Free Online Calculators

Most popular

Highest-demand tools in this category.

• Age Calculator

  Calculate age in years, months, and days from a date of birth.

• BMI Calculator

  Calculate body mass index from weight (kg) and height (cm) with WHO adult categories.

• Currency Converter

  Convert between currencies using editable exchange rates (illustrative defaults vs USD).

• Mortgage Calculator

  Estimate mortgage payments from property price, down payment, rate, and term.

• EMI Calculator

  Calculate equated monthly installments (EMI) for a fixed-rate loan or purchase plan.

• Percentage Calculator

  Find X% of Y, what percent one number is of another, or percent change.

• Compound Interest Calculator

  Project savings growth with compound interest and optional regular contributions.

• Loan Calculator

  Estimate monthly payments, total interest, and payoff cost for a fixed-rate amortizing loan.

Date & time

Add days, find differences, and work with calendars when scheduling matters.

• Countdown Timer

  Live countdown to a target date and time — days, hours, minutes, and seconds.

• Week Number

  Find the ISO week number (1–53) for any date.

• Date Difference

  Calculate the number of days, weeks, and hours between two dates.

• Time Zone Meeting Planner

  Convert a meeting time between two fixed UTC offsets (no live DST lookup).

• Hours to Decimal

  Convert hours and minutes to decimal hours for timesheets.

• Decimal to Hours

  Convert decimal hours back to hours and minutes.

• Hours & Minutes Adder

  Add two durations in hours and minutes and see the total.

Health & fitness

BMI, macros, water intake, and similar planning numbers — not medical diagnoses.

• Ovulation Calculator

  Estimate ovulation day and fertile window from period start and cycle length.

• Calorie Deficit Calculator

  Compare TDEE and intake to estimate daily/weekly deficit and rough kg change.

• Pregnancy Due Date Calculator

  Estimate a due date from the last menstrual period (LMP) using Naegele’s rule.

• BMR & TDEE Calculator

  Estimate basal metabolic rate and daily calories (TDEE) using Mifflin–St Jeor.

• Pace Calculator

  Calculate running or walking pace, speed, and finish time from distance and time.

• Macro Calculator

  Split daily calories into protein, carbs, and fat grams from percent targets.

• One Rep Max Calculator

  Estimate one-rep max (1RM) from a weight and rep count using the Epley formula.

• Ideal Weight Calculator

  Estimate ideal body weight with the Devine formula from height.

• Protein Intake Calculator

  Estimate daily protein grams from body weight and grams-per-kg target.

• Water Intake Calculator

  Estimate daily water needs from body weight and activity minutes.

• Sleep Cycle Calculator

  Suggest wake times based on ~90-minute sleep cycles from your bedtime.

• VO2 Max Cooper Calculator

  Estimate VO₂ max from a 12-minute Cooper run distance.

• Body Fat Navy Calculator

  Estimate body-fat percent with the US Navy circumference method (informational).

• Pace Split Calculator

  Generate even kilometer (or custom) splits from race distance and target pace.

• Calories from Macros

  Convert protein, carb, and fat grams into total calories (4/4/9).

Money & business

EMI, mortgage, interest, and money math for rough comparisons before you commit.

• Inflation Calculator

  See how inflation changes the future value of money over a number of years.

• Tip Calculator

  Calculate tip amount and split a bill between people.

• VAT Calculator

  Add or extract VAT/GST from an amount using a percentage rate.

• Fuel Cost Calculator

  Estimate trip fuel use and cost using L/100km or MPG plus fuel price.

• Sales Tax Calculator

  Add sales tax to a net price or extract tax from a tax-inclusive total.

• CAGR Calculator

  Calculate compound annual growth rate from start value, end value, and years.

• Discount Calculator

  Discount Calculator shows the savings and final price for one original price and one percent. It does not stack discounts or add sales tax.

• Simple Interest Calculator

  Simple Interest Calculator uses I = P times r times t, with r as an annual percent, and shows interest and total. It does not compound.

• ROI Calculator

  Calculate return on investment from amount invested and amount returned.

• Pay Raise Calculator

  Calculate the raise amount and new pay from current pay and raise percent.

• Hourly to Salary Calculator

  Convert an hourly wage to weekly, monthly, and annual salary estimates.

• Salary to Hourly Calculator

  Convert annual salary to an equivalent hourly rate from hours/week and weeks/year.

• APR / Effective Rate Calculator

  Convert a nominal APR into an effective annual rate given compounding frequency.

• Profit Margin Calculator

  Find profit and margin percent from revenue and cost.

• Net Worth Calculator

  Subtract liabilities from assets for a quick net-worth snapshot.

• Electricity Bill Calculator

  Estimate an electricity bill from kWh usage, rate per kWh, and optional fixed fee.

• Markup Calculator

  Calculate selling price from cost and markup percent.

• Debt Payoff Calculator

  Estimate months, total paid, and interest to clear a balance with fixed monthly payments.

• Amortization Schedule Calculator

  Calculate monthly loan payment and preview the amortization schedule.

• Commission Calculator

  Calculate sales commission from revenue and rate, with optional base pay.

• Savings Goal Calculator

  Estimate months to reach a savings goal with monthly contributions and optional return rate.

• Unit Price Calculator

  Find price per unit from pack price and quantity — compare grocery and bulk deals.

• Salary Converter

  Convert between hourly, daily, weekly, monthly, and yearly pay.

• Overtime Pay Calculator

  Estimate regular and overtime pay from hourly rate, hours, OT threshold, and multiplier.

• Rule of 72 Calculator

  Estimate years for an investment to double at a given annual return percent.

• Payback Period Calculator

  Estimate how many years to recover an investment from steady annual cash flow.

• Break-Even Calculator

  Estimate units needed to cover fixed costs given price and variable cost per unit.

• Meeting Cost Calculator

  Estimate the cost of a meeting from attendees, average hourly rate, and duration.

• Refinance Break-even Calculator

  Find how many months until refinance closing costs are offset by lower payments.

• Discount Stack Calculator

  Apply multiple discounts in order to see the final price and total savings.

• Tip on Taxed Bill Calculator

  Calculate tip and grand total with tax, tipping on pre-tax or post-tax amount.

• Monthly vs Annual Savings

  Compare paying monthly vs yearly for a subscription and see which saves money.

Math & conversions

Percentages, unit-style math, and other quick arithmetic helpers.

• GPA Calculator

  Calculate weighted GPA from course grades and credits on a 4.0, 5.0, or percentage scale.

• Dice Roller

  Roll one or more dice with a chosen number of sides using secure browser randomness.

• Unit Converter

  Convert length, weight, temperature, area, volume, speed, and data storage units.

• Aspect Ratio Calculator

  Simplify width×height to a ratio like 16:9 and show the decimal.

• DPI Calculator

  Calculate DPI/PPI from pixel count along one side and physical size in inches.

• Fraction Converter

  Convert fractions to decimal/percent, or approximate a decimal as a fraction.

• Grade Calculator

  Compute a weighted grade from scores and matching weights.

More calculators

Additional tools in this category.

• Number Base Converter

  Convert numbers between binary, octal, decimal, and hexadecimal.

• Tip Split Calculator

  Calculate tip, total bill, and equal per-person share.

• Margin Markup Converter

  Convert between profit margin percent and markup percent.

• Paycheck Calculator

  Paycheck Calculator turns an hourly rate and hours into regular pay, overtime pay, and a net after the withholding percent you type. It does not look up tax tables.

• Time Card Calculator

  Time Card Calculator adds clock-in and clock-out times for the week, subtracts unpaid breaks, and splits hours after the overtime threshold. Overnight shifts are not counted.

Calculators FAQ

Are calculator results official?

No. They follow common formulas for planning. Confirm loans with your lender and health numbers with a professional.

Do you store my inputs?

Calculators run locally in your browser. Values stay in the tab.

EMI vs loan vs mortgage calculator?

Names differ by market and loan type. Use the page that matches your product terms, and align tenure and rate format with your offer letter.