7Calculator Documentation

Learn how to get the most out of 7Calculator's financial, health, math, and everyday calculators.

Welcome to the documentation for 7Calculator.

7Calculator is a collection of free online calculators designed to help you quickly answer everyday questions about money, health, math, and time.

This documentation gives you a high-level overview of the main calculator categories and how to use them effectively.

Financial calculators

Use the financial calculators when you want to understand:

How much a loan or mortgage will cost over time
How savings and investments can grow
How interest rates, tax, and inflation affect your money

Common calculators include:

Loan & Auto Loan – Estimate monthly payments, total interest, and amortization schedules.
Mortgage – Compare different loan terms, down payments, and rates before buying a home.
Compound Interest & Investment – See how one-time deposits and recurring contributions grow.
Income Tax & Salary – Approximate after-tax income and understand how tax rates impact take-home pay.
Sales Tax, VAT, Percent Off – Quickly work out final prices and discount effects.

For detailed, step-by-step examples, see the blog articles on loan calculations and compound interest.

Fitness & health calculators

These calculators give you rough health-related estimates that are easy to interpret:

BMI & Body Fat – Screen for general weight categories and approximate body fat levels.
Calorie, BMR, TDEE, Macro – Estimate energy needs and macro splits for weight loss, maintenance, or muscle gain.
Pace & One Rep Max – Convert workouts into pace/speed metrics and estimate strength benchmarks.
Pregnancy & Due Date – Get approximate dates and week counts for pregnancy timelines.

Important: health calculators are not medical devices. Always talk to a healthcare professional for diagnosis or treatment.

Math calculators

The math tools are useful for homework, quick checks, and technical work:

Scientific – General-purpose calculator with trig, logs, powers, and more.
Fraction & Percentage – Work with ratios, discounts, and proportional changes.
Standard Deviation & Statistics – Summarize data sets and analyze spread and averages.
Triangle, Circle, Distance, Volume – Solve common geometry and measurement problems.

Most math calculators also include short explanations under the result area to help you interpret the output.

Other calculators

The “other” category includes everyday utilities such as:

Date, Time, Hours, Time Duration – Add/subtract days, compute time differences, and convert hours to decimal.
GPA & Grade – Aggregate scores across assignments and courses.
Concrete, Roofing, Tile, Mulch, Gravel – Estimate material quantities for basic home projects.
Subnet, Bandwidth, Voltage Drop, Ohm’s Law – Networking and electrical helpers.

These tools are designed to be practical and focused. If you have an idea for a new calculator, you can reach out via the contact page.

How results should be used

All calculators on 7Calculator:

Use widely known formulas and typical assumptions
Are approximations, not guarantees
Do not replace professional financial, legal, or medical advice

You should always:

Double-check results when they affect important decisions
Combine calculator output with your own judgment and expert input
Treat the tools as a way to build intuition, not as final authority

Next steps

Visit the Calculators page to browse all tools.
Read the Blog for deeper explanations and worked examples.
Check the Privacy Policy and Terms of Service to understand how 7Calculator works behind the scenes.

If you have feedback or feature requests, we’d love to hear from you. 7Calculator is built to make your day-to-day calculations faster and clearer.