AlphaCalcs

25 calculators · no sign-up · nothing stored

Get the number, and see how it was reached.

Type what you need to work out. Every calculator runs in your browser and shows the full breakdown underneath the answer, so you can check it instead of trusting it.

Mortgage CalculatorBMI CalculatorPercentage CalculatorLoan CalculatorCompound Interest Calculator

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Popular calculators

Mortgage CalculatorMonthly payment, total interest and the full cost of a home loan.BMI CalculatorBody mass index with the healthy range for your height.Percentage CalculatorPercent of a number, percentage change, and reverse percentages.Loan CalculatorPayment, total interest and payoff schedule for any fixed-rate loan.Compound Interest CalculatorSee how savings and investments grow with regular contributions.Age CalculatorExact age in years, months and days, plus the next birthday.Scientific CalculatorFull expression calculator with trig, logs, powers and roots.Calorie CalculatorDaily calories to maintain, lose or gain weight.

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All categories

Financial

Mortgages, loans, interest and savings. Numbers you can act on.

Health & Fitness

Body composition, energy needs and everyday health metrics.

Math

Arithmetic, percentages, fractions and a full scientific calculator.

Everyday

Dates, ages, tips, grades and other daily-life answers.

Why these calculators give you more than a number

Most online calculators hand back a single figure and leave you to trust it. AlphaCalcs shows the inputs it used, the intermediate steps and the totals behind the headline result, so a monthly mortgage payment arrives with the total interest attached, and a BMI arrives with the category range around it.

Everything runs client-side in JavaScript. Nothing you type is uploaded, logged or saved, which matters when the figures are your salary, your loan balance or your body weight. The pages are static and lightweight, so they load fast on a phone on mobile data.

Built to be checked

Each calculator page explains the formula in plain English, lists the assumptions it makes, and says where the result stops being reliable. A loan calculator assumes a fixed rate and equal payments; a calorie calculator uses the Mifflin-St Jeor equation and cannot know your individual metabolism. Those limits are written on the page rather than buried in a disclaimer.