator
Garden or lawn area for any shape in m², ft² and acres.
GCF Calculator
Greatest common factor of two or more numbers, with every step.
Gear Ratio
Gear ratio, output rpm and road speed from tooth counts.
NewGeometric Sequence Calculator
The nth term, the sum and the infinite sum, with the working.
GPA Calculator
Credit-weighted GPA on a 4.0 or 7.0 scale, with a target check.
Grade Calculator
Points scored to percentage, letter grade and grade points.
Grass Seed Calculator
Grass seed for a new lawn or overseeding, in kilograms and bags.
Harmonograph Generator
Damped pendulum figures; set frequencies, detune and damping, save the spiral.
Hectares To Acres
Convert hectares to acres with the exact factor.
Horsepower Calculator
Horsepower from torque and rpm, or from weight and quarter-mile time.
UpdatedInches To Feet
Convert inches to feet: divide by 12.
NewInequality Calculator
Solve a linear or double inequality, with interval notation and the number line.
NewInteractive Unit Circle
Drag the angle and see sin, cos and tan as lengths.
UpdatedInterest-Only Mortgage Calculator
Interest-only repayments and what happens when they end.
Investment Calculator
Investment growth from a lump sum plus monthly contributions.
Irrigation Calculator
Litres per week, per session and hose run time for any garden area.
Julia Set Explorer
Click to zoom into Julia set fractals; export the view at 4K.
Kelvin To Celsius
Convert kelvin to Celsius by subtracting 273.15.
Kelvin To Fahrenheit
Convert kelvin to Fahrenheit with the exact formula.
Kg To Lbs
Convert kilograms to pounds with the exact factor.
Kg To Stone
Convert kilograms to stone and pounds.
Koch Snowflake Generator
Koch snowflake and anti-snowflake to any depth; export as PNG.
L-System Tree Generator
Fractal trees from rewriting rules; depth, angle and randomness sliders.
Langton's Ant
Two-rule ant that builds chaos and then a highway; sliders and fullscreen.
NewLaw Of Sines And Cosines Calculator
Missing sides and angles by the law of sines or cosines.
LCM Calculator
Least common multiple of two or more numbers, with the working.
Leap Year Checker
Is it a leap year, which rule decides it, and the next one.
Lease Vs Buy Calculator
Net cost of leasing a car versus buying on finance over the same term.
Length Converter
Convert between metric and imperial lengths.
NewLinear Equation Calculator
Solve one-variable linear equations with full working.
NewLinear Regression Calculator
Least-squares line of best fit, R² and predictions.
Lissajous Curve Generator
Two sine waves at right angles; set the frequencies and phase, save the figure.
Livestock Weight Calculator
Live weight of cattle, sheep, goats and pigs from a tape measure.
Loan Comparison Calculator
Compare two loans by payment, interest, fees and total cost.
Loan Repayment Calculator
Car and personal loan repayments, and what a flat rate really costs.
Loan-to-Value Calculator
The LVR of a mortgage and what it takes to hit a target.
Log Calculator
Logarithms in base 10, e, 2 or any base, and antilogs.
NewLong Division Calculator
Long division with every step shown, remainders or decimals.
NewLong Multiplication Calculator
Column multiplication with every row and the final sum shown.
Love Calculator
The LOVES percentage and FLAMES game from two names, working shown.
M/s To Km/h
Convert metres per second to kilometres per hour: multiply by 3.6.
Mandelbrot Explorer
Click to zoom into the Mandelbrot set; export the view at 4K.
NewMargin Of Error Calculator
Plus-or-minus for a poll or survey result.
Markup Calculator
Sale price from cost and markup, with the matching margin.
NewMatrix Calculator
Matrix multiplication, addition and transpose with working.
Megapixel Calculator
Pixels to megapixels and megapixels to pixels, with print size.
Metres To Feet
Convert metres to feet with the exact factor.
Metres To Yards
Convert metres to yards with the exact factor.
NewMidpoint Calculator
Midpoint of a segment, or the missing endpoint from the midpoint.
NewMixed Number Calculator
Add, subtract, multiply and divide mixed numbers with steps.
Modulo Calculator
Find a mod n for huge or negative numbers in every convention.
Mortgage Comparison Calculator
Which of two home loans is cheaper once fees count.
Mortgage Offset Calculator
Interest and years saved by an offset account.
Mortgage Repayment Calculator
Home loan repayments with amortisation schedule, offset and extra repayments.
Mortgage Repayment Calculator Australia
Australian home loan repayments with offset, extra repayments and the full schedule.
UpdatedMulch & Topsoil Calculator
Mulch, topsoil and compost by volume, bags and weight, with waste.
NewMultiplication Chart
Multiplication grid for any range of numbers, up to 30 by 30.
Music Interval Calculator
Interval name, semitones, cents and just ratio between any two notes.
NewNormal Distribution Calculator
Areas under any bell curve, and values at a percentile.
NPV And IRR Calculator
Net present value, IRR, payback and profitability index.
Ovulation Calculator
Ovulation date and fertile window from your last period and cycle length.
Paint Calculator
Litres and cans from wall area, coats and coverage rate.
Parametric Surface Plotter
Plot x(u,v), y(u,v), z(u,v) as a 3D surface and orbit it.
NewPercent To Fraction Calculator
Percentages to simplified fractions and decimals, with working.
Percentage Calculator
What is X% of Y, percentage change, difference, and reverse percentages.
NewPercentage Change Calculator
Percentage change from old to new, with working and average rate.
NewPercentile Calculator
Value at a percentile, or percentile rank of a value.
NewPerimeter Calculator
Perimeter of twelve common 2D shapes, with the working shown.
Permutation And Combination Calculator
nCr and nPr, with and without repetition, exact to the last digit.
Pitch Shift Calculator
Semitones and cents to a frequency ratio, speed and tempo.
Plant Spacing Calculator
How many plants fit a bed at a given spacing, square or offset rows.
NewPolynomial Root Calculator
Real and complex roots of any polynomial, with factorisation.
NewPrime Factorisation Calculator
Prime factors of any number, with the division ladder shown.
Prime Number Checker
Check if a number is prime, or list the primes in a range.
Probability Calculator
Combine two probabilities, and the odds of at least once.
Profit Margin Calculator
Gross margin from cost and price, or the price for a target margin.
Property Cash Flow Calculator
What a rental property costs or pays you each week.
NewProportion Calculator
Find the missing number in a/b = c/d, with the cross multiplication shown.
Pythagorean Theorem Calculator
Find the hypotenuse or a missing side of a right triangle.
Quadratic Equation Calculator
Solve ax² + bx + c = 0, with exact roots and the vertex.
Rafter Length Calculator
Common rafter length, rise and cut angles from span and pitch.
Raised Bed Soil Calculator
Soil volume, weight, topsoil and compost split and bags for a raised bed.
Random Walk Art
Walkers take thousands of random steps; the path becomes the picture.
UpdatedRatio Calculator
Simplify a ratio, split an amount in it, or scale it up.
NewRegular Polygon Calculator
Every measurement of a regular polygon from one known value.
Rental Yield Calculator
Gross and net rental yield on an investment property.
NewRight Triangle Calculator
Every side and angle of a right triangle from any two values.
Ring Size Converter
Ring sizes across US, UK, EU, Japan and inside diameter in mm.
ROI Calculator
ROI as gain over cost, plus the annualised rate for the holding period.
Roof Pitch Calculator
Roof pitch, angle and slope percentage from rise and run.
Root Calculator
Square, cube and nth roots, with the radical simplified.
Rose Curve Generator
The r = cos(kθ) flower; set n and d, save the petals as PNG.
Rounding Calculator
Round to decimal places or the nearest 10, with five rounding rules.
Sample Length Calculator
Convert between samples, milliseconds, seconds, beats and bars.
NewSample Size Calculator
How many responses a survey needs.
SAT And ACT Score Calculator
SAT totals, ACT composites and the official conversion between them.
Savings Goal Calculator
The weekly, fortnightly or monthly amount that reaches a savings target on time.
Scientific Calculator
Trig, logs, powers, factorials and memory, in one expression.
Scientific Notation Converter
Convert numbers to scientific, E and engineering notation and back.
Seeding Rate Calculator
Seed rate in kg/ha from target plants, TSW and establishment.
Sensor Size Calculator
Sensor dimensions, area, crop factor and pixel pitch for any format.
Sierpinski Triangle Generator
Sierpinski triangle by subdivision or chaos game; export as PNG.
Significant Figures Calculator
Count significant figures and round to any number of them.
Simple Interest Calculator
Simple interest, total amount and interest per year and month.
NewSlope Calculator
Slope, y = mx + b, angle and grade from two points.
NewSlope-Intercept Form Calculator
Slope, intercepts and every form of a line from two points.
Spirograph Generator
Set the ring, gear and pen offset; the curve draws until it closes.
Square Km To Square Miles
Convert square kilometres to square miles with the exact factor.
Stair Calculator
Steps, riser height, run and stringer length from total rise.
Standard Deviation Calculator
Sample and population standard deviation and variance of a list.
Stock Profit Calculator
Profit, percentage return and break-even price on a share trade.
NewSummation Calculator
Sigma notation sums with the terms written out.
NewSurface Area Calculator
Total and side surface area of eleven 3D solids.
NewSystem Of Equations Calculator
Solve simultaneous equations with every elimination step.
TDEE & Calorie Calculator
Daily calorie needs from the Mifflin-St Jeor equation.
Time Stretch Calculator
Stretch ratio, new length and pitch change between two tempos.
NewTimes Tables Practice
Timed times tables quiz that re-asks the facts you miss.
Tip Calculator
The tip, the total and each person's share of the bill.
Tonnes To Pounds
Convert metric tonnes to pounds with the exact factor.
NewTriangle Calculator
Every side, angle and the area of a triangle from three known parts.
NewTrig Calculator
All six trig functions and their inverses, with exact values.
TV Viewing Distance Calculator
Ideal viewing distance for any TV size, and the right size for your room.
Tyre Size Calculator
Tyre diameter, sidewall, circumference and speedo error when changing size.
UpdatedUK Mortgage Repayment Calculator
UK mortgage repayments in pounds with overpayments, interest only and the full schedule.
US Mortgage Payment Calculator
US mortgage payment with amortization schedule, extra payments and PMI explained.
Video Bitrate Calculator
File size from bitrate and duration, or the bitrate for a size limit.
NewVolume Calculator
Volume of eleven common 3D solids, with the working shown.
Voronoi Diagram Generator
Paste points, get Voronoi cells or Delaunay triangles; download SVG or PNG.
Wallpaper Calculator
Rolls of wallpaper from wall size, roll size and pattern repeat.
UpdatedWAM Calculator
Weighted average mark from unit marks, credit points and year level.
Wedding Cost Calculator
Total wedding budget and cost per guest from your own figures.
Weighted Average Mark Calculator
Marks and weightings to an overall grade, with the classification band.
NewZ-Score Calculator
Z-score, percentile and tail areas from a value, mean and SD.