# Trophic Level Energy Transfer Efficiency (from Measured Levels) Per-step and mean trophic transfer efficiencies from measured level values, with band grading, weakest transfer, and next-level projection. > Canonical page: https://elysiatools.com/en/tools/trophic-level-efficiency - **Category:** Health - **Keywords:** trophic efficiency, energy transfer, lindeman efficiency, ecological efficiency, food chain efficiency, 10 percent law, energy pyramid, trophic levels, ecosystem ecology, energy flow, production efficiency, ecology calculator ## Overview Enter measured energy or biomass for 2–6 trophic levels (producers first) to recover each transfer efficiency, the Lindeman-style mean, 5–20% band grades, the weakest step, the share of producer energy left at the top, and a projection for a hypothetical next level. ## Inputs - **Measured energy/biomass at each trophic level (T1 first, one per line)** (textarea): One positive value per trophic level, T1 (producers) first, separated by new lines, commas, or spaces. 2–6 levels. ## When to use - You have field or literature values for energy or biomass at successive trophic levels and need the implied transfer efficiencies. - You want to grade each step as low (<5%), typical (5–20%), or high (>20%) and flag the weakest link in the chain. - You need the compounded retention at the top predator plus a mean-efficiency projection for one more level. ## How it works - Paste one positive number per level, T1 producers first, using new lines, commas, or spaces (2–6 values). - Each transfer is computed as next/previous × 100%, graded by band, and the lowest-efficiency step is identified. - The tool reports mean efficiency, overall percentage of producer energy remaining at the top level, and the projected value of a hypothetical next level at that mean. - Energy pyramids cannot invert: a later level larger than the previous one is rejected so you can check data order. ## Use cases - Recover per-step and mean efficiencies from published grassland or estuary energy-pyramid numbers. - Locate the limiting transfer in a four-level food chain for teaching or reporting. - Test whether a fifth trophic level would still be viable at the observed mean efficiency. ## Frequently asked questions ### How many trophic levels can I enter? Two to six positive values, with T1 (producers) listed first. ### What units should the numbers use? Any consistent energy or biomass units; results are unitless percentages. ### What do the efficiency bands mean? Below 5% is low, 5–20% is typical (the classic 10% range), and above 20% is high. ### Why is an inverted pyramid rejected? Energy pyramids cannot invert; a later level larger than the previous one indicates reversed order or mixed units. ### What is the projected next level? The hypothetical value obtained by applying the mean transfer efficiency to the current top level. ## Related tools - [Pulse Pressure Calculator (PP = SBP − DBP)](https://elysiatools.com/en/tools/pulse-pressure-calculator): Calculate PP = SBP − DBP and MAP = DBP + PP/3. Normal ~30–40 mmHg; wide PP → high SV or stiff arteries; narrow PP → low SV. Pulsus paradoxus flags tamponade/asthma/PE. Derived from McDonald's, Franklin 1999, Blacher 1999, StatPearls, LITFL. 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