30 free tools · No signup · With formulas
Free calculatorsthat show their working.
Work out loan payments, savings, BMI, calories, dates and more. Every result comes with the formula behind it and a worked example, so you can check the answer yourself.
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- 30
- Calculators
- Words per guide
- 1,000+
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- Free to use
- 100%
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What do you need to work out?
30 of 30 calculators
BMI Calculator
Know your Body Mass Index in seconds — with healthy-range context.
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Percentage Calculator
What is X% of Y? What % is X of Y? Answered with steps.
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Percentage Increase / Decrease Calculator
Old → new percent change, with increase vs decrease explained.
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Age Calculator
Exact age in years, months, days — plus totals and next birthday.
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Date Difference Calculator
Days between dates — with weekdays, weekends and inclusive counts.
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Time Calculator
Hours between times, shift lengths and add-duration maths.
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Discount Calculator
Sale price, savings and stacked discounts — with optional tax.
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Tip Calculator
Fair tips and clean bill splits — per-person totals included.
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Loan Calculator
Monthly payment, total interest and true cost of any loan.
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EMI Calculator
Equated Monthly Instalment for home, car and personal loans.
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Compound Interest Calculator
Growth on growth — future value with contributions shown yearly.
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Simple Interest Calculator
Linear interest on principal — loans, deposits and late fees.
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GST Calculator
Add or strip GST — net, tax, gross plus CGST/SGST split.
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Fraction Calculator
Add, subtract, multiply, divide and simplify fractions exactly.
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Average Calculator
Mean, median, range and count — paste any number list.
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SIP Calculator
See what a monthly mutual fund SIP could grow to — with optional yearly step-up.
Open calculatorFD Calculator
Fixed deposit maturity value and interest, with quarterly or monthly compounding.
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Recurring deposit maturity value for a fixed monthly saving, compounded quarterly.
Open calculatorMortgage Calculator
Monthly home payment with principal, interest, property tax, insurance and PMI.
Open calculatorCAGR Calculator
Compound annual growth rate between two values — investments, revenue or anything that grows.
Open calculatorProfit Margin Calculator
Margin, markup and profit from cost and price — or the price you need for a target margin.
Open calculatorCalorie Calculator
Daily calories to maintain, lose or gain weight — BMR and TDEE using Mifflin–St Jeor.
Open calculatorBody Fat Calculator
Estimate body fat percentage with a tape measure — the U.S. Navy circumference method.
Open calculatorIdeal Weight Calculator
Healthy weight range for your height, plus the Devine, Robinson, Miller and Hamwi formulas.
Open calculatorWaist-to-Height Ratio Calculator
Keep your waist to less than half your height — check your ratio against NICE bands.
Open calculatorStandard Deviation Calculator
Sample and population standard deviation, variance and mean for any list of numbers.
Open calculatorLCM & GCF Calculator
Least common multiple and greatest common factor of up to 20 numbers, with Euclid's steps.
Open calculatorRatio Calculator
Simplify ratios, solve proportions (a:b = c:x) and split a total in any ratio.
Open calculatorAdd or Subtract Days Calculator
Add or subtract days, weeks, months or years from a date — or count business days only.
Open calculatorWork Hours Calculator
Weekly timesheet: hours worked minus breaks, overtime and pay — overnight shifts included.
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The calculators are grouped into four categories: money, maths, health and dates.
Good places to start
Three calculators people use most often
The compound interest calculator shows how savings grow over time. The GST calculator adds or removes GST from a price. The age calculator gives an exact age in years, months and days. Each comes with a guide of about 1,000 words.
- Each result shows the formula and the steps
- Worked examples use realistic numbers
- Your numbers stay on your device
About DailyCalc
Why we show the working
Many calculator sites give you a number and nothing else. That's fine for a quick sum, but not when the number is a loan repayment or a health measure. Each of our 30 calculators shows the formula it uses, works through an example, explains when the result is useful and lists the mistakes people commonly make.
Before a calculator goes live, its maths is tested against known correct answers. Each guide also lists the sources it was checked against, such as the WHO, the Reserve Bank of India, the CDC, the GST Council and the US Consumer Financial Protection Bureau, so you can look them up yourself.
People use the site for all sorts of everyday questions: checking a stacked discount at the checkout, comparing two loan offers, confirming a school admission cut-off date, or working out a rent rise as a percentage.
What every calculator page includes
- 1The calculator. Enter your numbers and get the result, with a clear message if an input is wrong.
- 2Formula and example. The formula explained, plus a worked example using realistic numbers.
- 3A short guide. How to use it, when it helps, tips and common mistakes.
- 4Sources. The references we checked it against, and the date it was last updated.
Questions
Platform FAQ
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