31 free tools · Everyday Calculators
Free online
Everyday Calculators.
Quick, private calculators for everyday maths: percentages, percentage change, discounts and sale prices, time and date differences. Answers as you type, with the working shown and nothing sent to a server.
Browse 31 toolsEveryday Calculators
31 tools · Free to use
Percentage Calculator
Free percentage calculator: find X% of Y, what percent X is of Y, percentage change, and the whole from a part. Answers with steps and Excel formulas.
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Percentage Increase Calculator
Calculate the percentage increase between two numbers, increase a number by a percent, or find the original value. Instant answers with steps.
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Percentage Decrease Calculator
Find the percentage decrease between two numbers, reduce a number by a percent, or find the value before a decrease. Free, with steps and formulas.
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Percentage Change Calculator
Calculate the percentage change between an old and new value, with the working shown, percent vs percentage points, and an Excel formula.
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Percentage Difference Calculator
Find the percentage difference between two numbers using their average as the reference, with the working, an Excel formula, and when to use it.
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Discount Calculator
Calculate the sale price and savings for any percent off, stack extra discounts, add sales tax, or find the original price. Free and instant.
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Date Calculator
Add or subtract days, weeks, months or years from any date, count business days only, or find the time between two dates. Free, instant, with the weekday shown.
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Days Between Dates Calculator
Count the days between two dates or until a date, with results in years, months, weeks, and weekdays. Optionally include the end date. Free.
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Business Days Calculator
Count business days between two dates, skipping weekends, US federal or UK bank holidays, and your own days off. Free and instant.
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Age Calculator
Calculate your exact age in years, months, and days, your age on any date, total days lived, and the countdown to your next birthday. Free.
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Time Calculator
Add and subtract hours and minutes, total up a list of times, or add a duration to a clock time. Results in h:mm, decimal hours and minutes. Free and instant.
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Hours Calculator
Calculate the hours and minutes between two times, subtract a break, handle overnight shifts and get decimal hours and pay. Free, instant and private.
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Time Card Calculator
Free weekly time card calculator: clock-in and clock-out times with breaks, overnight shifts, overtime and pay, rounding, and CSV export.
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Military Time Converter
Convert military time to standard time and back instantly: 1730 = 5:30 PM. Full military time chart, how to say it, and the current time in military format.
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Square Footage Calculator
Calculate square footage for rooms, floors, and lots. Combine rectangles, circles, and triangles, subtract cut-outs, and convert to m² or acres.
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Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals to numbers instantly, from 1 to 3,999,999, with a step-by-step breakdown and validity check. Free.
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Roman Numeral Date Converter
Convert any date to Roman numerals for tattoos, rings and wedding gifts. Choose US, UK or ISO order and dot, bullet, dash or slash separators. Free, instant.
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Binary Calculator
Free binary calculator: add, subtract, multiply and divide binary numbers, plus AND, OR, XOR, NOT and bit shifts. Results in binary, decimal, hex and octal.
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Hex Calculator
Free hex calculator: add, subtract, multiply and divide hexadecimal numbers, plus AND, OR, XOR, NOT and shifts. Results in hex, decimal, binary and octal.
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Ratio Calculator
Free ratio calculator: simplify ratios like 24:36 to 2:3, solve A:B = C:?, split a total in any ratio and resize while keeping the aspect ratio. With steps.
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Average Calculator
Paste a list of numbers to get the average (mean), median, mode, range and standard deviation, or work out a weighted average for grades. Free, instant.
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Margin Calculator
Calculate profit margin from cost and price, or the selling price you need for a target margin. See profit and markup side by side, with formulas. Free.
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Markup Calculator
Calculate the selling price from cost and markup, or the markup percentage from cost and price. Compare with profit margin instantly, with Excel formulas.
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Overtime Calculator
Calculate overtime pay at time-and-a-half or any multiplier, plus double time. See regular, overtime and total pay before tax, with the working shown. Free.
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Hourly to Salary Calculator
Convert an hourly wage to annual salary, plus monthly, biweekly, weekly and daily pay. Adjust hours per week and paid weeks per year. Free, instant, private.
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Salary to Hourly Calculator
Convert an annual salary to an hourly wage for any hours per week and paid weeks per year. See monthly, biweekly and weekly pay too. Free and private.
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Electricity Cost Calculator
Work out how much an appliance costs to run per day, month and year from its watts, hours of use and your price per kWh. Heaters, AC, PCs and more. Free.
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Water Intake Calculator
Estimate how much water to drink a day from your weight, exercise and climate, in ounces, litres, cups and bottles. Free and private, with the formula shown.
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One Rep Max Calculator
Estimate your one rep max (1RM) from any set of 1–15 reps using the Epley, Brzycki and Lombardi formulas, with a training percentage chart. lb or kg. Free.
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Dog Age Calculator
Convert dog years to human years by size (small, medium, large or giant) using the AVMA chart plus the newer epigenetic formula, with life stage. Free.
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BTU Calculator
Find the BTU and AC size you need for a room from its size, ceiling height, sun exposure, occupants and use as a kitchen. Recommends a standard AC size. Free.
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A quick guide
Choosing the right Everyday Calculators
Everyday calculators should answer a question in seconds, show how they got there, and not need an account. Every calculator here updates as you type, explains the steps in plain English, and gives you a formula you can paste into Excel or Google Sheets.
All calculations run in your browser, so the numbers you enter, such as prices, salaries and dates, stay on your device.
Digital ToolPad brings together 31 free Everyday Calculators in one collection. Open a tool, add your input, and review the result on your device. All tool processing happens in your browser, without uploading your data to our servers for processing.
Are these calculators free?
Yes. There is no sign-up, no usage limit and no premium tier. Every calculator works immediately in your browser.
Can I see how the answer was calculated?
Yes. Each result has a plain-English sentence and a “Show working” section with the steps and a matching Excel or Google Sheets formula.
Is anything I type stored or sent anywhere?
No. Calculations happen on your device. The numbers you enter are not sent to a server or saved.
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