Kardashev Explorer

0years from now

2,688 ADK 0.727532× to Type I

Compound at 0.95%/yr · P → 1.00e+16 W (K = 1)

Baseline: Last 20 years · 0.95%/yr · computed from historical total power series (2006–2026).

Interactive instrument

Energy tracker

Continuous historical Kardashev curve built from best-estimate total civilization power: population × energy capture before industrialization, reconstructed primary energy after 1800, and statistical global energy data in the modern era.

2,026

Deep historyIndustrial → nowProjected

Method

How it works

Civilization power is estimated first. Kardashev follows from that power — never the other way around.

Carl Sagan speaking at Cornell University, circa 1987 — Carl Sagan · Cornell, c. 1987
Kenneth C. Zirkel · CC BY-SA 3.0

Carl Sagan’s continuous Kardashev scale

In 1964, Nikolai Kardashev proposed ranking civilizations by the energy they can command — Type I (planetary), Type II (stellar), Type III (galactic). The original ladder was discrete.

In Cosmic Connection (1973), Carl Sagan turned it into a continuous score so a civilization could sit between rungs — including Earth, still Type 0 and climbing. His interpolation maps average power P (watts) onto a Kardashev number K.

Sagan equation

K = \dfrac{\log_{10}(P) - 6}{10}

P = average power in watts
Type I · 1.00e+16 W · K = 1
Type II · 1.00e+26 W · K = 2
Type III · 1.00e+36 W · K = 3

Timeline

A loose reverse chronology through civilization energy eras — newest first — with the milestones that bend each stretch of the curve.