What does ‘beyond reasonable doubt’ mean?
Beyond reasonable doubt is the highest standard of proof in Australian law. To convict someone of a crime, the prosecution must prove their guilt so that there is no reasonable doubt left — close to certainty, but not a fixed percentage and not proof beyond every possible or imaginary doubt.
In any criminal case, the prosecution has to prove that the accused person is guilty. The question is: how sure does the court have to be? The answer is "beyond reasonable doubt" — the most demanding standard the law uses, and a deliberately high bar because a criminal conviction can cost someone their liberty, their job and their reputation.
It is easiest to understand by what it requires and what it does not. It requires the court (a jury, or a magistrate sitting alone) to be sure of guilt to the point where any doubt that remains is not a reasonable one. It does NOT require proof beyond all doubt, or absolute scientific certainty — the law accepts that it is almost impossible to prove anything about a past event with total certainty. A doubt that is merely fanciful, imaginary or far-fetched is not a "reasonable" doubt and does not stand in the way of a conviction. But a genuine, sensible doubt — the kind a reasonable person would act on — means the prosecution has not met the standard, and the accused must be found not guilty.
Underlying all of this is the presumption of innocence: every person charged with a crime is presumed innocent until the prosecution proves otherwise to this standard. The accused does not have to prove that they are innocent. If you take only one thing from this page, take that.
A simple example
A short example shows how it works.
Worked example
Imagine a person is charged with stealing a wallet. A witness says they saw "someone in a red jacket" take it, and the accused owns a red jacket. That might make the accused a suspect, even probably guilty. But "probably" is not enough. If there is a reasonable possibility that someone else in a red jacket took the wallet — and nothing else ties the accused to it — then a reasonable doubt remains, and the law requires a verdict of not guilty.
This is the part people find hardest to accept: a court can think it is likely the accused did it and must still acquit, because "likely" falls short of "beyond reasonable doubt". The standard is designed to make it very hard to convict an innocent person, even at the cost of sometimes acquitting a guilty one. As the courts put it, it is better that the standard be high than that innocent people be convicted on suspicion.
What it IS — and what it is NOT
Because the phrase is so often misunderstood, it helps to set out clearly what beyond reasonable doubt does and does not mean. Australian courts have repeatedly made these points.
Beyond reasonable doubt IS
- The highest standard of proof in the law — much higher than the civil standard.
- Proof that leaves no reasonable doubt about the accused person’s guilt.
- A level close to certainty — the court must be sure, not just think it likely.
- A standard the prosecution must meet for the case to succeed.
Beyond reasonable doubt is NOT
- A percentage. It is not 99%, 95% or any number — courts refuse to put a figure on it.
- Proof beyond ALL doubt, or absolute or scientific certainty.
- Defeated by a fanciful, imaginary or far-fetched doubt.
- Something the accused has to disprove — they never have to prove their innocence.
How beyond reasonable doubt works in a real case
When a court applies the standard, a few key rules follow. These are the points that decide cases:
The prosecution carries the burden
It is for the prosecution to prove guilt beyond reasonable doubt. The accused does not have to prove anything, and is entitled to stay silent and put the prosecution to proof.
Every element must be proved
The prosecution must prove each legal element of the offence beyond reasonable doubt. It does not have to prove every single fact to that standard — but any fact that is an indispensable link in the chain of reasoning to guilt must be (Shepherd v The Queen).
Circumstantial cases must point only to guilt
Where the case is built on circumstantial evidence, guilt must be the only rational inference, and the circumstances must exclude any reasonable explanation consistent with innocence (Barca v The Queen; The Queen v Baden-Clay).
A reasonable doubt means acquittal
If, looking at the whole of the evidence, a reasonable doubt remains about guilt, the accused must be found not guilty. The doubt is resolved in the accused’s favour.
Same standard, jury or magistrate
The standard is identical whether a jury decides the case (in higher courts) or a magistrate decides it alone (in the Local or Magistrates Court). Both must be satisfied beyond reasonable doubt to convict.
‘Not guilty’ is not the same as ‘innocent’
A not-guilty verdict means the prosecution did not prove the case to the required standard. It is a finding that guilt was not established — not a positive finding that the person is innocent.
Who has to prove it? The burden of proof
The single most important rule is that the prosecution bears the burden of proof. The accused is presumed innocent and, in the ordinary case, does not have to prove anything at all — not their innocence, and not (in most situations) their defence. If the prosecution cannot remove every reasonable doubt, the accused walks free. This is sometimes called the "golden thread" of the criminal law, after a famous 1935 case (see below).
There are a few limited exceptions, and it is important to be accurate about them. First, where an accused person raises the defence of insanity or mental impairment, they carry the burden of proving it — but only to the lower civil standard, the balance of probabilities, not beyond reasonable doubt. Second, some statutes place a specific burden on an accused (a "reverse onus"), again usually only on the balance of probabilities.
Most defences work differently and do NOT shift the real burden. For a defence like self-defence, the accused only needs to point to enough evidence to raise it as a genuine issue (this is called the evidential burden). Once it is raised, the prosecution must disprove it beyond reasonable doubt. So even where the accused "runs a defence", it is still almost always the prosecution that has to satisfy the court, to the criminal standard, that the accused is guilty.
Beyond reasonable doubt vs the balance of probabilities
Australia has two main standards of proof, and the difference matters. Criminal cases use "beyond reasonable doubt". Civil cases — disputes about money, contracts, negligence, family law and the like — use a much lower standard called the "balance of probabilities", which simply means more likely than not (more than 50%). That is why the same conduct can lead to a not-guilty verdict in a criminal court but still be found proven in a civil court: the bar is far lower in the civil case.
There is one refinement worth knowing. In civil cases, the more serious the allegation, the stronger and more cogent the evidence a court will want before it is reasonably satisfied — a principle from the case of Briginshaw v Briginshaw. Importantly, this is NOT a third, in-between standard. Serious civil allegations are still decided on the balance of probabilities; the court just applies that standard with extra care. Only criminal cases use beyond reasonable doubt.
Why won’t the judge define ‘reasonable doubt’?
People are often surprised to learn that, in most of Australia, a trial judge will not tell the jury what "beyond reasonable doubt" means. This is deliberate. The High Court has held that the words are ordinary English that jurors understand, and that trying to explain or paraphrase them tends to confuse rather than help. In Green v The Queen the Court said the expression should be left to the jury without elaboration, and that a reasonable doubt is simply a doubt the jury, as reasonable people, considers to be reasonable. In La Fontaine v The Queen the Chief Justice said it is "both unnecessary and unwise" for a judge to attempt explanatory glosses on the phrase. The Court repeated the point as recently as The Queen v Dookheea (2017).
Victoria is the notable exception. Under the Jury Directions Act 2015 (Vic), if a Victorian jury asks the judge what "beyond reasonable doubt" means, the judge is now allowed to explain it — for example, by telling the jury that it is not enough that the accused is probably or very likely guilty, that they cannot be satisfied of guilt if they have a reasonable doubt, and that a reasonable doubt is not an imaginary or fanciful one. Even there, the judge does not put a number on it.
Finally, the standard has teeth on appeal. If a jury convicts but, looking at the whole of the evidence, it was not actually open to be satisfied of guilt beyond reasonable doubt, an appeal court can quash the conviction. The High Court did exactly this in the well-known case of Pell v The Queen in 2020, holding that on all the evidence there remained a reasonable doubt, so the convictions could not stand.
Where it comes from: the ‘golden thread’
The modern rule traces back to a 1935 decision of the House of Lords, Woolmington v DPP, which is treated as foundational across Australia. A man convicted of murdering his wife argued the jury had been wrongly told he had to prove his actions were accidental. The court agreed the burden had been put the wrong way around, and Viscount Sankey gave the criminal law one of its most quoted passages — the "golden thread" that runs through the whole of the criminal law: the prosecution must prove guilt, and if a reasonable doubt remains, the accused must be acquitted.
Throughout the web of the English Criminal Law one golden thread is always to be seen, that it is the duty of the prosecution to prove the prisoner's guilt … If, at the end of and on the whole of the case, there is a reasonable doubt, created by the evidence given by either the prosecution or the prisoner, the prosecution has not made out the case and the prisoner is entitled to an acquittal.
Viscount Sankey LC, Woolmington v DPP [1935] AC 462 at 481
Key cases on the standard of proof
Woolmington v DPP
[1935] AC 462 (House of Lords)
The ‘golden thread’ case. The prosecution must prove guilt; the accused does not have to prove innocence; and if a reasonable doubt remains, the accused must be acquitted. Foundational in Australia.
Green v The Queen
(1971) 126 CLR 28 (High Court)
‘Beyond reasonable doubt’ should be left to the jury without elaboration. A reasonable doubt is a doubt the jury, as reasonable people, considers reasonable.
La Fontaine v The Queen
(1976) 136 CLR 62 (High Court)
It is ‘both unnecessary and unwise’ for a trial judge to attempt explanatory glosses on the phrase — the classic, popularly understood formula speaks for itself.
Shepherd v The Queen
(1990) 170 CLR 573 (High Court)
The prosecution must prove each element of the offence beyond reasonable doubt, but not every individual fact — only a fact that is an indispensable link in the chain of reasoning to guilt.
The Queen v Baden-Clay
(2016) 258 CLR 308 (High Court)
Modern restatement of the circumstantial-evidence rule: to convict, guilt must be the only rational inference, excluding any reasonable hypothesis consistent with innocence.
The Queen v Dookheea
(2017) 262 CLR 402 (High Court)
Recent confirmation that judges should generally not try to explain ‘beyond reasonable doubt’, and should avoid contrasting it with ‘beyond any doubt’.
Pell v The Queen
[2020] HCA 12 (High Court)
A modern example of an appeal court quashing a conviction: on the whole of the evidence there remained a reasonable doubt, so it was not open to the jury to be satisfied of guilt.
Where the standard is written down
The common law and the Evidence Acts
- The standard is principally a rule of the common law — Woolmington v DPP and the High Court cases above.
- It is codified in section 141 of the uniform Evidence Acts: the court must not find the prosecution case proved unless satisfied beyond reasonable doubt.
- The uniform Evidence Acts apply in the Commonwealth, NSW, Victoria, the ACT, Tasmania and the NT.
- Queensland, South Australia and Western Australia are not uniform Evidence Act states, but the same common-law standard applies there.
- Section 141 also fixes the defendant’s standard (where they must prove something) at the balance of probabilities.
- In Victoria, the Jury Directions Act 2015 (ss 63–64) lets a judge explain the phrase if the jury asks.
- The presumption of innocence is also recognised in international law (Article 14 of the ICCPR).
If you are facing a criminal charge
1
Remember the prosecution has to prove the case against you — you do not have to prove your innocence. Do not assume that ‘probably guilty’ is enough to convict; it is not.
2
Be careful about what you say. You generally have a right to silence, and the prosecution must prove its case without your help. Get advice before you give any statement or answer questions.
3
Get legal advice early about whether the prosecution can actually prove every element of the offence beyond reasonable doubt — that is often where a case is won or lost. Call 1800 951 176 for free information.
4
If the case against you is circumstantial, ask a lawyer whether the evidence really excludes every reasonable innocent explanation, because that is the test the court must apply.
5
Call Legal Hotline on 1800 951 176 and we can connect you with a vetted criminal lawyer who can assess the strength of the case and your options.
Common misunderstandings
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Thinking beyond reasonable doubt is a percentage, such as 99% or 95%. It is not a number — courts deliberately refuse to quantify it, and figures circulating online have no legal basis.
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Believing the accused has to prove they are innocent. They do not. The prosecution must prove guilt, and the accused is presumed innocent.
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Thinking it means proof beyond all possible doubt, or 100% certainty. It does not — a fanciful or imaginary doubt is not a reasonable one.
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Assuming every single fact must be proved beyond reasonable doubt. Only the elements of the offence (and any indispensable link in the chain to guilt) must be.
Glossary of terms
Standard of proof
How convinced the court has to be before it can decide a fact is proved. In criminal cases the standard is beyond reasonable doubt.
Burden (or onus) of proof
Who has to prove the case. In a criminal trial it is the prosecution, not the accused.
Presumption of innocence
The rule that a person charged with a crime is treated as innocent until the prosecution proves their guilt to the required standard.
Balance of probabilities
The lower, civil standard of proof — meaning more likely than not (more than 50%). It is not used to decide criminal guilt.
Element of an offence
One of the legal building blocks the prosecution must prove for a particular crime. Each element must be proved beyond reasonable doubt.
Reasonable doubt
A genuine, sensible doubt that a reasonable person would act on — not a fanciful, imaginary or far-fetched one.
Circumstantial evidence
Evidence that points to guilt indirectly. A person can be convicted on it, but only if guilt is the only rational inference from it.
Acquittal
A finding of not guilty. It means the prosecution did not prove the case to the required standard.
Frequently asked questions
What does beyond reasonable doubt mean?
It is the highest standard of proof in Australian law. To convict, the prosecution must prove the accused person’s guilt so that no reasonable doubt remains. It is close to certainty, but it is not proof beyond every possible doubt, and it is not a percentage.
Is beyond reasonable doubt a percentage, like 99%?
No. This is the most common myth. Australian courts deliberately refuse to express the standard as a number, and any ‘90%’, ‘95%’ or ‘99%’ figure you see online has no legal basis. The court simply has to be sure of guilt, with no reasonable doubt left.
What is the difference between beyond reasonable doubt and the balance of probabilities?
Beyond reasonable doubt is the criminal standard — near certainty. The balance of probabilities is the civil standard, meaning simply more likely than not (more than 50%). Criminal cases use the high standard; civil cases (money, contracts, negligence, family law) use the lower one.
Who has to prove guilt in a criminal case?
The prosecution. It carries the burden of proving every element of the offence beyond reasonable doubt. The accused is presumed innocent and generally does not have to prove anything.
Does the accused have to prove their innocence?
No. A person charged with a crime never has to prove they are innocent. They are presumed innocent, and it is for the prosecution to prove guilt. If the prosecution cannot remove every reasonable doubt, the accused must be found not guilty.
Does beyond reasonable doubt mean 100% certain?
No. The law accepts that it is almost impossible to prove anything about a past event with absolute certainty. The standard is not proof beyond all doubt — it is proof that leaves no reasonable doubt. A fanciful or imaginary doubt does not count.
What is a reasonable doubt?
A reasonable doubt is a genuine, sensible doubt about guilt — the kind of doubt a reasonable person would act on. It is not a vague unease, and it is not a fanciful or far-fetched possibility. If a reasonable doubt remains, the accused must be acquitted.
Why won’t the judge tell the jury what reasonable doubt means?
Because the High Court has said the words are ordinary English that jurors understand, and that trying to define them tends to confuse rather than help (Green v The Queen; La Fontaine v The Queen). Victoria is an exception: there, a judge may explain the phrase if the jury asks.
What happens if the jury has a reasonable doubt?
The accused must be found not guilty. If, on the whole of the evidence, a reasonable doubt about guilt remains, the law requires that the doubt be resolved in the accused’s favour and a verdict of not guilty be returned.
Does every fact have to be proved beyond reasonable doubt?
No — only each legal element of the offence. The prosecution does not have to prove every individual fact to that standard, although any fact that is an indispensable link in the chain of reasoning towards guilt must itself be proved beyond reasonable doubt (Shepherd v The Queen).
Can someone be convicted on circumstantial evidence alone?
Yes, but only if the circumstantial evidence proves guilt beyond reasonable doubt. That means guilt must be the only rational inference from the evidence, and the circumstances must exclude any reasonable explanation consistent with innocence.
Is the standard of proof the same in every Australian state?
Yes, the standard itself — beyond reasonable doubt — is the same everywhere. The main difference is that in most states judges do not explain the phrase, while in Victoria a judge may explain it to the jury on request under the Jury Directions Act 2015.
Does ‘not guilty’ mean the person is innocent?
Not exactly. A not-guilty verdict means the prosecution did not prove the case beyond reasonable doubt. It is a finding that guilt was not established to the required standard, rather than a positive declaration that the person did not do it.
Is Legal Hotline a law firm?
No. Legal Hotline is a free 24/7 service that gives clear legal information — not legal advice — and can connect you with a vetted criminal lawyer if you need representation. Calling 1800 951 176 costs nothing and is confidential.
Sources & further reading
Last reviewed: 2026-06-19. The law changes and every case turns on its own facts — confirm current details with the linked official sources or call 1800 951 176.
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