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✨ 100% Free — No Sign Up Needed

Slick. Fast. Accurate.

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

🧮 18 Calculators & Growing
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🎓
College GPA
Weighted GPA with credit hours
3.50
Your Weighted GPA
Total Credits
—
Letter Grade
—
🏫
High School GPA
Regular & weighted (AP/Honors)
—
Unweighted GPA (out of 4.0)
Weighted GPA
—
Class Rank Est.
—
🏛️
College Cost
4-year total cost estimator
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Total Estimated Cost
Per Year
—
After Aid
—
📝
SAT ↔ ACT
Score converter & college readiness
—
Equivalent Score
Percentile
—
College Readiness
—
Full SAT & ACT Tool + College Matches →
🏠
Mortgage
Monthly payment + total interest
—
Monthly Payment (P&I)
Loan Amount
—
Total Interest
—
Total Cost
—
Payoff Year
—
🚗
Loan / Auto
Personal, auto & student loans
—
Monthly Payment
Total Paid
—
Total Interest
—
💸
Savings Growth
Compound interest calculator
—
Future Balance
Total Deposited
—
Interest Earned
—
🧾
Income Tax
Federal tax estimate 2026
—
Estimated Federal Tax
Effective Rate
—
Marginal Rate
—
Take-Home/yr
—
Take-Home/mo
—
⚖️
BMI Calculator
Body Mass Index + category
—
Your BMI Category
Healthy Range
—
Ideal Weight
—
🥗
Daily Calories
TDEE — maintain/lose/gain
—
Calories to Maintain Weight
To Lose 1lb/wk
—
To Gain 1lb/wk
—
Full Calorie & Macro Tool →
🍽️
Tip Calculator
Split the bill between friends
—
Per Person (including tip)
Tip Amount
—
Total Bill
—
🔢
Percentage
Discounts, increases & ratios
—
Result
Full Percentage Tool (6 calculators) →
🎂
Age Calculator
Exact age + birthday countdown

Find your exact age in years, months, days, hours and minutes. See how many days until your next birthday! 🎉

Open Age Calculator 🎂
💱
Currency Converter
Convert 30+ world currencies

Convert between USD, EUR, GBP, JPY, CAD, AUD, INR, CNY and 25+ more currencies. Quick reference rate table included.

Open Currency Converter 💱
🏫
HS GPA — Full Tool
Weighted + AP/IB/Honors + college guide

Full high school GPA calculator with weighted & unweighted GPA, grade reference chart, class rank estimate, and 4.0 vs 5.0 scale.

Open HS GPA Calculator 🏫
📝
SAT & ACT — Full Tool
Scores, percentiles + college matches

Full SAT & ACT calculator: section scores, national percentile rankings, college match tool (Reach / Match / Safety), and SAT↔ACT converter.

Open SAT & ACT Calculator 📝
🍎
Calorie & Diet — Full Tool
TDEE + macros + weight targets

Full calorie calculator with daily calorie needs, complete macro breakdown (protein, carbs, fat), and personalized weight loss or gain targets.

Open Calorie & Diet Calculator 🥗
📊
Percentage — Full Tool
6 calculators in one place

Six powerful percentage calculators: X% of Y, percentage change, increase by %, decrease by %, X is what % of Y, and reverse percentage.

Open Full Percentage Calculator 🔢
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Why Use SlickCalculator?

⚡
Instant Results
No loading, no waiting. Get your answer immediately.
🔒
100% Private
Your data never leaves your browser.
📱
Mobile Friendly
Works perfectly on any device.
🎯
Always Accurate
Built on current federal rates & IRS brackets.
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❓ Frequently Asked Questions

Everything you need to know about our free calculators

Are all the calculators completely free? +
Yes — 100% free forever. No sign-up, no subscription, no hidden fees. All 18 calculators work instantly in your browser.
How accurate is the mortgage calculator? +
Our mortgage calculator uses the standard amortization formula used by banks worldwide. The P&I calculation is mathematically precise. Always get a Loan Estimate from your lender for official numbers.
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 credit hours. Sum all quality points and divide by total credits.
Is my data private when I use the calculators? +
Absolutely. All calculations happen entirely in your browser. None of the numbers you enter is ever sent to our servers or stored anywhere.
What is a healthy BMI range for adults? +
According to the CDC: Underweight = Below 18.5 · Normal = 18.5–24.9 · Overweight = 25.0–29.9 · Obese = 30.0+. BMI is a useful screening tool but does not account for muscle mass.
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