Free Calculators — Grades, Pay, Loans and Retirement
Every calculator here runs entirely in your browser. Nothing you type is uploaded, stored or shared, and none of them asks you to create an account.
Each one also explains the arithmetic it performs, because a number without its reasoning is difficult to check and impossible to argue with. If a result looks wrong, the working is on the page so you can find out why.
- 23
- Calculators
- 4.0
- Standard US scale
- 0
- Data collected
- Free
- No sign-up
Grade point average
Convert letter grades to grade points, weighted by credit hours.
GPA Calculator
Semester or cumulative GPA on the standard 4.0 scale, weighted by credit hours.
Weighted GPA Calculator
High school GPA with the Honors and AP bump applied, shown beside the unweighted figure.
Course grades
Work out where you stand, and what the next exam has to deliver.
Final Grade Calculator
The score you need on the final exam to reach your target course grade.
Semester Grade Calculator
Your current grade from weighted categories, with ungraded work excluded properly.
Pay and hours
Convert between salary and hourly pay, and check what a long week is worth.
Salary to Hourly Calculator
What an annual salary pays per hour once your real weekly hours are counted.
Hourly to Salary Calculator
An hourly wage as annual, monthly and weekly pay, with unpaid weeks handled.
Overtime Pay Calculator
Straight time and time-and-a-half split at the federal forty-hour threshold.
Loans and saving
What a loan costs, what paying extra is worth, and how long a goal takes.
Student Loan Payment Calculator
The monthly payment on a loan, plus the total repaid and how much is interest.
Student Loan Payoff Calculator
How much sooner the loan clears if you pay extra, and the interest that saves.
Savings Goal Calculator
How long a savings target takes at your contribution and account return.
Borrowing
What a car or a house actually costs each month, once tax, fees and insurance are in.
Auto Loan Calculator
A car payment from the drive-away cost — sales tax, dealer fees, trade-in and all.
Mortgage Payment Calculator
The full monthly payment: principal, interest, property tax, insurance, HOA and PMI.
Refinance Savings Calculator
The break-even month against closing costs, and what resetting the term really costs.
Rent Affordability Calculator
Affordable rent against both the income rule and the debt-to-income test landlords use.
Getting out of debt
How long a balance takes to clear, and which debt to attack first.
Credit Card Payoff Calculator
A fixed payment against the minimum-only path, with the interest total for each.
Debt Snowball Calculator
Snowball against avalanche across every debt — payoff order, finish date and cost.
Emergency Fund Calculator
The fund your household needs from essential spending, and how long it takes to build.
Growth and retirement
What compounding does over a long horizon, and whether the pot supports the income.
Compound Interest Calculator
A balance with regular contributions, and how much of the total is growth rather than yours.
401(k) Calculator
Projected balance with the employer match, raises and growth — plus the match you are missing.
Retirement Savings Calculator
The income a projected pot supports, and the extra monthly saving that closes any gap.
Hours and rates
Totalling a timesheet, and pricing self-employed work honestly.
Time Card Calculator
A week of shifts with breaks, split into regular and overtime — midnight crossings included.
Freelance Hourly Rate Calculator
The rate self-employed work has to charge once tax, expenses and unbillable hours are counted.
Which calculator answers which question
These tools fall into two families, and picking the wrong one is the usual reason a result looks strange.
For grades: use the GPA calculator for the average across courses already completed, the weighted version when a US high school adds points for Honors, AP, IB or dual-enrollment work, the semester calculator to find where you currently stand across weighted categories, and the final grade calculator to see what one upcoming exam has to deliver.
For pay: convert in the direction you are being quoted. A salary becomes an hourly rate when you want to know what your time is really worth; an hourly rate becomes an annual figure when you are comparing an offer against a salaried job. The overtime calculator answers a narrower and more legal question — what a week beyond forty hours is worth — and the raise calculator turns a percentage into the monthly difference it makes.
Most of these look backwards at something already settled. The final grade and raise calculators look forwards, and those are the two worth running early, while the answer can still change a decision.
Why everything runs in your browser
None of these tools has a server component. The arithmetic is small enough to run as JavaScript on the page, so there is nothing to send anywhere and nothing to store.
That is partly a privacy decision. Grades are personal, and a resume pasted into a keyword checker is often an unpublished document naming a current employer. Neither belongs in somebody else database, least of all in exchange for a percentage.
It also means the tools keep working offline once the page has loaded, respond instantly rather than waiting on a round trip, and never gate a result behind an email address. If a calculator asks who you are before it will show you a number, that is a sign the number is not the product.
Each page shows the formula it uses, so you can check any result by hand.
Frequently asked questions
Yes, all of them, with no account and no limit on use. They run as JavaScript in your browser, so there is no server cost per calculation to pass on.
No. Every calculation happens locally in your browser. Your grades and any text you paste are never transmitted to us, and nothing persists once you close the tab.
They follow the standard US conventions, which cover most cases. Institutions vary at the edges — A+ handling, weighting rules, repeat policies — so each page states the convention it uses and points out where your school may differ.
Yes. Every calculator is responsive and works in a mobile browser, including in dark mode. No app or download is involved.