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Prime Calculator - Free Online Calculators
🔍

Free Online Calculators for Every Need

Financial planning, investments, retirement, lifestyle & more. 100% free, no signup required. Fast, accurate, and always available.

💰 Financial Calculators

📊

401k Calculator

Retirement contribution planning

Calculate Now
🏠

Mortgage

Monthly mortgage payments

Calculate Now
📈

Compound Interest

Investment growth calculator

Calculate Now
💳

Credit Card Payoff

Debt repayment strategy

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🏦

Retirement Savings

Retirement fund growth

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💰

Salary Paycheck

Net take-home pay

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🎯 Utility & Lifestyle

💵

Tip Calculator

Gratuity and bill total

Calculate Now
🐕

Dog Age Calculator

Dog age to human years

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💱

Currency Converter

Global currency exchange

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⚖️

Proportion Calculator

Ratio and proportion solver

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📚

GPA Calculator

Academic GPA calculator

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🚀

Elon Earning Ticker

Real-time wealth tracker

Calculate Now

Why Use Our Free Calculators?

Our collection of online calculators offers accurate, instant results powered by professional mathematical formulas. Whether you're planning finances, managing student loans, calculating investments, or solving everyday problems, we have the tool you need.

Key Features

Every calculator is designed with simplicity and accuracy in mind. No registration, no hidden fees, and no complications. Our calculators work on any device—desktop, tablet, or mobile. Results appear instantly after entering your values. All calculations are based on proven mathematical formulas used by professionals in finance, engineering, and education.

Popular Calculators

Mortgage Calculator

Calculate your monthly mortgage payments based on loan amount, interest rate, and term. Understand the total interest you'll pay over the life of your loan. Make informed decisions before purchasing your home.

Retirement Planning Calculator

Plan your retirement savings by entering your current age, desired retirement age, expected annual returns, and monthly contributions. See how your investments will grow and whether you're on track for your retirement goals.

Compound Interest Calculator

Discover the power of compound interest on your investments. Enter your initial investment, monthly contributions, interest rate, and time horizon. Watch your money grow exponentially over time.

401k Retirement Calculator

Plan your 401k contributions and employer matching. Calculate how much you need to save monthly to reach your retirement goal. Understand the impact of employer matching on your nest egg.

Tip Calculator

Instantly calculate tip amounts and split bills among friends. Choose your tip percentage and number of people. Perfect for restaurants, services, and group outings.

Who Uses Our Calculators?

Students rely on our calculators for homework and learning. Teachers use them in classrooms. Business professionals calculate financial projections. Homeowners plan renovations and purchases. Investors track returns. Freelancers manage income and expenses. Families budget household costs. Anyone can use our tools for accurate, instant calculations.

Accuracy & Reliability

All calculations use industry-standard formulas and up-to-date rates. Results are verified and tested regularly. We prioritize accuracy and reliability in every tool. Your data is secure and private—nothing is stored after you close the page.

Common Questions

Are these calculators free?

Yes, 100% free with no hidden costs or subscription fees.

Do I need an account?

No, use our calculators instantly without registration or login.

Are the calculations accurate?

Yes, all calculations use professional mathematical formulas verified for accuracy.

Do you save my data?

No, your calculations are not saved. Complete privacy and security guaranteed.

Can I use on mobile?

Yes, all calculators are fully responsive and work perfectly on any device.

Need Custom Web Solutions?

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🧮 Live Calculator Instant & Free
0
`; break;case 'mortgage': title.innerHTML = "🏠 Mortgage Calculator"; body.innerHTML = `
`; break;case 'compound': title.innerHTML = "📈 Compound Interest"; body.innerHTML = `
`; break;case 'tip': title.innerHTML = "💵 Tip Calculator"; body.innerHTML = `
`; break;case 'salary': title.innerHTML = "💰 Salary Paycheck"; body.innerHTML = `
`; break;case 'dogage': title.innerHTML = "🐕 Dog Age"; body.innerHTML = `
`; break;case 'currency': title.innerHTML = "💱 Currency Converter"; body.innerHTML = `
`; break;case 'proportion': title.innerHTML = "⚖️ Proportion Calculator"; body.innerHTML = `
`; break;case 'gpa': title.innerHTML = "📚 GPA Calculator"; body.innerHTML = `
`; break;case 'elon': title.innerHTML = "🚀 Elon Earnings"; body.innerHTML = `

Elon earns approximately $438 per second.

Earnings Since Opening
$0.00
0 seconds
`; startElonTicker(); break; }overlay.classList.add('active'); }function closeModal() { document.getElementById('appModalOverlay').classList.remove('active'); if (window.elonInterval) clearInterval(window.elonInterval); }function closeModalOnOverlay(e) { if (e.target.classList.contains('modal-overlay')) closeModal(); }// CALCULATORS function run401kCalc() { const salary = parseFloat(document.getElementById('c401_salary').value) || 0; const contrib = (parseFloat(document.getElementById('c401_contrib').value) / 100) || 0; const match = (parseFloat(document.getElementById('c401_match').value) / 100) || 0; const years = parseFloat(document.getElementById('c401_years').value) || 0; const rate = (parseFloat(document.getElementById('c401_return').value) / 100) || 0;const annual = salary * contrib; const employerMatch = annual * match; const total = annual + employerMatch; let fv = 0;for (let i = 0; i < years; i++) { fv = (fv + total) * (1 + rate); }const box = document.getElementById('res401k'); box.style.display = 'block'; box.innerHTML = `
Projected Balance
$${Math.round(fv).toLocaleString()}
Includes employer match
`; }function runMortgageCalc() { const price = parseFloat(document.getElementById('mort_price').value) || 0; const down = parseFloat(document.getElementById('mort_down').value) || 0; const rate = (parseFloat(document.getElementById('mort_rate').value) / 100) / 12; const n = (parseFloat(document.getElementById('mort_term').value) || 30) * 12;const P = price - down; const monthly = (P * rate * Math.pow(1 + rate, n)) / (Math.pow(1 + rate, n) - 1); const totalInterest = (monthly * n) - P;const box = document.getElementById('resMort'); box.style.display = 'block'; box.innerHTML = `
Monthly Payment
$${monthly.toFixed(2)}
Total Interest: $${Math.round(totalInterest).toLocaleString()}
`; }function runCompoundCalc() { const P = parseFloat(document.getElementById('cmp_init').value) || 0; const PMT = parseFloat(document.getElementById('cmp_monthly').value) || 0; const rate = (parseFloat(document.getElementById('cmp_rate').value) / 100) / 12; const months = (parseFloat(document.getElementById('cmp_years').value) || 0) * 12;let balance = P; let contributed = P;for (let i = 0; i < months; i++) { balance = (balance + PMT) * (1 + rate); contributed += PMT; }const box = document.getElementById('resCmp'); box.style.display = 'block'; box.innerHTML = `
Future Value
$${Math.round(balance).toLocaleString()}
Interest Earned: $${Math.round(balance - contributed).toLocaleString()}
`; }function runTipCalc() { const bill = parseFloat(document.getElementById('tip_bill').value) || 0; const pct = (parseFloat(document.getElementById('tip_pct').value) / 100) || 0; const people = parseInt(document.getElementById('tip_people').value) || 1;const tip = bill * pct; const total = bill + tip; const perPerson = total / people;const box = document.getElementById('resTip'); box.style.display = 'block'; box.innerHTML = `
Per Person
$${perPerson.toFixed(2)}
Tip: $${tip.toFixed(2)} | Total: $${total.toFixed(2)}
`; }function runSalaryCalc() { const gross = parseFloat(document.getElementById('sal_gross').value) || 0; const freq = parseInt(document.getElementById('sal_freq').value) || 26; const tax = (parseFloat(document.getElementById('sal_tax').value) / 100) || 0;const net = gross * (1 - tax); const paycheck = net / freq;const box = document.getElementById('resSalary'); box.style.display = 'block'; box.innerHTML = `
Net Take-Home
$${paycheck.toFixed(2)}/check
Annual: $${Math.round(net).toLocaleString()}
`; }function runDogCalc() { const age = parseFloat(document.getElementById('dog_age').value) || 0; const size = document.getElementById('dog_size').value;let humanYears = 0; if (age <= 1) humanYears = 15; else if (age <= 2) humanYears = 24; else { let mult = 4; if (size === 'medium') mult = 5; else if (size === 'large') mult = 6; else if (size === 'giant') mult = 7; humanYears = 24 + (age - 2) * mult; }const box = document.getElementById('resDog'); box.style.display = 'block'; box.innerHTML = `
Human Age
${humanYears} Years
Your ${size} dog is ${humanYears > 50 ? 'senior' : 'adult'}
`; }const rates = { USD: 1.0, EUR: 0.92, GBP: 0.79, CAD: 1.35, PKR: 278.50 };function runCurrencyCalc() { const amt = parseFloat(document.getElementById('curr_amt').value) || 0; const from = document.getElementById('curr_from').value; const to = document.getElementById('curr_to').value;const inUSD = amt / rates[from]; const converted = inUSD * rates[to];const box = document.getElementById('resCurr'); box.style.display = 'block'; box.innerHTML = `
Result
${converted.toFixed(2)} ${to}
Rate: 1 ${from} = ${(rates[to]/rates[from]).toFixed(4)} ${to}
`; }function runProportionCalc() { const a = parseFloat(document.getElementById('prop_a').value); const b = parseFloat(document.getElementById('prop_b').value); const c = parseFloat(document.getElementById('prop_c').value);const d = (b * c) / a;const box = document.getElementById('resProp'); box.style.display = 'block'; box.innerHTML = `
Solved Value D
${d.toFixed(4)}
Proportion: ${a}:${b} = ${c}:${d.toFixed(4)}
`; }function runGpaCalc() { const input = document.getElementById('gpa_grades').value; const grades = input.split(' ').map(g => parseFloat(g)).filter(g => !isNaN(g) && g >= 0 && g <= 4.0);if (grades.length === 0) { alert('Please enter valid grades between 0-4.0'); return; }const gpa = grades.reduce((a, b) => a + b, 0) / grades.length;const box = document.getElementById('resGpa'); box.style.display = 'block'; box.innerHTML = `
Your GPA
${gpa.toFixed(2)}
${grades.length} grades
`; }let elonSeconds = 0; function startElonTicker() { if (window.elonInterval) clearInterval(window.elonInterval); elonSeconds = 0; window.elonInterval = setInterval(() => { elonSeconds += 0.1; const earned = elonSeconds * 438; document.getElementById('elonLiveValue').textContent = `$${earned.toFixed(2)}`; document.getElementById('elonLiveTime').textContent = `${elonSeconds.toFixed(1)} sec`; }, 100); }// SEARCH document.getElementById('globalSearch').addEventListener('input', (e) => { const query = e.target.value.toLowerCase(); document.querySelectorAll('.card').forEach(card => { const title = card.getAttribute('data-title') || ''; card.style.display = title.includes(query) ? 'flex' : 'none'; }); });// INIT updateDisplay();
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