Calculators

Loans, mortgages, health, dates, and percentages — calculated instantly, with no sign-up and nothing ever uploaded.

Tools

Percentage Calculator

Find a percentage of a number, what percent one number is of another, percent increase/decrease, or the original number before a percentage was applied.

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Loan Calculator

Calculate your monthly payment, total payment, and total interest for a fixed-rate loan.

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Mortgage Calculator

Estimate your monthly principal and interest payment on a home loan.

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BMI Calculator

Calculate your Body Mass Index (BMI) in metric or imperial units and see the standard adult category.

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Age Calculator

Find the exact age between a date of birth and any target date, in years, months, and days.

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Discount Calculator

Find the amount saved and the final price after a percentage discount.

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Tip Calculator

Calculate a tip amount and total bill, and optionally split it evenly between everyone at the table.

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Split Bill Calculator

Split a bill evenly between any number of people, with an optional tip.

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Percentage Change Calculator

Find the percent increase or decrease from a starting value to a final value.

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Percentage Difference Calculator

Find the percentage difference between two values using the standard average-based formula.

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Scientific Calculator

A general-purpose calculator with real operator precedence, parentheses, trig, logarithms, powers, roots, and calculation history.

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Aspect Ratio Calculator

Simplify a width and height to its aspect ratio, or calculate a missing width or height from a chosen ratio — supports common presets like 16:9 and 4:3.

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GPA Calculator

Calculate your GPA on the standard 4.0 scale from your courses' credit hours and grades, with an optional previous GPA for a new cumulative GPA.

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Days Between Dates Calculator

Find the exact duration between two dates in years, months, days, and total days — or add or subtract days from a date.

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Grade Calculator

Calculate your final weighted percentage and letter grade for a subject or exam from each graded item's score and weight.

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Fraction Calculator

Add, subtract, multiply, or divide fractions and mixed numbers, or simplify a fraction to its lowest terms — exact integer math, no rounding errors.

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Amortization Schedule Calculator

See the full payment-by-payment amortization schedule for a fixed-rate loan: principal, interest, and remaining balance for every payment.

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Extra Payment Calculator

See how much time and interest you'd save by paying extra toward principal every month on a fixed-rate loan.

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Margin & Markup Calculator

Calculate profit margin and markup from cost and price, or find the selling price for a target margin or markup.

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TDEE Calculator

Estimate your Total Daily Energy Expenditure (TDEE) and Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation.

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Why these tools run entirely in your browser

Loan amounts, income, health details — the numbers you'd plug into a calculator are often personal. Every calculation here runs locally in JavaScript; nothing is uploaded, logged, or stored.