All Calculators

• Simpson’s Rule Calculator

  Approximate a definite integral with Simpson's 1/3 or 3/8 rule, showing each point, its weight, the step size and an estimated error.

• Sine Cosine Tangent Calculator

  Find all six trigonometric ratios for any angle, or work backwards from a ratio to the angle, with exact values at the…

• Sleep Calculator

  Bedtimes and wake-up times in whole sleep cycles, checked against the hours you actually need — so a neatly timed six hours…

• Slope Calculator

  Find the slope between two points, or the angle and grade it corresponds to, along with the full equation of the line.

• Slugging Percentage Calculator

  Slugging percentage from at-bats, hits, doubles, triples and home runs, with total bases, batting average and isolated power.

• Sodium Intake Calculator

  Sodium and salt converted properly — the 2.54 factor comes from atomic masses, and mistaking one for the other is out by…

• Soffit Calculator

  Work out the soffit panels and J-channel for your eaves, and how much vented soffit gives enough attic intake air under the…

• Soil Yard Calculator

  Convert bags of soil to cubic yards or yards to bags for any bag size, and compare the cost of bagged soil…

• Specific Heat Calculator

  Calculate the heat needed to warm a material, the temperature change from an amount of heat, or the mass or specific heat,…

• Speed Converter

  Convert speeds between km/h, mph, metres per second, knots and feet per second, with pace and travel time.

• Sphere Calculator

  Find a sphere's volume, surface area, radius, diameter or circumference from any one of them, with the working shown.

• Spray Foam Insulation Calculator

  Work out the board feet of open-cell or closed-cell spray foam to reach a target R-value, with thickness, kits to buy and…

• Square Feet to Square Meters Calculator

  Convert square feet to square metres exactly, from an area or a room's length and width, with a price per square foot…

• Square Root Calculator

  Find the square root of any number, simplified into exact surd form where possible, with the decimal value alongside.

• Squat Standards Calculator

  See how your squat compares with strength standards for your bodyweight and sex, from Beginner to Elite, and what the next level…

• Stair Calculator

  Number of risers and treads, riser height, total run, stringer length and angle for a straight stair, with a comfort and code…

• Stairmaster Calorie Calculator

  Estimate calories burned on a StairMaster or stepmill from your weight, steps per minute, step height and workout time, with floors climbed.

• Standard Deviation Calculator

  Find the sample or population standard deviation of a list of numbers, with the mean, variance and every step of the working.

• Standard Error Calculator

  Find the standard error of a mean from data or from a standard deviation and sample size, or the standard error of…

• Steps to Calories Calculator

  Estimate calories burned from your step count, height, weight and walking pace, with the distance walked and calories per 1,000 steps.

• Steps to Miles Calculator

  Convert steps to miles and kilometres from your height or measured stride, with steps per mile and the distance of 10,000 steps.

• Stock Return Calculator

  Price return and total return side by side, because every price chart leaves the dividends out — and over decades they are…

• Stone to Pounds Calculator

  Convert stone, or stone and pounds, to pounds and kilograms, as body weight is often given in the UK and Ireland.

• Stud Calculator

  Studs and plates for a framed wall at 16 or 24 in or metric centres, counted as spaces plus one, with extras…

• Student Budget Calculator

  Plan a monthly student budget from job, family and aid income against rent, food and other costs, with the term total.

• Student Loan Calculator

  See what a student loan really costs once interest accrued during study capitalises — and what the subsidised label is worth in…

• Study Time Calculator

  Estimate weekly study hours from your credit load with the 2-for-1 rule, or plan daily revision hours before an exam.

• Subcooling Calculator

  Calculate HVAC subcooling from liquid line pressure and temperature for R-410A, R-22 or R-134a, and compare it with the target charge.

• Subscription Cost Calculator

  Add up your monthly and annual subscriptions to see the true monthly and yearly cost, the share of your income, and what…

• Sugar Conversion Calculator

  Convert sugar between cups, spoons, grams and ounces for granulated, caster, brown, icing sugar, honey and maple syrup, with substitution tips.

• Sunrise Sunset Calculator

  Find sunrise, sunset, solar noon, day length and civil twilight for any date and place, in the local time zone with daylight…

• Superheat Calculator

  Calculate HVAC superheat from suction pressure and suction line temperature for R-410A, R-22 or R-134a, with a fixed-orifice target.

• Surface Area Calculator

  Find the surface area of a box, cube, sphere, cylinder, cone, pyramid, prism or hemisphere, with each face listed separately.

• Sweat Rate Calculator

  Work out your sweat rate from your weight before and after exercise, the fluid you drank and any urine, with a drinking…

• Swimming Pace Calculator

  Work out swimming pace per 100 metres or yards from a time and distance, the time for a race at a pace,…

• Syllable Counter

  Count the syllables in any word, sentence or poem, word by word and line by line, with the average syllables per word.

• System of Equations Calculator

  Solve two or three simultaneous linear equations, with the determinant, the elimination steps, and the parallel and coincident cases explained.

• T-Test Calculator

  Run a one-sample, two-sample (Welch) or paired t-test, with the t statistic, degrees of freedom, p-value and a confidence interval.

• Tablespoon to Teaspoon Calculator

  Convert tablespoons to teaspoons and back, for US, UK or Australian tablespoons, with the volume in millilitres.

• Target Heart Rate Calculator

  Moderate and vigorous heart rate zones by the Karvonen method or percent of maximum, kept apart, with the weak link — the…

• TDEE Calculator

  Daily calorie burn, and which half of the estimate carries the error — the activity guess is worth several times more than…

• Temperature Converter

  Convert temperatures between Celsius, Fahrenheit, kelvin and Rankine, as readings or as temperature differences.

• Test Score Calculator

  Turn the number of questions wrong or right into a test percentage and letter grade, and see how many you can miss…

• Text Case Converter

  Convert text to UPPER CASE, lower case, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case or CONSTANT_CASE.

• Thermal Expansion Calculator

  Calculate how much a length of metal, glass or concrete expands or shrinks with temperature, or how much a liquid's volume changes.

• Tile Calculator

  Tiles and boxes for a floor or wall from the area and tile size, counted with the grout joint and a waste…

• Time Addition Calculator

  Add up a list of times and durations — like 1:45, 2h 30m or 50m — or subtract some, to get the…

• Time Card Calculator

  Total a week of shifts from start and end times and breaks, split regular and overtime hours, and work out pay with…

• Time Converter

  Convert time between seconds, minutes, hours, days, weeks and years, with a days-hours-minutes breakdown.

• Time Division Calculator

  Divide a duration by a number to split it into equal parts, or by another duration to see how many times it…

• Time Duration Calculator

  Find the exact duration between two times to the second — in hours, minutes and seconds, h:mm:ss, decimal hours and total seconds.

• Time Multiplication Calculator

  Multiply a duration in hours, minutes and seconds by any number, such as a 1:45:30 task repeated 6 times, with the total…

• Time Off Calculator

  Count the workdays and PTO hours a vacation will use between two dates, excluding weekends and public holidays, and see what is…

• Time Zone Converter

  Convert a date and time between world time zones — London, New York, Karachi, Dubai, India, Tokyo and more — with daylight…

• Timecode Calculator

  Add, subtract and convert SMPTE timecode at 23.976, 24, 25, 29.97 drop-frame, 30, 50, 59.94 or 60 fps, with frame counts and…

• Timesheet Calculator

  Total timesheet entries by client, project or task, round them to a billing increment, and work out the amount at an hourly…

• Tip Calculator

  Work out the tip on a bill, split the total between any number of people, and see the per-person share instantly.

• Tire Size Calculator

  The diameter, sidewall height, circumference and revolutions per km of a tire from its size, and how a new size compares.

• Tons to Yards Calculator

  Convert tons of gravel, sand, soil, mulch or other bulk material to cubic yards, with how much area that covers at common…

• Topsoil Calculator

  Topsoil for a lawn or garden bed from the area and depth: cubic yards or m³ with settling included, the weight, bags,…

• Torque Calculator

  Calculate torque from force, lever arm and angle, or the force or wrench length needed for a torque, in N·m, lb·ft and…

• Training Max Calculator

  Work out your 5/3/1 training max from your one rep max, or from a set, with every week's working weights rounded to…

• Trapezoid Calculator

  Find the area, perimeter and median of a trapezoid from its two parallel sides and either the height or the two slanted…

• Trapezoidal Approximation Calculator

  Estimate a definite integral with the trapezoidal rule from a function or from a table of data with uneven spacing, with left,…

• Treadmill Incline Calculator

  See what a treadmill incline is worth: the flat-ground speed it equals, the extra effort and calories, and the vertical climb, from…

• Treadmill Pace Calculator

  Convert treadmill speed in km/h or mph to running pace per km or mile, or pace to speed, with the flat-ground equivalent…

• Triangle Calculator

  Solve any triangle from three sides, two sides and the angle between them, or two angles and a side — with area,…

• Triathlon Calculator

  Predict your triathlon finish time from swim pace, bike speed and run pace for sprint, Olympic, half or full distance, with transitions…

• Trigonometric Identities Calculator

  Evaluate and check the main trigonometric identities at your angles: Pythagorean, double angle, half angle, and sum and difference formulas.

• Trigonometry Calculator

  Solve any triangle by the law of sines or cosines — including the ambiguous SSA case, where two different triangles can fit…

• Tuition Cost Calculator

  Estimate the full cost of a degree from tuition, fees, housing, books and other costs, with yearly increases and grants taken off.

• Turkey Cooking Time Calculator

  Roasting time for a whole turkey by weight, stuffed or unstuffed, at 325 °F, with the safe temperature, resting, thawing time and…

• TV Size and Distance Calculator

  The best viewing distance for your TV size, or the best TV size for your seating distance, with screen dimensions and when…

• Typing Speed Calculator

  Work out your typing speed in words per minute, gross and net of errors, with accuracy and how long an essay would…

• UK Capital Gains Tax Calculator

  Capital gains tax at 18% and 24%, with the basic rate band shared between your income and your gain — which is…

• UK Income Tax Calculator

  Income tax and National Insurance with the thresholds as inputs — including the 60% band between £100,000 and £125,140 that no table…

• UK Stamp Duty Calculator

  Stamp duty band by band, with the additional property surcharge and the one real cliff: first-time buyer relief, which vanishes rather than…

• Unit Converter

  Convert length, weight, volume, area, temperature, speed and time between metric and imperial units, with the exact factor.

• Unix Timestamp Converter

  Convert a Unix timestamp (seconds or milliseconds since 1970) to a date and time in UTC and any time zone, or a…

• US Capital Gains Tax Calculator

  Federal tax on a gain, with the 0/15/20 bands stacked the way they really work — and the room left in the…

• US Income Tax Calculator

  Federal income tax and FICA, with the bracket myth settled by computing take-home either side of a crossing rather than asserting it.

• Variance Calculator

  Find the sample or population variance of a list of numbers, with a table of deviations and squared deviations and the standard…

• VAT Calculator

  Add or remove VAT, work out a VAT return, and test the flat rate scheme against standard accounting — including the point…

• Vehicle Diminished Value Calculator

  Estimate a car's diminished value after an accident with the 17c formula, from its pre-accident value, damage severity and mileage.

• Vehicle Scrap Value Calculator

  Break down the scrap value of a car, truck, van or motorcycle by metal: steel, aluminum and copper, plus the battery and…

• Velocity Calculator

  Calculate velocity from distance and time, or the final velocity after accelerating for a time or over a distance, in any speed…

• Video Bitrate Calculator

  The file size of a video from its bitrate and length, or the video bitrate needed to hit a target file size.

• VO2 Max Calculator

  Estimate your VO2 max from a Cooper 12-minute run, a 1.5-mile run, the Rockport walking test or your resting and maximum heart…

• Voltage Divider Calculator

  Work out the output voltage of a two-resistor voltage divider, or the second resistor needed for a target output, with current and…

• Volume Calculator

  Find the volume of a box, cube, sphere, cylinder, cone, pyramid, prism or hemisphere — with the answer converted to litres and…

• Volume Converter

  Convert volumes between millilitres, litres, cubic metres, US and UK gallons, pints, cups, fluid ounces and spoons.

• Wage Garnishment Calculator

  Work out the most that can be garnished from your wages under US federal limits for consumer debts, student loans and child…

• Wainscoting Calculator

  Work out the panels or boards for wainscoting around a room, less doors, with chair rail and baseboard trim, at a height…

• Waist to Height Ratio Calculator

  Keep your waist under half your height. One threshold for everyone — no sex adjustment, no population table, no percentile chart.

• Waist to Hip Ratio Calculator

  Waist divided by hips against the WHO thresholds, plus waist-to-height — because a ratio of two girths cannot see how big you…

• Walking Calorie Calculator

  Estimate calories burned walking from your weight, speed, incline and time or distance, using the ACSM walking equation.

• Walking Time Calculator

  Work out how long a walk will take from the distance, your pace and any climbing, with the number of steps and…

• Wallpaper Calculator

  Rolls of wallpaper for a room counted by full-height drops, with the pattern repeat included — the detail that area-based estimates miss.

• Water Intake Calculator

  How much to drink, separated from total water intake — because roughly a fifth of it arrives in food, which is what…

• Water Usage Calculator

  Estimate your household's daily water use from showers, baths, toilets, laundry, dishwasher and garden, with the monthly cost.

• Watts to Horsepower Calculator

  Convert watts to mechanical, metric and electrical horsepower exactly, with kilowatts and the energy used in an hour.

• Wavelength Calculator

  Calculate the wavelength of light, radio or sound from its frequency and wave speed, or of a photon from its energy, with…

• Wedding Budget Calculator

  Split a wedding budget across venue and catering, photography, attire, flowers, music, rings and more, with the cost per guest and a…

• Week Number Calculator

  Find the ISO week number of any date, with the week's Monday-to-Sunday dates and the US week number — or the dates…

• Weight Converter

  Convert weights between milligrams, grams, kilograms, tonnes, ounces, pounds, stone and US and UK tons.

• Weight Loss Percentage Calculator

  Work out what percentage of your body weight you have lost, how far you are toward your goal and your weekly rate…

• Weight Loss Timeline Calculator

  How long to reach a goal weight at a given calorie deficit, simulated week by week as your energy needs fall —…

• Weighted Average Calculator

  Find the weighted average of a list of values from their weights, such as grades by credit or percentage, with the working…

• Weighted GPA Calculator

  Work out your weighted high school GPA with extra points for honors and AP, IB or dual-enrollment classes, plus the unweighted GPA.

• Well Drilling Cost Calculator

  Estimate the cost of drilling a water well from its depth and price per foot, with casing, pump system, permit and water…

• Wilks Calculator

  Work out your Wilks and DOTS scores from your powerlifting total and bodyweight, to compare strength across weight classes.

• Win Percentage Calculator

  Win percentage from wins, losses and ties, the season pace, and games behind the leader, for any team or player.

• Wind Chill Calculator

  The wind chill temperature from air temperature and wind speed, in metric or imperial units, with the frostbite risk.

• Wire Calculator

  Find the copper or aluminum wire size for a circuit from its amps, length and voltage, checking ampacity and keeping voltage drop…

• Word Count to Pages Calculator

  Convert a word count into pages for single, 1.5 or double spacing in Times New Roman, Arial or Calibri, or pages back…

• Word Counter

  Count words, characters, sentences and paragraphs in any text, with reading and speaking time and the most used words.

• Work Calculator

  Calculate the work done by a force over a distance at any angle, or the force or distance for a given amount…

• Workers Compensation Calculator

  Estimate weekly workers' compensation wage-loss benefits from your average weekly wage, state limits and time off, for total or partial disability.

• Working Capital Calculator

  Working capital, current ratio and quick ratio from current assets, current liabilities and inventory, with what the ratios mean.

• Working Hours Calculator

  Find hours worked per day, week and year from start and end times and unpaid breaks, including overnight shifts, with optional pay.

• Workout Volume Calculator

  Add up the total volume of a workout, sets × reps × weight for every exercise, with total sets, reps and each…

• Wrapping Paper Calculator

  Work out the size of wrapping paper sheet a box needs, how many sheets a roll gives and how many rolls to…

• Yards of Gravel Calculator

  Find how many cubic yards of gravel a rectangle, circle or triangle needs, with the order size, wheelbarrow loads and pickup trips.

• Yards to Tons Calculator

  Convert cubic yards of gravel, sand, soil or other bulk material to tons and pounds, with pickup and dump truck loads to…

• Years Between Dates Calculator

  Find the number of years between two dates — whole years, decimal years and years, months and days — with the leap…

• Yeast Conversion Calculator

  Convert between instant, active dry and fresh yeast in grams, teaspoons or packets, with how to use each type.

• Z-Score Calculator

  Find the z-score of a value from the mean and standard deviation, or the value for a z-score, with the normal percentile…