Rekenmachines voor elke dag
Rekenmachines voor klussen in huis en onderweg. Verdeel een rekening of fooi, bereken hoeveel vlonderplanken, verf of grind u nodig hebt, vergelijk eenheidsprijzen in de winkel, schat de brandstofkosten van een rit of het cijfer dat u bij een examen nodig hebt.
Vul uw eigen maten en prijzen in en de uitkomsten veranderen terwijl u typt.
Home and DIY Alle bekijken
Roof Pitch CalculatorFind roof pitch angle, ratio and rafter length from the rise and run.Decking CalculatorWork out how many decking boards, joists and screws you need for a deck of any size.Concrete CalculatorWork out the concrete for a slab, footing or round post holes, in cubic metres, tonnes and bags, with a DIY mix.Paint CalculatorFind out how many litres of paint a room needs, and which tin sizes to buy, allowing for doors, windows and coats.Wallpaper CalculatorCount the rolls of wallpaper for a room from the wall height, roll size and pattern repeat.Tile and Paving CalculatorCount the tiles or paving slabs for a floor, wall or patio, with joints and waste, plus grout or sub-base.Carpet CalculatorWork out how much carpet to order from a 3.66, 4 or 5 metre roll, which way to cut it, and the joins.Brick and Block CalculatorCount the bricks or blocks for a wall of any length and height, with openings, joints, waste and mortar.Stair CalculatorPlan a staircase: number of steps, height of each riser, going and pitch, checked against the England building rules for stairs in a home.Fence Panel and Post CalculatorCount the panels, posts and gravel boards for a fence run, allowing for gates and separate sections.Square Metre Calculator for RoomsAdd up the floor area of several rooms in square metres, square feet and square yards, and take off cut-outs.Radiator Size Calculator (BTU)Estimate how much heat a room loses, and the radiator output in BTU and watts to heat it, from its walls, windows, floor and roof.Electricity Cost CalculatorWork out what appliances cost to run a day, month and year from their power in watts, the hours used and your price per kWh.
Shopping and bills Alle bekijken
Split Bill CalculatorSplit a bill with a tip, by equal shares, uneven shares or what each person ordered, with rounding.Unit Price Comparison CalculatorCompare up to four products by price per kilo, per litre, per item or per metre, including multipacks and different units.Cost Per Use CalculatorSee what something really costs each time you use it, with resale value and running costs, and compare two items.Cashback CalculatorWork out how much cashback a card or scheme gives you a year after any cap and annual fee, and the spend needed to break even.Multi-buy Deal CalculatorSee what 3 for 2, 2 for £3, buy one get one and half price offers really save, for the number you want to buy.Subscription Cost CalculatorAdd up what weekly, monthly and yearly subscriptions cost you a month, a year and a day.Tip CalculatorWork out the tip, the total bill and each share, with optional rounding.Discount CalculatorFind a sale price, the effect of several discounts in a row, or the original price.
Car and travel Alle bekijken
EV Charging Cost CalculatorWork out what it costs to charge an electric car between two levels, the range added, the cost a mile and the time at your charger.Tyre Size CalculatorWork out the sidewall, overall diameter and circumference of a tyre, and how a different size changes your speedometer.Stopping Distance CalculatorSee the thinking, braking and total stopping distance for any speed, using the Highway Code figures, with wet and icy road estimates.Electric vs Petrol Running Cost CalculatorCompare a year of fuel for a petrol or diesel car against an electric car, from your mileage, economy and the price of fuel and electricity.Fuel Cost CalculatorEstimate the fuel for a trip and its cost, using miles per gallon or litres per 100 km.
School and study Alle bekijken
UK Degree to US GPA ConverterEstimate a US GPA from a UK degree class or percentage, or a UK class from a GPA.UK Degree Classification CalculatorTurn your module marks and credits into a weighted average and a degree class, and see the average you need on the modules still to come.UCAS Tariff Points CalculatorAdd up UCAS Tariff points from A levels, AS levels, EPQ, Scottish Highers, BTEC Nationals and T Levels, using the 2026 tables.Study Time PlannerShare your revision hours between topics between today and the exam, using the days you can study and how heavy each topic is.Test Score Percentage CalculatorTurn marks into a percentage for one test or several, and work out the marks needed on the next test to reach a target overall.Times Tables PracticePractise the times tables you choose against the clock and see which ones need more work.Maths Worksheet GeneratorMake a printable arithmetic worksheet for a primary year group, with an answer key that matches.Mental Maths TrainerQuick-fire practice with number bonds, doubles, halves, rounding, percentages, fractions and squares.Money Counting PracticeCount UK coins and work out change, with three levels from pence to pounds.Clock Face Learning ToolSet the hands on an analogue clock, read the time in words and digits, or test yourself on reading the clock.Number Line GeneratorDraw a number line with whole numbers, decimals or fractions, with missing labels and marked points, ready to print.Fraction Wall GeneratorMake a printable fraction wall with the rows you choose, and highlight any fraction to see its equivalents.Column Method CalculatorSee column addition, subtraction, long multiplication and short division written out step by step.Revision Timetable PlannerTurn your subjects, exam dates and confidence into a day-by-day revision plan you can print.Assignment Deadline PlannerBreak an essay, report or project into stages and see when each should start and finish before the deadline.Reading Goal CalculatorWork out pages a day to finish a book by a date, when you will finish at your pace, or what a yearly book goal needs.GPA CalculatorWork out your GPA on the US 4.0 scale, or your average for a UK degree classification.Grade CalculatorWork out your grade so far and the score you need on the final exam to reach a target.
Screens and tech Alle bekijken
Aspect Ratio CalculatorFind the aspect ratio of any size and work out a new width or height that keeps it.Screen DPI and PPI CalculatorWork out pixel density from a screen resolution and its size in inches.Download Time CalculatorEstimate how long a file takes to download or upload at a given connection speed.TV Size and Viewing Distance CalculatorFind the best viewing distance for a TV size and resolution, or the best TV size for the distance from your sofa.Battery Life CalculatorWork out how long a battery lasts for a given power draw, or what size of battery you need to run something for a set time.Power Bank Charge CalculatorFind out how many times a power bank will charge your phone or tablet, allowing for conversion losses, and how long it takes to recharge.Mobile Data Usage CalculatorEstimate your monthly data use from the hours you stream, browse, game and call, and see whether it fits your plan.RAID Capacity CalculatorWork out the usable space and the drive failures survived for RAID 0, 1, 5, 6 and 10 from the number and size of your drives.
Sport and games Alle bekijken
Odds ConverterConvert betting odds between fractional, decimal and American, and see the chance they imply.Each Way Bet CalculatorWork out the returns on an each way bet when the runner wins, places or loses, with an optional Rule 4 deduction.Accumulator and Full Cover Bet CalculatorWork out accumulator, Trixie, Yankee, Lucky 15, Heinz and other full cover bet returns from up to eight selections.Dutching CalculatorSplit a stake across several outcomes so each one returns the same amount, and see whether the total comes out ahead.Overround and Margin CalculatorAdd up the odds in a market to find the bookmaker's margin, and see fair odds with the margin taken out.Golf Handicap Calculator (World Handicap System)Work out score differentials and a World Handicap System Handicap Index from up to 20 rounds, then a Course Handicap.Stableford Points CalculatorScore a round of golf in Stableford points from your hole by hole scores, par, stroke index and handicap.Cricket Run Rate CalculatorFind the current run rate, the required run rate and the projected total in a limited overs cricket innings.Cricket Batting and Bowling Average CalculatorCalculate batting average, strike rate, bowling average and economy, and the runs needed to reach a target average.Cricket Net Run Rate CalculatorCalculate a team's net run rate over one or more matches, counting full overs when a side is bowled out.Football League Table GeneratorEnter match results and get a sorted league table with points, goal difference and the tie-break rule you choose.Round Robin Fixture GeneratorCreate a round robin schedule where every team plays every other team, with byes for odd numbers and home and away balance.Tournament Bracket GeneratorDraw a single or double elimination bracket for 2 to 64 entrants, with seeding and byes, ready to print.Darts Checkout CalculatorFind the way to finish any score from 2 to 170 in darts, with every route and a full checkout chart.Snooker Points Remaining CalculatorWork out the most points left on the table in a frame of snooker and whether the player behind needs snookers.Tennis Score TrackerKeep the score of a tennis match point by point, with games, sets, tie-breaks, deuce, the server and undo.Ten-Pin Bowling Score CalculatorScore a game of ten-pin bowling frame by frame from your strikes, spares and misses, and see the best score still possible.Cycling Gear Inches CalculatorCompare bicycle gears by gear inches, metres of travel per pedal turn and speed at your cadence.Swimming Lengths CalculatorConvert between swimming distance and pool lengths in metres or yards, and work out your pace for each 100.Chess ClockA two player chess clock with increment or delay, common time controls, move counts and a flag when time runs out.Elo Rating CalculatorWork out expected scores and your new Elo rating after one game or a whole event, with the K-factor you choose.Scrabble Word Score CalculatorScore a Scrabble word with letter values, double and triple letter and word squares, blanks and the seven tile bonus.Poker Hand Odds CalculatorRank your poker hand and see your chance of winning against random opponents, and what you will make by the river.Knitting Gauge CalculatorWork out how many stitches to cast on from your gauge, or convert a pattern to your own tension.Guitar Chord FinderPick a chord and see open and barre shapes drawn as diagrams, with the frets and the notes in standard tuning.Music Scale FinderSee the notes of any major, minor, mode, pentatonic or blues scale and the chords in it, or find scales that fit your notes.Piano Chord FinderSee any chord on a keyboard with its notes and inversions, or type notes to find out what chord they make.
Garden Alle bekijken
Gravel, Topsoil and Bark CalculatorWork out how much gravel, crushed stone, sand, topsoil or bark to order for a path, bed or drive, in cubic metres, tonnes and bags.Lawn Turf and Grass Seed CalculatorFind out how many rolls of turf or how much grass seed a new lawn or a repair needs.Raised Bed Soil CalculatorWork out the soil, compost and sand to fill raised beds, and the length of timber to build the sides.Plant Spacing CalculatorCount how many plants fit in a bed or hedge at a given spacing, in a square grid or a staggered layout.Pond Liner CalculatorFind the size of liner for a garden pond from its length, width, depth and overlap, and an estimate of the water volume.
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Gidsen om eerst te lezen
Pythagoras' theorem explained with real-life uses
Learn a squared plus b squared equals c squared, find any side of a right-angled triangle, and use it for ladders, TVs, roofs and squaring.
UCAS Tariff points explained with grade tables
How UCAS Tariff points work for A levels, AS levels and the EPQ, with a grade table, worked examples such as ABB and A*AB, and what to check on offers.
MPG, litres per 100 km and fuel cost per mile explained
Work out your real mpg from a tank, convert mpg to litres per 100 km, and calculate fuel cost per mile and for a journey, with worked UK examples.