Vicaya GlobalCalculator

Free US paycheck, mortgage and loan calculators

Vicaya is a free calculator site with 523 tools and one rule: every result shows the formula and the assumptions behind it.

Browse by subject

Finance Take-home pay, mortgages, refinancing, loans, debt payoff and retirement, across two markets. 136 calculators Health Browser-only screening measures with visible formulas, limitations, medical sources and review dates. 22 calculators Solar Panel output, inverter sizing, shading, payback and battery sizing, worked from real physics. 15 calculators Everyday Tips and bill splitting, dates and ages, grades and time — the arithmetic that shows its working. 9 calculators Pets Dog and cat age, feeding amounts, ideal weight, puppy growth, pregnancy dates and the cost of a pet — each with the formula and its veterinary source shown. 17 calculators Convert Instant unit conversions for length, weight, temperature, volume, area and speed, with exact formulas, tables and common values. 219 calculators Time Live holiday countdowns, how many days until any date, and shareable countdowns to your own events, all worked out in your time zone. 50 calculators Math A high-precision scientific calculator with exact answers, plus percentage and fraction calculators that show their working. 18 calculators Tools Small, fast tools for charts, exact number conversion, amount wording and typing practice. 28 calculators Developer Tools Browser-based utilities for JSON, Base64, placeholder text, case conversion, ASCII references and QR codes, with local processing and clear errors. 9 calculators

Every calculator, A–Z

The core is US personal finance — paycheck and take-home pay with federal and state withholding, mortgage payments, amortization, refinancing and loans — alongside India and UK tax tools, health and fitness calculators, and a solar section built on its own physics model. Nothing you type leaves your browser, and there is no signup.

What to expect from these tools

Educational estimateEvery result is an estimate from the numbers you enter. The formula, the assumptions, and what is left out are printed on the page.
Inputs stay in this browserCalculations run on your device. No signup required, and no figure you type is sent to a Vicaya server.
Compare scenarios firstThe tools line up tradeoffs side by side rather than pretending one answer fits everyone.

Free online calculators with the working shown

Most calculator sites hand you a number and stop. Here every result sits next to the formula that produced it, the assumptions behind it and the figures it leaves out, so you can check the answer instead of trusting it. The finance calculators are the largest group, led by the paycheck calculator, which turns gross pay into take-home pay after federal and state withholding. Next to it sit mortgage payment, amortization, refinance and loan tools, with India and UK tax calculators for readers in those markets.

Beyond money, there are health and fitness calculators that state their limits and medical sources, a solar section for panel output, payback and battery sizing, and unit converters for length, weight, temperature and volume. Date and time tools, math calculators and developer utilities cover the everyday arithmetic in between.

Everything runs in your browser, so the figures you type are never sent to a server, and nothing requires an account. Read how results are produced on the methodology page, or see the sources and assumptions behind the rates and thresholds.