๐ŸŽ“ Education ๐Ÿ’ฐ Financial โค๏ธ Health โšก Everyday
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Slick. Fast. Accurate.

Free calculators for school, money, health & everyday life. Get instant answers without the hassle.

๐Ÿงฎ 12 Calculators & Growing
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College GPA
Weighted GPA with credit hours
3.50
Your Weighted GPA
Total Credits
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Letter Grade
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High School GPA
Regular & weighted (AP/Honors)
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Unweighted GPA (out of 4.0)
Weighted GPA
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Class Rank Est.
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College Cost
4-year total cost estimator
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Total Estimated Cost
Per Year
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After Aid
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SAT โ†” ACT
Score converter & college readiness
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Equivalent Score
Percentile
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College Readiness
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Mortgage
Monthly payment + total interest
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Monthly Payment (P&I)
Loan Amount
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Total Interest
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Total Cost
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Payoff Year
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Loan / Auto
Personal, auto & student loans
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Monthly Payment
Total Paid
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Total Interest
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Savings Growth
Compound interest calculator
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Future Balance
Total Deposited
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Interest Earned
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Income Tax
Federal tax estimate 2024
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Estimated Federal Tax
Effective Rate
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Marginal Rate
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Take-Home/yr
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Take-Home/mo
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BMI Calculator
Body Mass Index + category
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Your BMI Category
Healthy Range
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Ideal Weight
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๐Ÿฅ—
Daily Calories
TDEE โ€” calories to maintain/lose/gain
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Calories to Maintain Weight
To Lose 1lb/wk
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To Gain 1lb/wk
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๐Ÿฝ๏ธ
Tip Calculator
Split the bill between friends
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Per Person (including tip)
Tip Amount
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Total Bill
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%๏ธ
Percentage
Discounts, increases & ratios
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Result
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Why Use SlickCalculator?

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Instant Results
No loading, no waiting. Get your answer immediately.
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100% Private
Your data never leaves your browser.
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Mobile Friendly
Works perfectly on any device.
๐ŸŽฏ
Always Accurate
Built on current federal rates & IRS brackets.
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๐Ÿ“š Financial & Education Blog

Guides and tips to help you make smarter financial decisions

๐Ÿ 
Mortgage Guide

How Much House Can I Afford in 2026?

The 28/36 rule is the golden standard for home affordability. Your monthly mortgage should not exceed 28% of gross monthly income, and total debt should stay under 36%. On a $7,000/month income, target mortgage payment is around $1,960. Current 30-year rates sit at 7.0โ€“7.2% in 2026, meaning a $400,000 home with 20% down costs roughly $2,150/month in principal and interest.

โฑ 3 min read
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GPA Guide

What GPA Do You Need For Medical, Law & Business School?

Medical schools typically require a minimum 3.5 GPA, with top programs averaging 3.9. Law schools like Yale and Harvard Law look for 3.8+. Top MBA programs average around 3.6. Your GPA is crucial but just one factor โ€” test scores, research experience, and personal statements matter equally. Use our GPA calculator to track your standing and set realistic targets.

โฑ 4 min read
๐Ÿ’ณ
Debt Guide

Debt Avalanche vs Snowball: Which Method Wins?

The debt avalanche pays highest-interest debt first โ€” saving the most money mathematically. The snowball pays smallest balances first โ€” giving psychological wins and better completion rates. Credit card rates average 20โ€“25% in 2026. Mathematically avalanche wins, but the best method is whichever you actually stick to. Use our debt payoff calculator to compare both strategies.

โฑ 5 min read
๐ŸŒด
Retirement Guide

How Much Do You Really Need to Retire Comfortably?

The 4% rule says you can safely withdraw 4% of savings annually over 30 years. Need $60,000/year? You need $1.5 million saved. Fidelity recommends 10x your final salary by age 67. Starting at 25 vs 35 can mean $300,000+ more in retirement savings even contributing less โ€” thanks to the magic of compound interest over time.

โฑ 4 min read
๐Ÿงพ
Tax Guide

2026 Federal Tax Brackets Explained Simply

The US uses a progressive tax system โ€” different rates on different income portions. For 2026 single filers: 10% on first $11,600 ยท 12% to $47,150 ยท 22% to $100,525 ยท 24% to $191,950 ยท 32% to $243,725 ยท 35% to $609,350 ยท 37% above. Standard deduction is $14,600 single, $29,200 married. Our tax calculator uses these exact brackets for instant estimates.

โฑ 3 min read
โš–๏ธ
Health Guide

Is BMI Actually a Good Measure of Health?

BMI is a useful screening tool but has real limitations. It does not distinguish between muscle and fat โ€” a muscular athlete may show "overweight" despite being very healthy. The CDC recommends using BMI alongside waist circumference, blood pressure, and cholesterol for a complete picture. Normal BMI is 18.5โ€“24.9. Our free BMI calculator gives instant results with your healthy weight range.

โฑ 3 min read
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โ“ Frequently Asked Questions

Everything you need to know about our free calculators

Are all the calculators completely free? +
Yes โ€” 100% free forever. No sign-up, no subscription, no hidden fees. All calculations happen instantly in your browser and your data is never stored or shared with anyone.
What is the current federal interest rate in 2026? +
As of 2026, the Federal Reserve federal funds rate is in the 4.25โ€“5.50% range. Average 30-year fixed mortgage rate is approximately 7.0โ€“7.2%. Auto loan rates average 7.5% for new vehicles. Always check with your lender for the most current rates.
How accurate is the mortgage calculator? +
Our mortgage calculator uses the standard amortization formula used by banks worldwide โ€” the P&I calculation is mathematically precise. Property tax and insurance are estimates. Always get a Loan Estimate from your lender for official numbers before making decisions.
How is GPA calculated on a 4.0 scale? +
GPA is calculated by multiplying each course grade (A=4.0, B=3.0, C=2.0, D=1.0, F=0.0) by the credit hours. Sum all quality points and divide by total credits. Example: A in 3-credit course = 12 pts + B in 4-credit course = 12 pts. Total 24 รท 7 credits = 3.43 GPA.
What is compound interest and why does it matter? +
Compound interest means you earn interest on your interest. $10,000 at 7% annual interest grows to $19,672 after 10 years with compound interest vs $17,000 with simple interest. Over 30 years, that same $10,000 becomes $76,123. Starting early is the most powerful thing you can do for your financial future.
How much should I tip in 2026? +
Standard US tipping in 2026: Sit-down restaurants โ€” 18โ€“20% for good service, 25%+ for exceptional. Fast casual โ€” 10โ€“15% optional. Food delivery โ€” 15โ€“20%, minimum $3โ€“5. Bartenders โ€” $1โ€“2 per drink or 15โ€“20% of tab. Use our tip calculator to split any bill instantly.
Is my data private when I use the calculators? +
Absolutely. All calculations happen entirely in your browser. None of the numbers you enter โ€” income, loan amount, GPA, weight, or any personal data โ€” is ever sent to our servers or stored anywhere. Your data stays 100% private on your device.
What is a healthy BMI range for adults? +
According to the CDC and WHO: Underweight = Below 18.5 ยท Normal = 18.5โ€“24.9 ยท Overweight = 25.0โ€“29.9 ยท Obese = 30.0+. BMI is a useful screening tool but does not account for muscle mass or body composition. Always discuss with your healthcare provider for a complete assessment.

๐Ÿ’ก Quick Financial Tips

Actionable advice to improve your financial health today

๐Ÿ  Mortgage Tip

A 1% lower mortgage rate on a $400,000 loan saves over $80,000 over 30 years. Shop at least 3 lenders and compare offers. Even 0.25% less makes a significant difference to your total interest paid.

๐Ÿ’ธ Savings Tip

Pay yourself first โ€” automate savings before you spend. Just $100/month starting at 25 grows to over $262,000 by age 65 at a 7% average annual return. Time is your greatest financial asset.

๐Ÿ’ณ Debt Tip

Credit card rates average 20โ€“25% in 2026. Paying only the minimum on a $5,000 balance at 22% takes over 20 years and costs $7,000+ in interest. Always pay more than the minimum every month.

๐Ÿงพ Tax Tip

Maxing your 401k ($23,000 in 2026) reduces taxable income dollar for dollar. In the 22% bracket that is $5,060 in annual tax savings โ€” plus the investment grows tax-deferred until retirement.

๐ŸŽ“ Student Loan Tip

Federal undergrad loan rates for 2025โ€“2026 are 6.53%. Income-driven repayment plans cap payments at 10% of discretionary income and forgive remaining balances after 20โ€“25 years of qualifying payments.

๐ŸŒด Retirement Tip

A 25-year-old saving $300/month will have significantly more than a 35-year-old saving $600/month โ€” even contributing less total. The power of starting early cannot be overstated for long-term wealth building.

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