OPINION
M. SMITH, Circuit Judge:
We consider in this disposition whether, when a common-fund settlement agreement has been reached in a class action and fees have been awarded to class counsel, a non-participating class member who objects only to the fee award has standing to appeal the denial of his own request for fees. We also consider a cross-appeal concerning the district court’s reduction of Plaintiffs’ attorney’s fees and costs. We vacate and remand.
FACTS AND PRIOR PROCEEDINGS
This case is before us for the third time. Plaintiffs Stetson et al. first appealed the district court’s order dismissing their complaint in May 2008. After oral argument, we referred the case to mediation. A settlement was reached, and we' remanded the case to the district court “for the limited purpose of considering approval of and approving the settlement agreement between the putative Class and Defendants.” The district court rejected the proposed settlement, and we reasserted jurisdiction. We then reversed the district court’s order of dismissal (the order from which the appeal had originally been taken) but again referred the case to mediation. By February 2013, a new settlement had been reached, and we issued our mandate, returning jurisdiction to the district court.
. The parties presented the new settlement agreement — which included a $9.5 million gross settlement fund — to the district court for approval. Plaintiffs’ attorneys (Class Counsel) sought $1.9 million in fees as compensation, which represented approximately 20 percent of the common fund. Class Counsel also sought $49,934.89 in costs. Certain class members (Objectors) objected to the fee request (but not to the underlying settlement), asserting 'that Class Counsel were entitled to no more than $380,000 in fees. Objectors then sought 20 percent of any reduction in Class Counsel’s fees as their own fee award, as well as $1,000 in incentive awards for each individual objector.
The district court granted $585,000 in fees to Class Counsel, which reflected a reduction of requested fees of approximately 70 percent. It also reduced Class Counsel’s costs reimbursement to $20,588.17. The district court announced its reasoning from the bench, as follows:
The Court finds that the lodestar method is preferable in the circumstances of this case.
In re Bluetooth Headset Prods. Litig.,
654 F.3d 935 (9th Cir.2011).
Using the lodestar method, the Court first determines the reasonable fee by multiplying the reasonable hourly rate by the reasonable hours expended in the litigation. Here, class counsel has provided a declaration with the schedule of hourly rates charged by each attorney who worked on the matter and how many hours were expended by those attorneys. After review of the time-sheet submissions and declarations of counsel, the Court finds that the hourly fee and hours expended are not reasonable.
First, the hourly fee charged by counsel is beyond the prevalent market rate. The Court finds that a reasonable hourly fee for an attorney with the experience of class counsel dealing with a case of this magnitude and degree of difficulty in the Central District is $450 per hour.
See Trevino v. Gates,
99 F.3d 911 (9th Cir.1996).
Second, the Court finds that many of the hours billed by class counsel were redundant, excessive, or otherwise unnec
essary.
Hensley v. Eckerhart,
461 U.S. 424, 103 S.Ct. 1933, 76 L.Ed.2d 40 (1983).
For instance, Class Counsel Disner’s time sheet does not separate and describe the time and tasks performed by each attorney; indeed, it appears that on many entries two attorneys billed for the same work. In sum, the Court finds that class counsel’s reasonable fee is $585,000. This is using the $450 per hour rate applied .across all counsel and to the total 1300 hours reasonably spent on this case.
Further, taking account of class counsel’s experience, skill in litigating this case, the complexity of the issues involved, and the customary fees charged by counsel in similar cases, the Court finds that the lodestar fee is reasonable and, on balance, the
Kerr
factors do not justify an upward or downward adjustment.
Kerr v. Screen Extras Guild, Inc.,
526 F.2d 67 (9th Cir.1975).
The district court also found that Class Counsel “inadequately supported its claim for expert fees; specifically, with the exception of Mr. Rook, class counsel has not provided the Court with information regarding how crucial or indispensable the unnamed experts were to the litigation.” Finally, the district court denied Objectors’ fee request in its entirety, finding that Objectors’, role was not “even minimally material in bringing about the successful settlement” because Objectors “did not add anything to the Court’s independent analysis.”
Both Plaintiffs and Objectors appealed.
DISCUSSION
We review an award of attorney’s fees for abuse of discretion.
Stanger v. China Elec. Motor, Inc.,
812 F.3d 734, 739 (9th Cir.2016). A district court abuses its discretion when it applies an incorrect rule of decision, or when it applies the correct rule to factual conclusions that are “illogical, implausible, or without support in the record.” .
Rodriguez v. Disner (Rodriguez II),
688 F.3d 645, 653 (9th Cir.2012). Findings of fact are reviewed for clear error; conclusions of law are reviewed de novo.
Stanger,
812 F.3d at 738.
I. Objectors’ Standing to Appeal
.In a class action, an. objector need not establish standing to object to an award of attorney’s fees by the district court. The district court has “the authority and duty to pass upon the fairness of the attorneys’ fees . settlement independently of whether there was objection.”
Zucker v. Occidental Petroleum Corp.,
192 F.3d 1323, 1329 (9th Cir.1999). The objector therefore needs only a procedural vehicle with which to place his arguments before the district court, which is provided by Federal Rule of Civil Procedure 23(h)(2): “A class member, or a party from whom payment is sought, may object to the motion [for class counsel’s fees].”
If, however, an objector seeks to
appeal
an award of fees to class counsel, he “must independently satisfy Article III” — that is, he must demonstrate standing to appeal independent of his ability to object before the district court.
Knisley v. Network Assocs., Inc.,
312 F.3d 1123, 1126 n. 1 (9th Cir.2002). Where an objector has participated in the common-fund settlement, he has standing to appeal because a reduction in class counsel’s fees will likely increase his own award from the common fund;
Id)
at 1126; Even where an objector has not participated in the common fund settlement, he may still have standing to appeal the settlement: if he prevails, a better settlement might' be" obtained on remand in which he could participate’. Thus, his injury is .likely redressable on appeal.
Id.
By contrast, an objector who has refused to. participate in the common-
fund settlement and' who objects- only to class counsel’s fees generally will not have standing to appeal the fee award: Because he has not participated in the settlement, a reduction in class-counsel fees will not benefit him, and therefore (barring some unusual terms in the settlement agreement) he has no injury that is redressable.
Id.
at 1126-27.
Nevertheless, an objector has standing to appeal a denial of his
own
claim for. fees. If the district court reduces class counsel’s fees but denies fees to the objector, that denial creates a particularized injury to the objector that can be redressed on appeal., A particularized, redressable injury of that sort is sufficient to confer standing.
Knisley,
312 F.3d at 1126-27. Thus we concluded in
Rodriguez II
that even if an objector does not submit a settlement claim, he nevertheless has standing to appeal the denial of his reguest for fees because “an attorney who confers a benefit on the class is entitled to fees based on equitable principles of unjust enrichment, and has standing to challenge the denial of such fees, regardless whether the attorney’s client will receive any of the savings.” 688 F.3d at 660 n. 11.
Here, Class Counsel challenge Objectors’ standing to- appeal the denial of their petition for- fees. Objectors concede that they “did not file a claim to receive a share of the settlement proceeds.” However, their appeal does not concern the district court’s award- of fees to Class Counsel. They appeal only the district court’s denial of their own petition for fees, which is a particularized injury to the Objectors we can redress. Thus,
Knisley
is distinguishable, and as in
Rodriguez II,
Objectors have standing to appeal the .district court’s denial of their petition for fees.
Class Counsel also assert that Objectors’ objection was untimely. All agree that Objectors filed their objection on July 29,2013. The district court’s order setting forth the relevant deadlines is ambiguous. In one paragraph, the order provides that a putative objector, “no later than twenty-one days before the August 19, 2013, Final Séttleiment Hearing
(presently,' July 29,
2013), must file a written notice of intention to object” (emphasis added). Elsewhere, however, it provides that “[a]ll Claim Forms,
objections,
and exclusion requests, if submitted by Class Members' via U.S. mail, must be postmarked no later than July 8, 2013; all Claim Forms, if submitted online, must be submitted no later than
July 8, 2013”
(emphases added). Adding to the confusion, the Settlement Agreement approved by the district court provides that objections must be lodged “no later than twenty-one (21) days before the Final Settlement hearing”— which corresponds with the July 29 date. All relevant' documents were drafted by Class Counsel. Thus, in accordance with the general principle of
contra proferen-tem,
we cónstrue the ambiguity against them.
See generally, e.g., United States v. Transfiguracion,
442 F.3d 1222, 1228 (9th Cir.2006) (plea agreement);
In re Kahan,
28 F.3d 79, 82 (9th Cir.1994) (bankruptcy schedules). Objectors’ objection is deemed timely. "
However, to be entitled to funds, an objector must “increase the fund or otherwise substantially benefit the class members.”
Vizcaino v. Microsoft Corp.,
290 F.3d 1043, 1051 (9th Cir.2002);
see also Rodriguez II,
688 F.3d at 658. In Part II,
infra,
we vacate and remand the district court’s decision reducing Class Counsel’s fees. Objectors are therefore not
yet
entitled to attorney’s fees. On remand, if the district court again reduces Class Counsel’s fee award, it can also determine—with specificity—the extent to which Objectors’ arguments influenced its decision. For now, therefore, we vacate
and remand the district court’s decision concerning Objectors’ entitlement to fees.
II. Class Counsel’s Petition for Fees and Costs
“In class action litigation, a district court ‘may award reasonable attorney’s fees and nontaxable costs that are authorized by-law or by the parties’ agreement.’ ”
Rodriguez v. Disner (Rodriguez
II), 688 F.3d 645, 653 (9th Cir.2012) (quoting Fed. R. Civ. P. 23(h)). In the absence of a contractual or statutory basis for awarding fees, the district court may award reasonable fees as a matter of federal common law when -class counsel .has recovered a “common fund.”
Id.
(citing
Boeing Co. v. Van Gemert,
444 U.S. 472, 478, 100 S.Ct. 745, 62 L.Ed.2d 676 (1980)). A “common fund” exists when “each member of a certified class has an undisputed and mathematically ascertainable claim to part of a lump-sum judgment recovered on his behalf.”
Boeing Co.,
444 U.S. at 479, 100 S.Ct. 745. Fees awarded out of the common fund are thus apportioned among the class. It is not disputed that this is a common-fund case.
To calculate the fee in a com-mqn-fund case, the district court “has discretion to apply either the lodestar method or the percentage-of-the-fund method in calculating a fee award.”
Fischel v. Equitable Life Assurance Soc’y,
307 F.3d 997, 1006 (9th Cir.2002). Under the former method, the district court “multiplies a reasonable number of hours by a reasonable hourly rate”; under the latter method, the “benchmark” award is 25 percent of the fund, which the district court may “adjust[] upward or downward, to account for any unusual circumstances involved in the case.”
Id.
(quotation marks and alteration omitted). There is a strong presumption that the lodestar is a reasonable fee.
Id.
at 1007. In general “the choice to apply the lodestar method, rather than the percentage-of-fund method, [is] well within the district court’s discretion.”
Stanger v. China Elec. Motor, Inc.,
812 F.3d 734, 739 (9th Cir.2016).
Stanger
was also a class action involving a common-fund, settlement, and it was an appeal from the same district judge that decided this case. In
Stanger,
the district judge drastically, reduced class counsel’s fees with only minimal reasoning and analysis.
Id.
at 739. We explained that
[i]n order for this Court to conduct a meaningful review/of the fee award’s reasonableness — the district court must “provide a concise but clear explanation of its reasons for the fee award.” The district court must state not only the grounds on which it relied, but also how .it weighed the various .competing considerations____ Especially “where the disparity between the requested fee and the final award is larger, a more specific articulation of the court’s reasoning is expected.” . . ;
Id.
(quoting
Hensley v. Eckerhart,
461 U.S. 424, 437, 103 S.Ct. 1933, 76 L.Ed.2d 40 (1983);
Moreno v. City of Sacramento,
534 F.3d 1106, 1111 (9th Cir.2008)) (citations and alteration omitted). We therefore held that we had “no choice” but to vacate and remand.
Id.
at 740 (quotation marks omitted). Because the district court’s decision was materially similar to the situation here,
Stanger
largely controls the outcome of Class Counsel’s appeal of their fee and costs award in this case.
A. Fees
The district court used the lodestar method to' calculate fees, and it acted well within its ■ discretion to do so.
See Stanger,
812 F.3d at 739;
Fischel,
307 F.3d at 1007. But. the disparity between the requested fees ($1.9 million) and the awarded fees ($585,000)' is- $1,315,000 — a nearly 70 percent reduction from the re
quested fees and a 36 percent reduction from Class ■ Counsel’s computed .lodestar fee. Such a large disparity requires a relatively specific articulation of the court’s reasoning.
Stanger,
812 F.3d at 739 (requiring á more specific articulation for a 30 percent reduction in hours);
Costa v. Comm’r of Soc. Sec. Admin.,
690 F.3d 1132, 1136-37 (9th Cir.2012) (similar);
Moreno v. City of Sacramento,
534 F.3d 1106, 1111—13 (9th Cir.2008) (similar). Failure to do so is an abuse of discretion.
See Stanger,
812 F.3d at 739. There are a number of areas in which the'district court here should have been more specific as to its reasoning.
l: Hours.
The district court reduced Class' Counsel’s' declared time expended by 241.2 hours, asserting that “many of the hours billed ... were redundant, excessive, or otherwise unnecessary.” As in
Stanger,
“[w]hile the court noted one or two considerations that might have supported its decision, it failed to explain how it weighed those considerations when calculating the final award.” 812 F.3d at 739. Specifically, the court provided no explanation for why it reduced the lodestar by 241.2 hours, “as opposed to any other number of hours.”
See id.
On remand, the district court should take into account the reality that some amount of duplicative work is “inherent in the process of litigating pver time.”
Moreno,
534 F.3d at 1112.
2. Hourly' fee.
As in
Stan-ger,
the district court’s declaration that a reasonable hourly fee for Class Counsel is $450 per hour “gives us no clue on whether it relied on Class Counsel’s current or historic rates.” 812 F.3d at 740. The district court provided no reasoning other than an offhand eitation to
Trevino v. Gates,
99 F.3d 911 (9th Cir.1996). To the extent that the district court relied on the evidence in
Trevino
that “the reasonable hourly rate in- the- community for experienced private attorneys handling complex litigation ranged from $250 to $550/hour,”
id.
at 924, relying on a 1996 case to determine prevailing hourly rates in 2013 was clear error.
See Fischel,
307 F.3d at 1010;
Moreno,
534 F.3d at 1115. The lodestar should be computed either using an hourly rate that reflects the- prevailing rate as of the date of the fee request, to compensate class counsel- for delays in payment inherent in contingency-fee cases, or using historical rates and compensating for delays with a prime-rate enhancement.
Stanger,
812 F.3d at 740;
Fischel,
307 F.3d at 1010. The district court’s failure to do either (or to explain what it was doing) was also an abuse of discretion.
3. Risk multiplier.
“The district court
must
apply a risk multiplier to the lodestar ‘when (1) attorneys take a ease with the expectation they will receive a risk enhancement if they prevail, (2) their hourly rate does not reflect that risk, and (3) there is evidence the case was risky,’ Failure to apply a risk multiplier in cases that meet these criteria is an abuse of discretion.”
Stanger,
812 F.3d at 741 (quoting
Fischel,
307 F.3d at 1008) (emphasis added). Here, there is some evidence of risk — after all, the district court initially dismissed the- case’ before being reversed on appeal — but the record is not developed on the extent of that risk, or on the other two elements. The district court' failed entirely to consider whether Class Counsel’s representation merited a risk multiplier. On remand, the decision to apply a risk multiplier — or hot — remains within the district court’s discretion, but in either event it “must fully and adequately explain the basis for its decision.”
Stanger,
812 F.3d at 741.
f Kerr
factors.. The district court also has discretion to adjust the lodestar upward or downward using a multiplier that' reflects “a host of ‘reasonableness’ factors, including the quality of represen
tation, the benefit obtained for the class, the complexity and novelty of the issues presented, and the risk of nonpayment.”
In re Bluetooth Headset Prods. Liab. Litig.,
654 F.3d 935, 941-42 (9th Cir.2011) (quotation marks omitted). These factors are known as the
Kerr
factors.
See Kerr v. Screen Extras Guild, Inc.,
526 F.2d 67, 70, (9th Cir.1975),
abrogated on other grounds by City of Burlington v. Dague,
505 U.S. 557, 112 S.Ct. 2638, 120 L.Ed.2d 449 (1992). Class Counsel provided a' detailed analysis of these factors on pages 16-21 of their motion for attorney’s fees; the district court briefly mentioned the factors and then, without any analysis, dismissed them. On remand, the court “must explicitly discuss why the
Kerr
reasonableness factors do or do not favor applying a multiplier (positive or negative) in this case.”
See Stanger,
812 F.3d at 740.
B. Costs
The district court found that Class Counsel had “inadequately supported its claim for expert fees.” Specifically, the court found, “with the exception of Mr. Rook, class counsel has not provided the Court with information regarding'how crucial or indispensable the unnamed experts were to the litigation.” In a declaration submitted to the district court on August 12, 2013, however/.'Class Counsel named two other experts — Dr. Safir and Dr. Gi-kas — and explained that they were consulted on “the range of possible damages and the various ways -in- which settlement might be achieved.” Class Counsel provided almost two full pages explaining how these experts were . used and. why, their input was crucial or indispensable. The district court’s reduction - of Class Counsel’s costs was therefore based on clearly erroneous findings of fact.
Thus, for all the foregoing reasons, the district court’s award of costs and fees to Class Counsel is vacated as arbitrary and remanded for further consideration. On remand, the district court should (1) clearly provide reasons for the factors in its lodestar computation; (2). expressly consider both a risk, multiplier and the
Kerr
factors; and (3) base its decision on facts supported by the record.
CONCLUSION
As we previously observed, this case is before us for the third time. Moreover, in a related matter before the same district judge, decimations and denials of attorneys fees have been appealed three times, and each time we have reversed the district court, at least in part.
See Rodriguez v. W. Publ’g Corp. (Rodriguez III),
602 Fed.Appx. 385, 387 (9th Cir.2015);
Rodriguez II,
688 F.3d at 660;
Rodriguez v. W. Publ’g Corp. (Rodriguez I),
563 F.3d 948, 969 (9th Cir.2009). In addition, we have already .mentioned the similarity of the district judge’s decision in
Stanger
to his reasoning in this case!
In light of the history of this case and related litigation, it is clear to us that the district judge would have “substantial difficulty in putting out of his ... .mind” his previously .expressed,, erroneous. findings and conclusions, and that “reassignment is advisable to preserve the appearance of justice.”
See United States v. Atondo-Santos,
385 F.3d 1199, 1201 (9th Cir.2004) (quotation marks omitted). Accordingly, exercising our supervisory powers under 28 U.S.C. § 2106, the award of attorney’s fees and costs to Class Counsel and the denial.of attorney’s fees to Objectors are VACATED and REMANDED with direction that the case be reassigned to a different 'district judge. Each party shall bear its own costs on appeal.