JCalc
Smart Online Calculators for Everyday Math and Finance
Free, fast, and easy-to-use calculators for loans, investments, percentages, and more. No signup, no downloads—just results.
Popular Calculators
Loan Calculator
Calculate monthly payments, total interest, and amortization for any fixed-rate loan.
ROI Calculator
Measure return on investment. Enter initial and final value for instant ROI percentage.
Percentage Calculator
X% of Y, Y is what % of X, and percentage change. Handles discounts, tips, and more.
Financial Calculators
Loan Calculator
Estimate monthly payments for mortgages, auto loans, and personal loans.
ROI Calculator
Calculate return on investment for stocks, real estate, and business ventures.
Percentage Calculator
Solve percentage problems: X% of Y, what percent, and percentage change.
Business Calculators
Profit & Pricing
Calculate profit, margin, markup, and optimal pricing.
Break-even
Find how many units to sell to cover costs.
Cash Flow
Net cash flow from inflows and outflows.
Growth
CAGR and growth rate for any metric.
Unit Economics
CAC, LTV, and LTV:CAC ratio.
About Online Calculators
Online calculators provide instant, accurate results for everyday math and finance tasks. Whether you're planning a loan, evaluating an investment, or working with percentages, JCalc delivers reliable answers without signup or installation. Our tools run entirely in your browser—your data never leaves your device.
JCalc is designed for clarity and speed. Each calculator includes formula explanations, example calculations, and FAQs to help you understand the results. We offer a growing suite of calculators for finance, math, and everyday life. Bookmark this page for quick access to all tools.
All Tools
- Loan Calculator — Monthly payments
- ROI Calculator — Investment returns
- Percentage Calculator — X% of Y, percent change
- Profit & Pricing — Margin and markup
- Break-even — Break-even analysis
- Cash Flow — Net cash flow
- Growth — CAGR and growth rate
- Unit Economics — CAC and LTV