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Cellular Respiration ATP Yield Calculator

Biology

Calculate total ATP yield from cellular respiration per mole of glucose. Uses the modern ~30 ATP net textbook figure with glycolysis, Krebs, and ETC breakdown.

0.11,000

Total ATP Produced

30
Net ATP — Glycolysis
2
ATP — Krebs Cycle (GTP/ATP)
2
ATP — Electron Transport Chain
26

This calculator computes your Total ATP Produced, Net ATP — Glycolysis, ATP — Krebs Cycle (GTP/ATP), ATP — Electron Transport Chain from the values you enter.

Inputs
Moles of GlucoseATP Yield per Glucose (Model)
Outputs
Total ATP ProducedNet ATP — GlycolysisATP — Krebs Cycle (GTP/ATP)ATP — Electron Transport Chain

What is a ATP Yield?

The ATP Yield Calculator estimates the total ATP produced from a given amount of glucose through complete aerobic cellular respiration. Enter moles of glucose and choose a textbook ATP-per-glucose model (~30, ~32, or ~36 ATP), and the calculator returns total ATP yield along with a breakdown across glycolysis, the Krebs cycle, and the electron transport chain.

This calculator uses the modern ~30 ATP net per glucose figure as the default, reflecting current biochemistry consensus about mitochondrial shuttle costs. To identify which fuel source is being metabolized before estimating its ATP yield, see the Respiratory Quotient Calculator.

How to use this ATP Yield calculator

  1. Enter moles of glucose — the quantity of glucose being fully oxidized through aerobic respiration.

  2. Choose an ATP yield model — ~30 ATP (modern textbook consensus), ~32 ATP (classic textbook figure), or ~36 ATP (older theoretical maximum).

  3. Read the total ATP yield — the highlighted result, scaled to your glucose quantity.

  4. Review the stage breakdown — glycolysis, Krebs cycle, and electron transport chain contributions shown separately.

Formula & Methodology

Total ATP formula:
Total ATP = Moles of Glucose × ATP Yield per Glucose (chosen model)

Stage breakdown (net ATP per glucose, by model):
- Glycolysis: 2 net ATP (all models — substrate-level phosphorylation, after subtracting the 2 ATP invested)
- Krebs cycle: 2 ATP (as GTP, all models — substrate-level phosphorylation)
- Electron transport chain: the remainder — 26 (for the ~30 model), 28 (for ~32), or 32 (for ~36)

Worked example (1 mole of glucose, ~30 ATP model):

Glycolysis = 2 ATP

Krebs cycle = 2 ATP

Electron transport chain = 26 ATP

Total = 2 + 2 + 26 = 30 ATP

Important assumption: This calculator uses idealized textbook ATP-per-glucose figures for teaching purposes. Actual cellular ATP yield varies by tissue type, mitochondrial efficiency, and which NADH shuttle mechanism is used — real yields are rarely a perfectly round number.

Frequently Asked Questions

Modern textbooks typically estimate ~30 ATP net per glucose molecule through complete aerobic respiration (glycolysis, the Krebs cycle, and oxidative phosphorylation), though older textbooks cite ~32 or a theoretical maximum of 36, depending on assumptions about mitochondrial shuttle efficiency.
The difference comes from assumptions about how NADH generated in the cytoplasm during glycolysis is shuttled into the mitochondria. The malate-aspartate shuttle (used in liver, heart, and kidney cells) yields more ATP per NADH, while the glycerol-3-phosphate shuttle (used in skeletal muscle and brain) yields less — modern estimates account for this shuttle cost, producing the lower ~30 ATP figure.
The electron transport chain (oxidative phosphorylation) produces the vast majority of ATP — roughly 26-32 of the total, depending on the model — while glycolysis and the Krebs cycle together contribute only 4 ATP directly through substrate-level phosphorylation.
Glycolysis produces 4 ATP through substrate-level phosphorylation (gross), but 2 ATP are consumed early in the pathway to prime the reactions, leaving a net gain of 2 ATP per glucose molecule — the figure used in this calculator's glycolysis breakdown.
The ~30 ATP model reflects current biochemistry consensus and accounts for the real energetic cost of shuttling cytoplasmic NADH into mitochondria and for ATP used in transporting the produced ATP out of the mitochondria. The older 36-38 ATP figures were theoretical maximums that didn't account for these transport costs.
No — this calculator models complete aerobic cellular respiration only. Anaerobic fermentation (lactic acid or alcoholic) yields only the 2 net ATP from glycolysis, since no oxygen is available for the Krebs cycle or electron transport chain to proceed.
The respiratory quotient (RQ) tells you which fuel (fat, protein, or carbohydrate) is being metabolized, while ATP yield tells you how much energy that fuel produces once identified. Use the [Respiratory Quotient Calculator](/respiratory-quotient-calculator/) first to confirm glucose/carbohydrate is the primary substrate before applying this glucose-based ATP yield estimate.
The Krebs cycle generates 2 GTP (readily converted to ATP) through substrate-level phosphorylation per glucose molecule (1 per turn of the cycle, and the cycle turns twice per glucose since glycolysis splits glucose into two pyruvate molecules), but its far larger energy contribution comes indirectly, via the NADH and FADH2 it produces for the electron transport chain.
Yes — it's also a quick reference for anyone studying metabolism, nutrition science, or biochemistry who needs to estimate total cellular energy yield from a given quantity of glucose, such as when comparing metabolic efficiency across different biological systems.
Two ATP molecules are consumed in the early, energy-investment phase of glycolysis to phosphorylate glucose and fructose-6-phosphate, priming the six-carbon sugar for splitting. These are recovered plus more during the payoff phase, giving the net +2 ATP figure used in this calculator.
If you know the mass of glucose (in grams) rather than moles, convert using glucose's molar mass (approximately 180 g/mol) to get moles first, then enter that value — the calculator scales ATP yield linearly with moles of glucose input.
Also known as
cellular respiration calculatorATP per glucose calculatorglucose to ATP calculatoraerobic respiration ATP yield