MakeMyCalc

About MakeMyCalc

MakeMyCalc is a free collection of calculators and converters for the math people actually do — splitting a tip, figuring out a loan payment, converting units while traveling, or checking a percentage.

The project exists because most calculator sites are bloated with ads, trackers, and pop-ups that get in the way of the one thing you came to do: get an answer. We wanted something fast, clean, and private.

Your data stays on your device

Every calculation runs entirely in your browser using JavaScript. Nothing is sent to a server. There is no backend — no database, no user accounts, no analytics on what you calculate. The only exception is the Currency Converter, which fetches published reference rates from a third-party API (frankfurter.dev). Even then, the conversion math itself runs locally.

Tools

MakeMyCalc currently includes 17 tools.

  • Age Calculator — Find your exact age in years, months, days, and hours — plus your next birthday countdown.
  • BMI Calculator — Calculate your Body Mass Index with imperial or metric units and see your WHO category.
  • Date Calculator — Find the difference between two dates or add/subtract days, weeks, months, and years.
  • Percentage Calculator — Calculate percentages five ways — X% of Y, what percent, percentage change, and more.
  • Tip Calculator — Figure out the tip, split the bill, and round up — with preset and custom tip percentages.
  • Currency Converter — Convert between 30 major currencies using live ECB reference rates, cached for fast repeat lookups.
  • Unit Converter — Convert length, weight, volume, temperature, area, speed, and time units instantly.
  • Loan Calculator — Calculate monthly payments, total interest, and see an amortization table for any loan.
  • Compound Interest — See how your money grows over time with compound interest and optional monthly contributions.
  • Hex / Decimal / Binary Converter — Convert numbers between binary, octal, decimal, and hexadecimal — instantly and with strict validation.
  • Ratio Calculator — Simplify a ratio to its lowest terms or solve a proportion A:B = C:D for any missing value.
  • Discount Calculator — Work out the sale price after a percent off, or find the real discount between an original and sale price.
  • Sales Tax Calculator — Add tax to a subtotal to get the total, or back out the pre-tax price from a tax-inclusive total.
  • Fraction Calculator — Add, subtract, multiply, and divide fractions. See the reduced answer plus decimal and mixed-number forms.
  • GPA Calculator — Add your courses with letter grades and credits to compute your weighted GPA on the 4.0 scale.
  • Statistics Calculator — Get mean, median, mode, range, variance, and standard deviation for any list of numbers.
  • Running Pace Calculator — Calculate pace, distance, or finish time for any run — with 5K, 10K, half, and full marathon presets.

Open source

MakeMyCalc is built with Next.js, TypeScript, and Tailwind CSS. Page-view analytics are cookieless and anonymous — no fingerprinting, no user accounts, no behavioral tracking.

A note on accuracy

We do our best to implement correct formulas, but MakeMyCalc is not a substitute for professional advice. Financial calculators give estimates, not quotes. The BMI calculator reflects a general screening metric, not a medical diagnosis. Currency rates are indicative mid-market rates, not what your bank will charge. Always consult a qualified professional for decisions that matter.