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Calculators

EMI, BMI, percentages, units, currency, and compound interest.

61 free calculators on Omnipus. No account needed. Tools run in your browser unless the badge on the tool page says it fetches a URL or uses a public API.

Percentage calculatorWhat is x% of y, x is what percent of y, and percent change.BMI calculatorCompute body mass index in metric or imperial units.Age calculatorFind exact age in years, months, and days from a date of birth.EMI calculatorEstimate monthly loan payments, total interest, and payoff amount.Unit converterConvert length, weight, temperature, area, volume, speed, and data.Currency converterConvert between world currencies using ECB reference rates.Compound interestProject how savings grow with compounding and regular deposits.Tip calculatorCalculate tip, tax, and per-person split from a restaurant bill.Scientific calculatorEvaluate expressions with sin, cos, tan, log, and powers.GPA calculatorAverage letter grades with credit hours.Calorie calculatorEstimate daily calories with Mifflin-St Jeor.Discount calculatorSee the sale price and how much you save.Sales tax calculatorAdd or remove sales tax from a price.Hourly to salaryConvert an hourly wage to a yearly salary (and back).VAT calculatorAdd or extract VAT at 5, 10, 20% or a custom rate.Profit marginCompute margin and markup from cost and sell price.Aspect ratioSimplify width × height and scale to a target side.Number base converterConvert between binary, octal, decimal, and hex.Pace calculatorFind run pace, time, or distance from the other two.Grade calculatorWeighted grades: what do you need on the final?Random numberDraw cryptographically random integers in a range.Fuel costEstimate trip fuel cost from distance, MPG, and price.Mortgage calculatorMonthly payment, interest, and payoff for a home loan.Simple interestI = P × r × t, plus the total amount due.Date differenceDays, weeks, and months between two dates.Time zone converterConvert a time between IANA zones.Unix timestampConvert epoch seconds to a date, and back.Days untilCountdown in days to a target date.Countdown timerCount down to a date and time in this tab.StopwatchStart, pause, and lap a stopwatch.

Data unit converterConvert bytes, MB, GB, TB, and network transfer speeds (Mbps).Pet food & plant safety checkerSearch 150+ foods, plants, and household items for dog and cat safety status — general reference only, not a veterinary diagnosis.Screen resolutionSee viewport and screen size in CSS pixels, device pixel ratio, and orientation.Device benchmarkScore this phone, tablet, or desktop with a rough 0–100 in-browser benchmark.Resistor color codeRead a 4-band resistor from band colors.Ohm’s lawSolve V = I × R. Enter any two values.Luhn checksumValidate a card, IMEI, or other Luhn number.ISBN checkerValidate ISBN-10 and ISBN-13 checksums.VIN checkerCheck a 17-character vehicle identification number.IBAN checkerValidate an IBAN with mod-97.Moon phaseSee the lunar phase for any date.Sleep cycle calculatorWake at the end of a 90-minute cycle.TDEE calculatorEstimate daily calories with Mifflin-St Jeor.Water intakeA starting daily water target from body weight.Dog age calculatorEstimate dog years to human years with size-aware curves — for curiosity, not medical advice.Cat age calculatorEstimate cat years as human-age equivalents with indoor/outdoor curves — general info only.Due dateEstimate a due date from last period or conception.Split the billDivide a check with tip and optional tax.Paint calculatorHow many gallons for walls, given coats and coverage.Tile calculatorTiles needed for a floor or backsplash, plus waste.LED resistorPick the series resistor for an LED from supply, Vf, and current.Ovulation calculatorEstimate ovulation and a fertile window from cycle length.Next paydayFind the next Friday, or the next 1st and 15th.Wind chillNOAA wind-chill from air temperature and wind speed.Heat indexHow hot it feels from temperature and relative humidity.Sunrise & sunsetApproximate sunrise and sunset for a date and lat/long.LCM & GCDLeast common multiple and greatest common divisor of two integers.Hours calculatorAdd start and end times with unpaid breaks and get total hours in h:mm and decimal.Date calculatorFind the date 90 days from today, subtract weeks or months, or count days between two dates.Fraction calculatorAdd, subtract, multiply, and divide fractions and mixed numbers — simplified, mixed, and decimal answers with steps.Statistics calculatorPaste numbers to get mean, median, mode, range, sample and population standard deviation, and variance.