All online calculators
Browse practical tools for loans, percentages, currency, calories, tiles, laminate, age and business days.
Currency converter
Convert amounts between common currencies for quick estimates.
Calorie calculator
Estimate daily calories and macronutrients from body data and activity.
Loan calculator
Estimate a monthly loan payment, total repayment and overpayment.
BMI calculator
Calculate body mass index from height and weight.
Mortgage calculator
Estimate mortgage payment, loan amount and overpayment.
Percentage calculator
Find a percentage, a share, an adjusted value or relative change with a clear comparison base.
USD to EUR converter
Convert US dollars to euros for quick estimates.
Discount calculator
Compare unit price and savings after consecutive discounts, with a quantity total.
EUR to MDL converter
Convert euros to Moldovan lei for quick estimates.
Tile calculator
Estimate tiles, packs and adhesive for a floor or wall area.
USD to MDL converter
Convert US dollars to Moldovan lei for quick estimates.
Age calculator
Calculate exact age in years, months and days.
Compound interest calculator
Estimate investment growth with compounding and regular contributions.
Laminate calculator
Estimate laminate packs from room dimensions and reserve.
Running pace calculator
Calculate running pace, speed and race time predictions.
Wallpaper calculator
Estimate wallpaper rolls from room size, roll size and pattern repeat.
One-rep max calculator
Estimate one-rep max from weight and repetitions.
Paint calculator
Estimate paint liters and cans for walls or a manual area.
Margin and markup calculator
Work out markup, margin, profit and selling price from cost.
Floor screed calculator
Estimate screed volume and the number of dry mix bags for a floor.
Length converter
Convert between metric and imperial length units.
Temperature converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine.
Date calculator
Find the date a number of days, weeks, months or years from a start date.
Digital storage converter
Convert bytes between decimal and binary units.
Mean, median and standard deviation calculator
Mean, median, mode, range and standard deviation for a list of numbers.
Mass converter
Convert mass between metric and imperial units.
Area converter
Convert area between metric and imperial units.
Break-even point calculator
Find how many units you must sell to cover your costs.
CAGR calculator
Average annual growth rate between two values.
Body fat percentage calculator
Historical body-fat estimate from height and circumferences, using branch-specific measurement sites.
Business days calculator
Count business days between two dates with optional excluded dates.
Volume converter
Convert volume between litres, cubic metres and gallons.
50/30/20 budget calculator
Split income into needs, wants and savings.
Brick and block calculator
Bricks or blocks needed for a single-leaf wall.
Slab foundation calculator
Concrete volume and reinforcing mesh for a raft slab.
Speed converter
Convert speed between km/h, m/s, mph and knots.
Circle calculator
Area, circumference, diameter and radius from any one of them.
Concrete calculator
Concrete volume for a slab, a strip or columns, with an allowance.
Pressure converter
Convert pressure between pascals, bars, atmospheres and psi.
Steps to distance and calories calculator
Distance from step count and measured length or height; energy from an explicit editable coefficient.
Ideal weight calculator
Compare Devine, Robinson, Miller and Hamwi with adult BMI boundaries, without prescribing a target.
Loan refinancing calculator
Compares your current loan with a new one and shows what switching is actually worth.
Savings rate calculator
The share of income left after expenses.
Square calculator
Area, perimeter and diagonal of a square from any one of them.
Strip foundation calculator
Concrete volume for a strip from its length, width and depth.
Time converter
Convert time between milliseconds, seconds, minutes, hours, days and weeks.
Calories from macros calculator
Energy from macro grams using 4/9/4 and calorie shares, with fibre and labelling limits.
Cooking volume converter
Convert cups, spoons and millilitres — metric and US measures differ.
Energy converter
Convert energy between joules, kilowatt-hours, calories and BTU.
Geometric progression calculator
The n-th term, the sum of the series and the terms themselves.
Plaster calculator
How much dry mix a wall needs at a given layer thickness.
Rectangle calculator
Area, perimeter and diagonal of a rectangle from its sides or its area.
ROI calculator
Return on investment, with additional costs counted properly.
Voltage drop calculator
Voltage lost along a cable run, from its length, cross-section and material.
Commission calculator
Commission, deal amount or rate — whichever you are missing.
Cooking weight converter
Cups, spoons and millilitres into grams — and back — for a chosen product.
Data rate converter
Convert data rate between Mbit/s and MB/s — bits are not bytes.
Debt-to-income calculator
What share of income before tax goes to debt payments.
Insulation calculator
Insulation volume, number of slabs and packs from area and thickness.
Power converter
Convert power between watts, kilowatts and both kinds of horsepower.
Triangle calculator
Triangle area from three sides or base and height; perimeter and classification require all three sides.
Underfloor heating pipe calculator
Pipe length and number of loops for a wet underfloor heating layout.
Weighted average calculator
An average that respects how much each value counts: grades, shares, volumes.
Angle converter
Convert angles between degrees, radians, gradians and turns.
Annuity payment calculator
The level payment and a month-by-month schedule of interest against principal.
Drywall calculator
Sheets, profile and screws for a plasterboard wall or ceiling.
Frequency converter
Convert frequency between hertz, kilohertz, megahertz and rpm.
Right triangle calculator
Hypotenuse, leg, area and perimeter by the Pythagorean theorem.
Roof area calculator
Slope area from the footprint and the pitch, in degrees or per cent.
Room volume calculator
Volume of a room from its dimensions or floor area.
Savings goal calculator
How much to put aside each month, or how long a goal takes at a given contribution.
Simple interest calculator
Interest charged on the initial amount only, in both directions.
Board volume calculator
Volume of timber, of a single board, and boards per cubic metre.
Fence calculator
Posts, bays and rails for a fence of a given length.
Force converter
Convert force between newtons, kilogram-force and pound-force.
Fraction calculator
Add, subtract, multiply and divide fractions with exact reduction.
Linoleum calculator
Running metres of roll flooring for a room, with strips, seams and offcut.
Proportion calculator
Solve a : b = c : d for any of the four terms.
Utility bills calculator
Adds up metered utilities and fixed charges into one monthly total.
Week number calculator
ISO week and ordinal day for a valid Gregorian date.
Barbell plate calculator
Which plates to load on each side to reach a target weight.
Density converter
Convert density between kg/m³, g/cm³ and pounds per cubic foot.
Down payment calculator
Down payment and loan amount from the price and the percentage put down.
Generator fuel calculator
How much fuel a generator burns over a shift, and what it costs.
Newton's second law calculator
Force, mass or acceleration from F = m · a.
Price per unit calculator
Price per kilogram, litre or piece, and a comparison of two packs.
Quadratic equation calculator
Solve ax² + bx + c = 0 and see the discriminant.
Time duration calculator
Duration between two times, or a time shifted by a duration.
Wood weight calculator
Weight of timber from its volume, species and moisture content.
Working day cost calculator
What one working day and one working hour are worth at your salary.
Battery charge time calculator
How long a battery takes to charge at a given current.
Calories per serving calculator
Calories of a whole dish and of one serving, from the ingredient list.
Cuboid calculator
Volume, surface area and space diagonal from three edges.
Dividend yield calculator
Annual dividend as a share of the entered share price.
Flow rate converter
Convert volumetric flow between m³/h, litres per minute and CFM.
Instalment plan calculator
The monthly payment on an instalment plan with a markup, plus the schedule.
Kinetic energy calculator
Kinetic energy, speed or mass from E = ½mv².
Ohm's law calculator
Voltage, current or resistance from the known pair, with power dissipation.
Pile foundation calculator
Concrete for bored piles and the grillage beam that ties them together.
Probability calculator
Probability of an event, its complement and of two independent events.
Remainder calculator
Divide with remainder and see the quotient and the check.
Room lighting calculator
How many lumens a room needs and how many lamps that comes to.
Circular sector calculator
Sector area, arc length and chord from the radius and the angle.
Cylinder calculator
Volume, lateral and total surface area of a cylinder from radius and height.
Density calculator
Density, mass or volume of a substance from ρ = m ÷ V.
Exercise calorie calculator
Gross session calories from MET, with a 1 MET reference and its difference over the same time.
Leap year calculator
Check whether a year is a leap year and find the nearest ones.
pH and pOH calculator
pH from hydrogen ion concentration and back, with pOH and the medium.
Prime factorisation calculator
Break a number into prime factors and count its divisors.
Roof batten calculator
Running metres, battens and timber volume for roof battening.
Subscriptions cost calculator
Brings monthly and yearly subscriptions to one comparable monthly figure.
Torque converter
Convert torque between N·m, kgf·m and pound-force feet.
Contribution margin calculator
What is left of the price after variable costs.
Day of the week calculator
Which day of the week a date falls on.
Dilution calculator
The C₁V₁ = C₂V₂ rule solved for either volume.
Download time calculator
How long a file takes on your connection, bits and bytes kept apart.
Engagement rate calculator
Engagement rate of a post, by reach or by follower count.
Marketplace fee calculator
Platform commission, card processing, shipping and storage — the whole chain of deductions at once.
Parallelogram calculator
Area from a base and height, or from two sides and the angle between them.
Potential energy calculator
Potential energy, height or mass from E = mgh.
PPI calculator
Screen pixel density from the resolution and the diagonal.
Pressure calculator
Pressure, force or area from p = F ÷ A.
Resistor colour code calculator
Resistor value from its four colour bands, with the tolerance range.
Roman numeral converter
Convert between Roman and Arabic numbers, both ways.
Shared budget split calculator
Splits a shared amount between people equally or in proportion to income.
Trapezoid calculator
Area of a trapezoid from its two bases and height; perimeter from the legs.
Waist ratio calculator
WHtR and WHR with measurement protocol and conditional NICE adult-screening boundaries.
Z-score calculator
How many standard deviations a value sits away from the mean.
Bicycle wheel size calculator
Estimate wheel geometry from ETRTO, or calculate it from a measured outside diameter.
Credit card payoff calculator
How many months a card balance takes to clear at a fixed payment.
Crypto profit calculator
Trade result for long and short positions including entry and exit fees and leverage.
Customer acquisition cost calculator
Average acquisition spend per new customer and lifetime revenue divided by CAC.
Golden ratio calculator
Split a segment in the ratio φ, or find the partner to a given size.
Illuminance converter
Convert illuminance between lux, foot-candles and phots.
Logarithm calculator
Common, natural and any-base logarithms with a check.
Market cap calculator
Market capitalisation from the share count and the price per share.
Radiation dose converter
Sieverts, millisieverts, microsieverts and rem, converted both ways.
Solution concentration calculator
Per cent by mass, mass per volume and parts per million.
Sphere calculator
Volume and surface area of a sphere from its radius, diameter or volume.
Word and character counter
Words, characters with and without spaces, sentences and paragraphs in one pass.
Work calculator
Work done by a force over a distance, including the angle between them.
Absolute and relative difference
How much two values differ, in units and in per cent.
Average order value calculator
Revenue divided by the number of orders.
Cone calculator
Volume, slant height and surface area of a cone from radius and height.
Fuel consumption calculator
Litres per 100 km from a fill-up, or the fuel a trip will need.
Hydrostatic pressure calculator
Pressure of a liquid column from density and depth.
Inventory turnover calculator
Inventory turnover and days on hand from the cost of goods sold.
Mechanical power calculator
Power, work or time from P = W ÷ t.
Molarity calculator
Molar concentration of a solution from moles or from a mass.
Polygon area from coordinates calculator
Area, perimeter and centroid of a simple polygon from ordered vertices.