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Calculators

Free Online Calculators

Free online calculators for finance, health, education, and everyday math. No sign-up required, instant results in your browser.

16 tools, all free, no sign-up

Calorie Calculator

Calculate your TDEE and daily calorie needs. Get personalized targets for weight loss, maintenance, or gain. Uses Mifflin-St Jeor and Harris-Benedict formulas.

CalculatorHealth

Paycheck Calculator

Calculate take-home pay after federal and state taxes, Social Security, Medicare, and pre-tax deductions. Supports hourly and salary with 2026 tax brackets.

CalculatorFinance

Compound Interest Calculator

Calculate compound interest growth with optional monthly contributions. Choose compounding frequency from daily to annually.

CalculatorFinance

Pregnancy Calculator

Calculate due date from last period or conception date. Track fetal development week by week with milestones.

CalculatorHealth

Macro Calculator

Calculate daily macros (protein, carbs, fat) based on TDEE and fitness goal. Supports cutting, bulking, maintenance with keto and low-carb presets.

CalculatorHealth

BMI Calculator

Calculate BMI in metric or imperial units. Get ideal weight range and health risk assessment based on BMI categories.

CalculatorHealth

Weighted Grade Calculator

Combine assignments by their assessment weight to get your class average, or work backwards to the final exam score you need. Editable grade scale.

CalculatorEducation

GPA Calculator

Calculate GPA on 4.0, 5.0, or percentage scale. Add multiple courses with credit hours. Instant GPA calculation.

CalculatorEducation

Dividend Calculator

Calculate dividend income, yield, and total return. Track quarterly and annual dividend payments.

CalculatorFinance

Loan Calculator

Calculate monthly payments for personal, auto, and student loans. View amortization schedule and see how extra payments save interest.

CalculatorFinance

Mortgage Calculator

Calculate monthly mortgage payment, total interest, and full amortization schedule. Enter loan amount, rate, and term.

CalculatorFinance

Tip Calculator

Calculate tip amount, total bill, and per-person share. Tip presets (10–25%), custom percentage, split between any number of people, and round-up-to-dollar toggle.

CalculatorFinance

Ovulation Calculator

Calculate ovulation date and fertile window from last period. Track best days to conceive for pregnancy.

CalculatorHealth

Retirement Calculator

Plan your financial future. Calculate retirement savings growth and monthly withdrawal amounts using the 4% rule.

CalculatorFinance

Percentage Calculator

Calculate percentages instantly, percent of a number, percentage change, discounts, and more.

Calculator

Age Calculator

Calculate your exact age in years, months, and days, plus total days lived and next birthday countdown.

Calculator
These calculators handle the everyday math people either forget the formula for or don't fully trust themselves to get right by hand: loan amortization, calorie needs, exam grade thresholds, exact age in days. They are built for anyone who wants a fast, checkable answer instead of building a spreadsheet from scratch: students, homeowners comparing loan offers, or parents tracking a pregnancy due date. A typical case: someone refinancing a mortgage wants to see the exact payment difference between a 15-year and a 30-year term before calling a lender, rather than re-deriving the amortization formula in a spreadsheet. Every calculator here uses a standard, publicly documented formula (Mifflin-St Jeor for calories, standard amortization for loans) and shows the full breakdown, not just a single number.

Frequently Asked Questions

Should I use the Loan Calculator or the Mortgage Calculator for a home loan?▾
Use the Mortgage Calculator for a home purchase, it is built around the amortization schedules typical of 15- and 30-year mortgage terms. Use the Loan Calculator for personal, auto, or student loans, which usually run on shorter terms.
What is the difference between the Grade Calculator and the GPA Calculator?▾
The Grade Calculator finds your weighted average within a single class from its assignments and exams. The GPA Calculator combines the final grades from multiple classes, weighted by credit hours, into one GPA.
Are these calculators accurate enough for real financial or medical decisions?▾
They use standard, publicly documented formulas and are accurate for planning purposes. For a final financial commitment or a medical decision, confirm the numbers with a lender, accountant, or doctor.
Are these Calculators tools free to use?▾
Yes, all 16 tools in this category are completely free. No sign-up, no account, and no payment required. Every tool works instantly in your browser.
Do these tools work on mobile phones?▾
Yes. All tools are mobile-responsive and work on iOS, Android, and desktop browsers. Touch events are supported where applicable.
Is my data sent to a server?▾
It depends on the tool, so each tool page says which it is. Most run entirely in your browser and send nothing. Some fetch public data to work, such as price charts and currency rates. A few, like the dynamic QR generator, need an account and store what you create, because that is the feature.
How many Calculators tools are available?▾
There are 16 tools in this category. All are free and require no sign-up. Browse the list above to find the tool you need.