terican

1,360 tools, indexed · Updated daily

A complete
reference
for everyday
calculation,
from kilograms
to mortgages.

1,360 calculators and converters, arranged on a single page so you never click twice. Quiet typography, exact arithmetic, every formula shown in plain language.

1,192

calculators

168

converters

8

categories

In rotation today — Mortgage payment, BMI, Celsius ↔ Fahrenheit, Tip & split, Date difference, Compound interest, kg ↔ lb.

Editor's picks · Spring 2026

№ 01 · ToolStandard Equation Of A Circle CalculatorCalculate the standard circle equation (x−h)²+(y−k)²=r² by entering a center and radius, or a center and a known point on the circle.Open the tool№ 02 · ToolDays Old CalculatorCalculate exactly how many days old you are by entering your birth date and a target date. Uses the Julian Day Number formula for precision.Open the tool№ 03 · ToolCovid 19 Mortality Risk CalculatorEstimate COVID-19 mortality risk using age, sex, vaccination status, and up to 8 comorbidities. Powered by peer-reviewed epidemiological odds ratios.Open the tool№ 04 · ToolWedding Countdown CalculatorFree wedding countdown calculator. Enter your wedding date to instantly see the exact number of days remaining. Handles leap years and all calendar dates.Open the tool

The complete index

Sort: Subject · View: Columns · 8 categories

construction108
№ 01 · 108 tools
finance179
№ 02 · 179 tools
legal01
№ 03 · 1 tool
business55
№ 04 · 55 tools
math465
№ 05 · 465 tools
general210
№ 06 · 210 tools
physics53
№ 07 · 53 tools
health289
№ 08 · 289 tools

From the editors

What we mean
by “exact”.

Every conversion on terican uses constants ratified by the Bureau International des Poids et Mesures, computed in arbitrary precision and rounded only at the moment of display.

Every calculator is audited against its own formula and published with that formula in plain language — because a calculator that hides its arithmetic is just a magic trick.