Everyday Calculators
The day-to-day tools: BMI, percentages, dates, fuel, electricity, scientific maths, conversions, and more. 51 calculators covering health, maths, time, conversion, daily NZ life, generators, and education.
Health and fitness
Body composition, energy expenditure, heart rate, and the everyday training maths.
BMI
Body mass index with the standard category bands.
Open calculatorCalorie Deficit
Daily calorie deficit needed to lose at a target rate.
Open calculatorBMR
Basal metabolic rate: calories burned at rest.
Open calculatorTDEE
Total daily energy expenditure including activity multiplier.
Open calculatorMax Heart Rate
Estimated maximum heart rate by age and the standard training zones.
Open calculatorVO2 Max
Estimate your VO2 max from a 1.5-mile or 12-minute run test.
Open calculatorRunning Pace
Pace, time and distance for any run, plus split times.
Open calculatorSleep
Best bed and wake times to align with full sleep cycles.
Open calculatorOvulation
Estimated fertile window based on cycle length.
Open calculatorGFR
Estimated glomerular filtration rate, a measure of kidney function.
Open calculatorCarbon Footprint
Estimated annual CO2 footprint based on travel, diet and home energy.
Open calculatorMaths and statistics
Standard, scientific, graphing, fractions, and a full statistical-distribution toolset.
Standard
A full-screen four-function calculator that just works.
Open calculatorScientific
Trig, log, exponentials, and memory functions in a clean layout.
Open calculatorGraphing
Plot any function or set of functions on a 2D coordinate plane.
Open calculator3D Graphing
Plot 3D surfaces from any z = f(x, y).
Open calculatorPercentage
Percent change, percent of a number, increase / decrease, and reverse percent.
Open calculatorFraction
Add, subtract, multiply and divide fractions with full working.
Open calculatorRight Angle Triangle
Solve a right triangle from any two known sides or one side and one angle.
Open calculatorTrigonometry
Sine, cosine and tangent of any angle, plus inverse functions.
Open calculatorSlope-Intercept Form
Convert between slope-intercept, point-slope and standard forms.
Open calculatorInequality
Solve linear and quadratic inequalities with a graphed solution set.
Open calculatorLinear Regression
Best-fit line, slope, intercept, R squared from a paired data set.
Open calculatorLogistic Regression
Logistic regression on binary outcome data.
Open calculatorANOVA
One-way analysis of variance across multiple groups.
Open calculatorT-Test
Independent and paired t-tests with full p-value working.
Open calculatorChi-Square
Chi-square test of independence or goodness-of-fit.
Open calculatorProbability
AND, OR, conditional and complement probability of any events.
Open calculatorBinomial Distribution
P(X = k) and P(X <= k) for binomial(n, p).
Open calculatorPoisson Distribution
Poisson probabilities for a given rate parameter.
Open calculatorHypergeometric Distribution
Sampling without replacement probabilities.
Open calculatorNegative Binomial Distribution
Probability of k failures before the r-th success.
Open calculatorBessel Functions
Bessel functions of the first and second kind.
Open calculatorTime, dates and timesheets
Date arithmetic, ages, time zones, and weekly timesheet hours.
Age
Exact age in years, months, weeks, days, hours and minutes.
Open calculatorDate
Difference between two dates or a date plus a duration.
Open calculatorWorld Clock
Current time across major NZ and world cities.
Open calculatorStopwatch & Timer
Stopwatch with lap times, plus a countdown timer with sound.
Open calculatorWork Hours & Timesheet
Weekly timesheet totals including breaks and overtime.
Open calculatorConversion
Length, area, volume, weight and the rest.
Daily NZ life
Fuel, power, RUC and the building-trade tools New Zealanders look up regularly.
Fuel Cost
Cost of a journey at the current pump price for any vehicle.
Open calculatorElectricity Cost
Monthly power bill at your kWh rate, with appliance breakdown.
Open calculatorRoad User Charges
RUC for diesel and EV vehicles by weight and distance.
Open calculatorCladding Profile Selection
Pick a cladding profile that suits your wall span and exposure.
Open calculatorRandom and generators
Passwords, random numbers, and ways to fairly pick people or teams.
Password Generator
Strong random password with adjustable length and character set.
Open calculatorRandom Number Generator
Pick any number of random integers in a range, with or without duplicates.
Open calculatorRandom Picker
Pick a random item from a list you provide.
Open calculatorRandom Team Generator
Split a list of names into balanced random teams.
Open calculatorEducation and miscellaneous
School and uni grade tools, plus a couple of long-tail favourites.