---
title: "Free Calculator Directory: Finance, Health, Math & More"
description: "Browse 179 free calculators for mortgages, salary, tax, BMI, percentages, statistics and unit conversion. Search by task or explore each topic."
url: "https://worldcalculators.org/calculators/"
canonical: "https://worldcalculators.org/calculators/"
---

# All calculators

Browse 179 free calculators for mortgages, salary, tax, BMI, percentages, statistics and unit conversion. Search by task or explore each topic.

## 🏥 Health & Body

WHO, Asia-Pacific, Japan & Korean standards
BMR & TDEE using Mifflin-St Jeor, Schofield (NHS), Harris-Benedict

## 💪 Health & Fitness

Mifflin-St Jeor (US), Harris-Benedict, Katch-McArdle, NHS Schofield
Total daily energy expenditure with 6 activity levels — WHO, CDC, NHS

## 💰 Finance & Loans

Monthly payments, housing costs, extra principal and full amortization
US loans vs UK HP/PCP agreements vs Canada & Australia financing

## 📈 Investment & Returns

Total and annualized return on investment — US CGT vs UK ISA vs AU 50% discount
PV of lump sum or annuity — US OMB 7% vs UK Green Book 3.5%

## 🏦 Retirement & Tax

2026 contribution limits + employer match projection
Traditional vs Roth IRA side-by-side — UK ISA, CA TFSA, AU super equivalents

## 📊 Business & Profitability

Gross margin % from cost and revenue — margin vs markup explained
Selling price from cost and markup % — retail standards by industry

## 🏠 Real Estate

US 28/36 rule, UK 4.5× income, Canada stress test, Australia buffer
Compare total cost of renting vs buying — break-even point, equity

## 🏦 Savings & Retirement

US HYSA, UK Cash ISA, Canadian TFSA, Australian high-interest savings
4% rule nest-egg goal — UK pension, RRSP, Australian super

## 💳 Debt & Credit

Fixed vs minimum-only payments. US ~22.99%, UK ~20–25% APR explained.
Avalanche vs snowball method — compare strategies, see total interest

## 💵 Salary & Income

Annual ↔ monthly ↔ hourly ↔ weekly conversion. Minimum wages by country.
Convert hourly wage to annual salary accounting for paid/unpaid time off

## 🔢 Math & Numbers

sin, cos, tan, log, ln, √, x², factorials — deg & rad modes
Plot up to 6 functions simultaneously — polynomials, trig, exponentials, logarithms. Pan & zoom.

## 🧮 Linear Algebra

Add, subtract, magnitude, unit vector — 2D, 3D & 4D vectors with steps
Scalar product A·B and angle between vectors — 2D to 5D

## 📐 Math & Science — Fundamentals

Circle, rectangle, triangle, trapezoid, ellipse, parallelogram — m² & ft²
Sphere, cylinder, cone, cube, prism — litres, US gallons, UK gallons

## 📊 Statistics & Probability

Mean, median, mode, std dev (sample & population), variance, IQR
All 3 averages + range from any data set. Why governments use median income.

## 🔄 Conversion

Celsius, Fahrenheit, Kelvin, Rankine with reference table
Length, weight, volume, area — metric & imperial

## ⏱️ Time & Utility

Convert time between any two IANA time zones — DST handled automatically
Live current time in any two cities — time difference updated every second

## 🎓 Education & Science

Weighted grades — US letter, UK Honours, German, French scales
Punnett squares — monohybrid, dihybrid, ABO blood types, X-linked traits

## 🏠 Home & Tools

Total area of multiple rooms in ft², m², yd² & acres + material cost — how floor area is measured worldwide
Cubic yards (US), cubic metres (UK/AU), bag counts for 60/80lb and 20/25kg bags

## 💖 Fun & Lifestyle

Name compatibility % + the classic FLAMES game, plus how love traditions differ worldwide

## How should I pick a calculator?

Start from the job, not the formula. Each of these is a hub: the tool plus country notes, tables, and related pages.
Six countries, monthly net, tax freedom day.

## Why WorldCalculators.org?

Most calculator sites give you a number. We give you the number — and explain how Japan, the UK, Germany, and the US all calculate it differently. Because the same formula doesn't always mean the same answer.

Source: https://worldcalculators.org/calculators/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.