CALCULATORS
Finance, math, date, and everyday calculators. Pick one below — every one of them runs right in your browser, nothing is uploaded.
Finance & Money
Discount Calculator
Find the final price and total savings from one or two stacked discounts.
Sales Tax Calculator
Add sales tax to a price, or extract it from a tax-included total.
Tip Calculator
Calculate a tip from a bill total and split it across any number of people.
Compound Interest Calculator
Project investment growth with compounding frequency and regular contributions.
APR Calculator
Calculate the true Annual Percentage Rate from your loan amount, interest rate, term, and upfront fees.
Investment Return Calculator
Calculate total return percentage, CAGR, and profit from an investment — from final value or annual return rate.
ROI Calculator
Calculate Return on Investment as a percentage from cost and profit, or initial and final values, with optional annualized ROI.
Loan Payment Calculator
Calculate monthly loan payments, total interest, and a payoff amortization summary.
Salary Calculator
Convert between hourly, daily, weekly, monthly, and annual pay.
Mortgage Calculator
Calculate a monthly mortgage payment, total interest, and payoff amount.
VAT Calculator
Add or remove VAT from a price at any rate, with the tax amount shown separately.
Tax Percentage Calculator
Find the effective tax rate from a pre-tax and post-tax amount, or apply a rate forward.
Markup Calculator
Calculate selling price, markup percentage, or cost from any two of the three.
Margin Calculator
Calculate gross profit margin, profit, or selling price from cost and revenue.
Break-Even Calculator
Find the break-even unit volume and revenue from fixed costs, price, and variable cost.
Mortgage Overpayment Calculator
See how much interest you save and how many years you cut from your mortgage by making regular monthly overpayments.
Interest Rate Calculator
Find the interest rate from a loan amount, payment, and term — or calculate the monthly payment from a rate.
Math & Education
Percentage Calculator
Find X% of Y, what percent X is of Y, or the change between two numbers.
Average Calculator
Find the mean, median, mode, and range of a list of numbers.
Fraction Calculator
Add, subtract, multiply, or divide fractions, with simplified and decimal results.
GPA Calculator
Calculate GPA from course grades and credit hours, on a 4.0 scale.
Date & Time
Days Until Calculator
See how many days, weeks, and months until (or since) a date.
Leap Year Calculator
Check if a year is a leap year and why, plus the next five leap years.
Business Days Calculator
Count working days between two dates, or add/subtract business days from a date, with optional holidays to exclude.
Date Difference Calculator
Find the days, weeks, months, and years between two dates.
Time Calculator
Add or subtract hours, minutes, and seconds, or find the duration between two times.
Time Zone Converter
Convert a date and time between two time zones and see the UTC offset.
Health & Fitness
BMI Calculator
Calculate Body Mass Index from height and weight, metric or imperial.
BMR Calculator
Calculate Basal Metabolic Rate and TDEE with the Mifflin-St Jeor formula.
Everyday & Unit Conversion
Fuel Cost Calculator
Estimate a trip's fuel cost from distance, fuel economy, and price per liter or gallon.
Unit Price Calculator
Compare price per unit across package sizes to find the better deal.
Currency Converter
Convert an amount between two currencies using an exchange rate you enter.
Questions
- Are these calculators actually free?
- Yes, all of them. No account, no daily limit, no premium tier — use as many calculators as you need, as often as you need.
- Is my financial or personal data uploaded to a server?
- No. Every calculator here runs entirely in your browser — nothing you type is ever transmitted or stored.
- Which calculator should I use for loans or interest?
- Loan Payment Calculator gives you the monthly payment and total interest on a fixed-rate loan; Compound Interest Calculator projects savings growth with regular contributions.
- Do you have date and time calculators too?
- Yes — Age Calculator, Date Difference Calculator, Days Until Calculator, Leap Year Calculator, and Time Calculator all live in this category alongside the finance and math tools.