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Calculators
Work out percentages, discounts, tips, ages and other everyday sums. Every calculator shows the formula it uses and a worked example, so you can check the answer by hand.
1–24 of 29 tools
Browse categories →Most searched in Calculators
Age Calculator
Calculate completed years, months and days from a date of birth.
Annual to Monthly Salary Calculator
Convert annual gross salary to an average monthly amount.
Biweekly to Annual Pay Calculator
Annualize a biweekly gross pay amount.
Concrete Calculator
Work out how much concrete you need for a slab or footing, in cubic yards and bags.
Discount Calculator
Calculate savings and final price after a percentage discount.
Discounted Unit Price Calculator
Calculate discounted unit price and total for a quantity.
Electricity Cost Calculator
Estimate energy charges using electricity consumption, a user-entered per-kWh tariff and fixed charges.
Final Grade Calculator
Find the score you need on the final exam to reach your target grade.
Flooring Calculator
Find how much flooring to buy, including a waste allowance and the number of boxes.
Fuel Cost Calculator
Estimate the fuel needed and cost of a trip from distance, fuel economy and price.
Gas Mileage Calculator
Work out gas mileage and cost per mile from your odometer readings and fill-up.
GPA Calculator
Calculate your semester or cumulative GPA on a 4.0 scale from letter grades and credits.
Grade Calculator
Find your weighted course grade from scores and category weights.
Hourly Overtime Pay Calculator
Estimate weekly gross pay with overtime above a selected hours threshold.
Love Calculator
Just for fun: enter two names and get a playful compatibility percentage.
MPG Calculator
Calculate miles per gallon from distance and fuel used, with litres per 100 km.
Mulch Calculator
Calculate how many cubic yards or bags of mulch cover a garden bed at your chosen depth.
Paint Calculator
Estimate how many gallons of paint a room needs, allowing for doors, windows and coats.
Percentage Calculator
Calculate a percentage of a value.
Percentage Change Between Two Values
Calculate absolute and percentage change between two values.
Percentage Increase Calculator
Calculate the absolute and percentage change between an original value and a new value.
Percentage of Total Calculator
Calculate one amount as a percentage of a total.
Sales Tax Exclusive Price Calculator
Remove a user-entered sales tax rate from a tax-inclusive amount.
Sales Tax Inclusive Price Calculator
Calculate a tax-inclusive price from a pre-tax price and user-entered rate.
About Calculators
This collection has 29 ready-to-use tools for calculators. Every tool runs in your browser, so the numbers you type are not sent to a server. Each page explains what to enter, shows the formula or method behind the result, and gives worked examples you can compare against your own figures.
Results are estimates for planning and comparison. Where rates, thresholds or rules change from year to year, the tool page states the tax year or assumptions it uses. Check them against an official source before you file, pay or sign anything.
Popular here: Percentage Calculator, Age Calculator, Discount Calculator, Tip Calculator, Simple Interest Calculator, Percentage Increase Calculator, Electricity Cost Calculator, Simple Interest Total Calculator.
Calculators FAQ
Are these calculators free?
Yes. Every calculator is free to use with no account, download or sign-up.
How do I check a calculator result?
Each tool page lists the formula and at least one worked example. Run the example values through the formula and compare them with the result on screen.
Is my data sent anywhere?
No. These tools run in your browser, so the values, text or files you enter stay on your device unless a tool page says otherwise.