About CalculatorsAndMore

What this site is

CalculatorsAndMore.com is a collection of 224 free calculators across seven categories: finance, health and fitness, math, date and time, construction, unit conversion, and a grab-bag of everyday tools (GPA, grades, tip, random numbers, and more). Every calculator runs entirely in your browser. You do not need to sign up, install anything, or hand over an email address to use any of it.

We started the site because most calculator sites are slow, cluttered, and hard to trust. Results come back instantly, the math is documented on every page, and each calculator is pinned to a specific formula or regulatory source so you can verify what it did and why.

Who runs it

The site is maintained by Haris, an independent developer with a background in web engineering and financial modeling. Calculator logic is written by hand in TypeScript, reviewed against published formulas, and cross-checked against at least one established reference (IRS publications, NIST, CDC, peer-reviewed sources, or comparable authoritative tools) before a page ships.

When a calculator depends on tax rates, benefit formulas, or other numbers that change year over year, we list the reference year directly on the page so you know how current the math is. See our methodology page for how we build and verify each calculator.

What makes these calculators different

• The formula is on the page. Every calculator shows the exact formula it uses and at least one worked example with real numbers, not placeholders. If you disagree with a result, you can audit it in seconds.
• Your inputs never leave your browser. All math runs client-side. Nothing you enter is uploaded, logged, or stored on our servers. Close the tab and the inputs are gone.
• No paywall, no account, no dark patterns. Every calculator is free, every feature works on the first visit, and we do not gate any output behind an email capture.
• Built for speed. Pages are statically generated, aggressively cached, and load in under a second on a cold connection. We measure Core Web Vitals on every release.
• Mobile-first design. Every input, chart, and table is built to be usable on a phone in portrait mode, not retrofitted from a desktop layout.

What you will find here

• Financial (67 calculators): Mortgages, loans, interest, retirement, and more
• Health & Fitness (39 calculators): BMI, calories, body fat, pregnancy, and more
• Math (47 calculators): Percentages, fractions, statistics, and more
• Date & Time (16 calculators): Age, date differences, business days, and more
• Construction (16 calculators): Concrete, flooring, paint, roofing, and more
• Unit Conversion (18 calculators): Length, weight, temperature, volume, and more
• Other (21 calculators): GPA, grades, subnet, random numbers, and more

Our limits, stated plainly

The calculators on this site are built for general informational use. They are not a substitute for a licensed financial advisor, tax professional, doctor, engineer, or lawyer. Tax brackets change, benefit formulas change, health guidance changes, and your specific situation will have details a general calculator cannot account for.

When results matter (you are about to sign a mortgage, file a return, or make a medical decision) always verify with a qualified professional. Read our terms of use for the full disclaimer.

Contact and feedback

Spotted a bug, disagree with a result, or want to see a calculator we do not have? Write to hello@calculatorsandmore.com or use our contact page. We read every message.