Free online tools that actually load fast.
Calculators, converters, text and developer utilities. No sign-up. Everything runs in your browser — your data never leaves the page.
Text Tools
- Word Counter
Free online word counter. Instantly count words, characters (with and without spaces), sentences, paragraphs and estimated reading time.
- Case Converter
Convert text to UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and more — all at once, in your browser.
Generators
Developer Tools
Calculators
- Age Calculator
Free age calculator. From a date of birth, see exact years/months/days, total months, weeks, days, hours, and the countdown to your next birthday.
- Tip Calculator
Calculate tip on a restaurant bill and split the total fairly across the table. Quick percentages (10/15/18/20/25) plus custom rates and party size.
- Discount Calculator
Three-in-one discount calculator: find the sale price after a % off, the discount % between two prices, or the original price before a known discount.
- Percentage Calculator
Calculate X% of Y, find what % X is of Y, or compute the % change between two numbers. The three percentage questions that come up most often.
- BMI Calculator
Calculate your Body Mass Index in metric (cm/kg) or imperial (ft/in/lb) units. See your BMI category and the healthy weight range for your height.
Rwanda Tools
- Rwanda PAYE Calculator
Calculate Rwanda PAYE (Pay As You Earn) monthly income tax. See the tax owed in each RRA bracket for your gross salary — updated to current RRA brackets.
- Rwanda Net Salary Calculator
Convert gross salary to net take-home in Rwanda. Includes PAYE, RSSB pension, maternity contribution and optional CBHI, plus total employer cost.
- MTN MoMo Fee Calculator
Calculate MTN MoMo fees in Rwanda. Covers sending, withdrawing at agent, bank push/pull, international remittance, tax and school fee payments — from MTN's official tariff.
Converters
- Currency Converter
Convert between 20 world currencies — USD, EUR, GBP, RWF, KES, NGN and more — with live mid-market rates updated hourly.
- Unit Converter
Convert between metric and imperial units — length, weight, temperature, volume, area and speed. 230+ pair pages with formulas and reference tables.
Finance
- Compound Interest Calculator
Calculate compound interest with monthly contributions and a year-by-year breakdown. See total interest earned and projected balance over any horizon.
- Loan Calculator
Calculate the monthly payment (EMI), total amount paid and total interest on any fixed-rate loan — personal, car, student, or general purpose.
- Inflation Calculator
Project the future cost of an item and the lost buying power of money over time at any inflation rate. Common rate presets included.
- Mortgage Calculator
Estimate the full monthly mortgage payment (principal, interest, tax, insurance, HOA), with a year-by-year or month-by-month amortization schedule and balance chart.
- Retirement Calculator
Project your retirement savings and the income they'll sustainably produce. Includes the 4% safe withdrawal rule and a chart of contributions vs. investment growth.
- ROI Calculator
Calculate total ROI and annualised return (CAGR) for any investment given its initial value, final value and holding period. Handles gains and losses.
- Savings Goal Calculator
Two modes: how much to save monthly to reach a goal in N years, or how long it'll take given a fixed monthly contribution. Accounts for compound growth.
- FIRE Calculator
Calculate your FIRE number (25× expenses), years to reach it, and whether you've already hit Coast FIRE — enough invested today to coast to retirement without further saving.
- Debt Payoff Calculator
Compare Snowball (smallest balance first) and Avalanche (highest APR first) payoff strategies across all your debts. See months to debt-free and total interest saved.
- Credit Card Payoff Calculator
Two modes: how long to clear a balance at $X/month, or what monthly payment is needed to clear it in N months. Includes total interest paid.
- Rent vs Buy Calculator
Compare the true long-term cost of renting vs buying a home, including down payment, mortgage, tax, maintenance, appreciation, and the renter's investment opportunity cost.
- Budget Calculator
Split your monthly income into a 50/30/20, 70/20/10 or 60/30/10 budget — or build a custom zero-based budget with your own categories. Live pie chart.
- Sales Tax / VAT Calculator
Add VAT or sales tax to a net amount, or split a tax-inclusive amount back into net and tax. Custom rate plus presets for common rates worldwide.