Free Online Calculators for Finance, Math, Health and Everyday Tasks

Search practical calculators, enter your values, and get clear results in seconds. Nothing is stored on a server, and every calculator keeps working offline.

Showing all 62 calculators.

Featured Utility

Universal Scientific Calculator

Deg Rad

Financial Calculators (see all 21)

🏡

Mortgage Calculator

Monthly payment, total interest and the real cost of a home loan.

📉

Amortization Calculator

How each payment splits between principal and interest, month by month.

💳

Loan Calculator

Repayment, interest and payoff cost for any fixed-rate loan.

💵

Payment Calculator

The fixed monthly payment behind any amount, rate and term.

🚗

Auto Loan Calculator

Car payment with deposit and trade-in, and what the interest adds.

💹

Interest Calculator

What a deposit earns under simple and compound interest.

📈

Compound Interest Calculator

Growth of a balance plus regular contributions, at any frequency.

📊

Interest Rate Calculator

Convert between nominal rate, APR and APY to compare offers.

📈

Investment Calculator

Portfolio value after years of contributions and compound growth.

🏖

Retirement Calculator

Your nest egg, the income it pays and the gap left over.

💰

Finance Calculator

Time value of money: solve for rate, term, payment or value.

💸

Inflation Calculator

What money is worth after years of rising prices.

💵

Salary Calculator

Hourly to annual pay and back, with holidays accounted for.

🧾

Income Tax Calculator

US federal tax by bracket, effective rate and take-home pay.

🏷

Sales Tax Calculator

Add tax to a net price or pull it back out of a gross total.

🏷

Discount Calculator

Sale price, savings and stacked discounts, in both directions.

🏦

Savings Calculator

What a plan grows to, or the deposit a target needs.

💳

Credit Card Payoff Calculator

How long a card balance takes, and what the interest costs.

📉

Debt Payoff Calculator

Snowball against avalanche on your own debts.

🏠

House Affordability Calculator

The price your income supports, by the 28/36 rules.

💼

401(k) Calculator

Balance at retirement and how much is the employer match.

Health & Fitness Calculators (see all 13)

🧍

BMI Calculator

Body mass index with WHO categories and your healthy range.

🧬

Body Fat Calculator

Body fat percentage by the US Navy tape method or BMI.

⚖

Ideal Weight Calculator

Healthy weight range across four clinical formulas.

🔥

BMR Calculator

Resting calorie burn and the daily total for your activity level.

🥗

Calorie Calculator

Daily calories to maintain, lose or gain weight.

🏃

Pace Calculator

Running pace, finish time and splits for any distance.

🤰

Pregnancy Calculator

How many weeks along you are and what comes next.

👶

Due Date Calculator

Estimated delivery date from LMP, conception or scan.

🌸

Conception Calculator

Ovulation day, fertile window and likely conception date.

🔥

TDEE Calculator

Everything you burn in a day, broken into its four parts.

🥗

Macro Calculator

Calories turned into grams of protein, carbs and fat.

🏋

One Rep Max Calculator

Your 1RM from any set, across five formulas.

🏃

Calories Burned Calculator

Calories for any activity, from published MET values.

Math & Statistics Calculators (see all 11)

🔢

Percentage Calculator

Four tools for every kind of percentage question.

➗

Fraction Calculator

Add, subtract, multiply and simplify fractions, with steps.

⚖

Ratio Calculator

Solve proportions, simplify ratios and scale recipes.

📐

Triangle Calculator

Sides, angles, area and hypotenuse from what you know.

📊

Standard Deviation Calculator

Mean, variance and both standard deviations, with working.

🔬

Scientific Calculator

Trigonometry, logs, powers, memory, history and keyboard input.

📊

Average Calculator

Mean, median, mode and range from one paste.

📐

Quadratic Formula Calculator

Roots, discriminant and vertex, with the steps.

🎲

Probability Calculator

Two events: both, either, neither, exactly one.

📏

Area Calculator

Nine shapes, metric and imperial, formula shown.

📦

Volume Calculator

Eight solids, in cubic units, litres and gallons.

Utilities & Tech Calculators (see all 17)

🎂

Age Calculator

Exact age in years, months and days, leap years included.

📅

Date Calculator

Days between dates, or add and subtract any period.

⏱

Time Calculator

Add and subtract hours, minutes and seconds.

💼

Work Hours Calculator

Weekly timesheet with breaks, overtime and gross pay.

🎓

GPA Calculator

Semester and cumulative GPA on the 4.0 scale.

📝

Grade Calculator

Your weighted grade and the final exam score you need.

🍽

Tip Calculator

Tip, rounding and splitting the bill any way you like.

🏗

Concrete Calculator

Cubic yards, cubic metres and bags for any pour.

🔄

Conversion Calculator

Length, weight, volume, area, speed and temperature.

🌐

Subnet Calculator

IPv4 CIDR, masks, host range and broadcast address.

🔒

Password Generator

Strong random passwords generated in your browser.

🎲

Random Number Generator

Secure random integers in any range, with or without repeats.

📐

Square Footage Calculator

Room area, waste allowance and material cost.

😴

Sleep Calculator

Bedtimes that land between sleep cycles, not inside one.

🏛

Roman Numeral Converter

Numbers to numerals and back, 1 to 3,999.

⛽

Fuel Cost Calculator

Trip cost from distance, economy and pump price.

🔢

Number Base Converter

Binary, octal, decimal, hex and any base to 36.

🪙 User Reward Points System

A light counter that goes up as you use the calculators. It lives in this browser only.

Your Balance 10 Points

ℹ️ Important Note on Tokens / Points: CalculatorTokens are non-monetary, internal gamification points stored locally in your browser. They are not cryptocurrencies, financial instruments, or tradeable assets, and hold zero monetary value. Points are earned purely by using the calculators, and they stay in this browser.

📄 Executive PDF Reports

Unlock clean, executive PDF exports across all financial calculators.

👑 Pro Supporter Badge

Display a verified gold Pro Supporter badge in your saved session profile.